Re: [Neo4j] Can not recover from a HA failure as a BlockingReadTimeoutException

[Peter Neubauer]

Samuel,
is it possible for you to update to 1.7 and rerun your test, so we can
better recreate it?

Cheers,

/peter neubauer

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If you can sketch, you can use a graph database - @neo4j


On Tue, May 15, 2012 at 10:23 AM, Samuel Feng  wrote:
> Dear List,
>
> I am using 1.6.1 and embedded HA mode.
>
> Do u have any ideas that how to resolve below error?
>
> =2012-05-15 16:07:10,453 main ERROR - [ServletCntxListener.moreStart]
> Failed in start the graph
> java.lang.ExceptionInInitializerError
>        at com.hlt.neo.CountryFactory.(CountryFactory.java:60)
>        at com.hlt.neo.CountryFactory.(CountryFactory.java:49)
>        at
> com.hlt.online.ServletCntxListener.moreStart(ServletCntxListener.java:44)
>        at
> com.gr.online.servlet.InitServletCntxListener.contextInitialized(InitServletCntxListener.java:44)
>        at
> org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4205)
>        at
> org.apache.catalina.core.StandardContext.start(StandardContext.java:4704)
>        at
> org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
>        at
> org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
>        at
> org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
>        at
> org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
>        at
> org.apache.catalina.core.StandardService.start(StandardService.java:525)
>        at
> org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
>        at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>        at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>        at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>        at java.lang.reflect.Method.invoke(Method.java:597)
>        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
>        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
> Caused by: java.lang.RuntimeException: Tried to join the cluster, but was
> unable to
>        at org.neo4j.kernel.HAGraphDb.startUp(HAGraphDb.java:297)
>        at org.neo4j.kernel.HAGraphDb.(HAGraphDb.java:167)
>        at org.neo4j.kernel.HAGraphDb.(HAGraphDb.java:131)
>        at
> org.neo4j.kernel.HighlyAvailableGraphDatabase.(HighlyAvailableGraphDatabase.java:55)
>        at com.gr.neo.Graph.init(Graph.java:64)
>        at com.gr.neo.Graph.(Graph.java:45)
>        at com.gr.neo.Graph.(Graph.java:42)
>        ... 19 more
> Caused by: java.lang.RuntimeException: Gave up trying to copy store from
> master
>        at
> org.neo4j.kernel.HAGraphDb.getFreshDatabaseFromMaster(HAGraphDb.java:237)
>        at org.neo4j.kernel.HAGraphDb.startUp(HAGraphDb.java:273)
>        ... 25 more
> Caused by: org.neo4j.com.ComException:
> org.jboss.netty.handler.queue.BlockingReadTimeoutException
>        at
> org.neo4j.com.DechunkingChannelBuffer.readNext(DechunkingChannelBuffer.java:75)
>        at
> org.neo4j.com.DechunkingChannelBuffer.readNextChunk(DechunkingChannelBuffer.java:93)
>        at
> org.neo4j.com.DechunkingChannelBuffer.(DechunkingChannelBuffer.java:59)
>        at org.neo4j.com.Client.sendRequest(Client.java:210)
>        at org.neo4j.com.Client.sendRequest(Client.java:185)
>        at org.neo4j.kernel.ha.MasterClient.copyStore(MasterClient.java:268)
>        at
> org.neo4j.kernel.HAGraphDb.copyStoreFromMaster(HAGraphDb.java:425)
>        at
> org.neo4j.kernel.HAGraphDb.getFreshDatabaseFromMaster(HAGraphDb.java:224)
>        ... 26 more
> Caused by: org.jboss.netty.handler.queue.BlockingReadTimeoutException
>        at
> org.jboss.netty.handler.queue.BlockingReadHandler.readEvent(BlockingReadHandler.java:236)
>        at
> org.jboss.netty.handler.queue.BlockingReadHandler.read(BlockingReadHandler.java:167)
>        at
> org.neo4j.com.DechunkingChannelBuffer.readNext(DechunkingChannelBuffer.java:66)
>        ... 33 more
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Re: [Neo4j] Neo4j as a service on Fedora 16

[Peter Neubauer]

Georg,
I have no knowledge of Fedora - seems to be a problem in the system
setup rather than neo4j. You are rebooting once and can't start the
server, then rebooting again and it works?

Cheers,

/peter neubauer

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If you can write, you can code - @coderdojomalmo
If you can sketch, you can use a graph database - @neo4j



On Wed, Apr 18, 2012 at 10:32 AM, Georg Summer  wrote:
> Hi everyone,
>
> I want to have neo4j standalone server running as a service on a Fedora 16 VM.
> I can start the server without any problems from the cmdline (/bin/neo4j 
> start)
>
> The neo4j install obviously does not work because it uses update-rc.d
> with is a Debian thing. So I replaced it with the Fedora equivalent:
> chkconfig --add ${SERVICE_NAME}
> The service gets installed and written into /etc/rc.d/init.d and
> /etc/rc.d/rcX.d. (written into as in symbolic link to the neo4j
> object)
> using chkconfig I can see that the service is registered to be ON on
> runlevel 3-5.
> I can also start it from there (including through systemd: sudo
> systemctl start neo4j-service.service)
>
> When I reboot the machine though nothing happens. The server is not
> started and there is nothing written into the
> $NEO4J_HOME/data/log/*.log messages. Also nothing pops up in
> /var/log/messages or /var/log/boot.log or dmesg.
> After the reboot I can without any problems start the server again.
>
> Am I missing something obvious here?
>
> best regards,
>
> Georg
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Re: [Neo4j] large graph visualizations/analytics

[Peter Neubauer]

Ajinkya,
just talked to one of the Gephi guys,

"2.3M nodes and 60M edges...you should buy another computer with
at least 60GB of RAM for Gephi."

Cheers,

/peter neubauer

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On Wed, Apr 11, 2012 at 10:17 AM, Ajinkya Kale  wrote:
> Hi, I am trying to load neo4j db in Gephi on a 64-bit windows system with
> 6GB RAM running a 64-bit jvm but it runs out of memory .. i tried to
> allocate more memory through the jvm parameters and ended up allocating the
> maximum possible without any luck.
> My graphdb is of the following dimensions :
>
> nodes 2320895
> type1 relationship edge 50655143
> type2 relationship edge 10632833
>
> Any suggestions on tools/techniques to visualize and run analytics on
> graphdbs of this scale ?
>
> --
>
> Regards,
> Ajinkya
> http://ajinkya.info
>
> .O.
> ..O
> OOO
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Re: [Neo4j] large graph visualizations/analytics

[Peter Neubauer]

Mmh,
have you tried GraphViz? It's not interactive but might be up to the
task, having possibly less overhead than Gephi ...

Cheers,

/peter neubauer

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On Wed, Apr 11, 2012 at 10:17 AM, Ajinkya Kale  wrote:
> Hi, I am trying to load neo4j db in Gephi on a 64-bit windows system with
> 6GB RAM running a 64-bit jvm but it runs out of memory .. i tried to
> allocate more memory through the jvm parameters and ended up allocating the
> maximum possible without any luck.
> My graphdb is of the following dimensions :
>
> nodes 2320895
> type1 relationship edge 50655143
> type2 relationship edge 10632833
>
> Any suggestions on tools/techniques to visualize and run analytics on
> graphdbs of this scale ?
>
> --
>
> Regards,
> Ajinkya
> http://ajinkya.info
>
> .O.
> ..O
> OOO
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Re: [Neo4j] HA - Unable to read additional data from server sessionid 0x0

[Peter Neubauer]

Nice,
glad it worked out!

Cheers,

/peter neubauer

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Neo4j 1.6 released                 - dzone.com/6S4K
The Neo4j Heroku Challenge   - http://neo4j-challenge.herokuapp.com/



On Wed, Mar 14, 2012 at 4:25 PM, Samuel Feng  wrote:
> Thanks a lot, Peter.
>
> I found another way to bring it up again,
>
> As I thought there should be some incorrect status stored in the graph,
> maybe start up the master instance in Non-HA mode can rectify the status. I
> tried and that works. Now the HA cluster is running normally.
>
> However, to prevent it happen again, I will setup a 3-node zk cluster.
> Thanks a lot~
>
> Thanks and Regards,
>
> Samuel
>
> 2012/3/14 Peter Neubauer 
>
>> Hi there,
>> I talked to Chris Gioran and got the following diagnostics:
>>
>> "This* is
>> what happens when in a quorum of 2 ZK instances one goes down.
>>
>> (*this == the remaining ZK instance - which is not in standalone mode
>> - will refuse to accept requests, hence the ZooClient in neo will barf
>> and die).
>>
>> Reproduced it in exactly the same manner: started a 2 ZK quorum and 2
>> neo instances using it, brought down one of the zk servers and
>> restarted one neo instance - it refused to come online again. If that
>> is what you did, then that is what happened."
>>
>> To bring it up again, I think you need to get a 3 - node ZK cluster up
>> and running again before it will accept new cluster nodes again.
>>
>> Cheers,
>>
>> /peter neubauer
>>
>> G:  neubauer.peter
>> S:  peter.neubauer
>> P:  +46 704 106975
>> L:   http://www.linkedin.com/in/neubauer
>> T:   @peterneubauer
>>
>> Neo4j 1.6 released                 - dzone.com/6S4K
>> The Neo4j Heroku Challenge   - http://neo4j-challenge.herokuapp.com/
>>
>>
>>
>> On Mon, Mar 12, 2012 at 2:00 PM, Samuel Feng  wrote:
>> > Dear List,
>> >
>> > I am using neo4j 1.6.1 and embedded HA Mode.
>> >
>> > The cluster(with 2 servers) works normally at the beginning. However,
>> after
>> > one server crashed, the cluster can not start up and keep return below
>> > logs. Seems both of the two servers are trying to connect each other but
>> > failed again again.
>> >
>> > I tried to remove the version-2 folder to reset the cluster. But the
>> > problem exits. Could you please help me how to recover the cluster?
>> Thanks
>> > a lot
>> >
>> > =2012-03-12 20:58:45,946 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.startConnect] Opening socket connection to server
>> > 125.65.108.23/125.65.108.23:2181
>> > =2012-03-12 20:58:45,947 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.primeConnection] Socket connection established to
>> > 125.65.108.23/125.65.108.23:2181, initiating session
>> > =2012-03-12 20:58:45,950 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.run] Unable to read additional data from server
>> > sessionid 0x0, likely server has closed socket, closing socket connection
>> > and attempting reconnect
>> > =2012-03-12 20:58:46,066 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.startConnect] Opening socket connection to server
>> > 125.65.108.23/125.65.108.23:2181
>> > =2012-03-12 20:58:46,067 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.primeConnection] Socket connection established to
>> > 125.65.108.23/125.65.108.23:2181, initiating session
>> > =2012-03-12 20:58:46,068 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.run] Unable to read additional data from server
>> > sessionid 0x0, likely server has closed socket, closing socket connection
>> > and attempting reconnect
>> > =2012-03-12 20:58:46,153 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.startConnect] Opening socket connection to server
>> > 125.65.108.89/125.65.108.89:2181
>> > =2012-03-12 20:58:46,157 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.primeConnection] Socket connection established to
>> > 125.65.108.89/125.65.108.89:2181, initiating session
>> > =2012-03-12 20:58:46,160 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.run] Unable to read additional data from server
>> > sessionid 0x0, likely server has closed socket, closing soc

Re: [Neo4j] HA - Unable to read additional data from server sessionid 0x0

[Peter Neubauer]

Hi there,
I talked to Chris Gioran and got the following diagnostics:

"This* is
what happens when in a quorum of 2 ZK instances one goes down.

(*this == the remaining ZK instance - which is not in standalone mode
- will refuse to accept requests, hence the ZooClient in neo will barf
and die).

Reproduced it in exactly the same manner: started a 2 ZK quorum and 2
neo instances using it, brought down one of the zk servers and
restarted one neo instance - it refused to come online again. If that
is what you did, then that is what happened."

To bring it up again, I think you need to get a 3 - node ZK cluster up
and running again before it will accept new cluster nodes again.

Cheers,

/peter neubauer

G:  neubauer.peter
S:  peter.neubauer
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Neo4j 1.6 released                 - dzone.com/6S4K
The Neo4j Heroku Challenge   - http://neo4j-challenge.herokuapp.com/



On Mon, Mar 12, 2012 at 2:00 PM, Samuel Feng  wrote:
> Dear List,
>
> I am using neo4j 1.6.1 and embedded HA Mode.
>
> The cluster(with 2 servers) works normally at the beginning. However, after
> one server crashed, the cluster can not start up and keep return below
> logs. Seems both of the two servers are trying to connect each other but
> failed again again.
>
> I tried to remove the version-2 folder to reset the cluster. But the
> problem exits. Could you please help me how to recover the cluster? Thanks
> a lot
>
> =2012-03-12 20:58:45,946 main-SendThread(125.65.108.89:2181) INFO  -
> [ClientCnxn$SendThread.startConnect] Opening socket connection to server
> 125.65.108.23/125.65.108.23:2181
> =2012-03-12 20:58:45,947 main-SendThread(125.65.108.23:2181) INFO  -
> [ClientCnxn$SendThread.primeConnection] Socket connection established to
> 125.65.108.23/125.65.108.23:2181, initiating session
> =2012-03-12 20:58:45,950 main-SendThread(125.65.108.23:2181) INFO  -
> [ClientCnxn$SendThread.run] Unable to read additional data from server
> sessionid 0x0, likely server has closed socket, closing socket connection
> and attempting reconnect
> =2012-03-12 20:58:46,066 main-SendThread(125.65.108.89:2181) INFO  -
> [ClientCnxn$SendThread.startConnect] Opening socket connection to server
> 125.65.108.23/125.65.108.23:2181
> =2012-03-12 20:58:46,067 main-SendThread(125.65.108.23:2181) INFO  -
> [ClientCnxn$SendThread.primeConnection] Socket connection established to
> 125.65.108.23/125.65.108.23:2181, initiating session
> =2012-03-12 20:58:46,068 main-SendThread(125.65.108.23:2181) INFO  -
> [ClientCnxn$SendThread.run] Unable to read additional data from server
> sessionid 0x0, likely server has closed socket, closing socket connection
> and attempting reconnect
> =2012-03-12 20:58:46,153 main-SendThread(125.65.108.23:2181) INFO  -
> [ClientCnxn$SendThread.startConnect] Opening socket connection to server
> 125.65.108.89/125.65.108.89:2181
> =2012-03-12 20:58:46,157 main-SendThread(125.65.108.89:2181) INFO  -
> [ClientCnxn$SendThread.primeConnection] Socket connection established to
> 125.65.108.89/125.65.108.89:2181, initiating session
> =2012-03-12 20:58:46,160 main-SendThread(125.65.108.89:2181) INFO  -
> [ClientCnxn$SendThread.run] Unable to read additional data from server
> sessionid 0x0, likely server has closed socket, closing socket connection
> and attempting reconnect
> =2012-03-12 20:58:46,802 main-SendThread(125.65.108.23:2181) INFO  -
> [ClientCnxn$SendThread.startConnect] Opening socket connection to server
> 125.65.108.89/125.65.108.89:2181
> =2012-03-12 20:58:46,806 main-SendThread(125.65.108.89:2181) INFO  -
> [ClientCnxn$SendThread.primeConnection] Socket connection established to
> 125.65.108.89/125.65.108.89:2181, initiating session
> =2012-03-12 20:58:46,812 main-SendThread(125.65.108.89:2181) INFO  -
> [ClientCnxn$SendThread.run] Unable to read additional data from server
> sessionid 0x0, likely server has closed socket, closing socket connection
> and attempting reconnect
>
> Thanks a lot,
>
> Samuel
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Re: [Neo4j] Anything like a changes feed?

[Peter Neubauer]

http://docs.neo4j.org/chunked/snapshot/transactions-events.html

Could that be interesting?

Send from a device with crappy keyboard and autocorrection.

/peter
On Feb 21, 2012 6:17 PM, "Johnny Luu"  wrote:

> That would be a great feature. Reminds me about CouchDB's changes
> notification.
>
> Johnny
>
> On Tue, Feb 21, 2012 at 5:27 PM, Nolan Darilek  >wrote:
>
> > I'm specing out an app that looks like a great fit for a graph database,
> > and this is the first time I'm considering using raw Neo4J (I.e. not
> > using the spatial layer.) A big part of this app involves actively
> > engaging users. So if their user node becomes connected to a new task
> > node, for instance, they are instantly notified that new tasks are
> > available for them.
> >
> > Is it possible to create a listener that automatically monitors an
> > embedded database for changes--new relationships created, relationships
> > removed, etc.? I can probably do this out-of-band with a separate
> > component, but it'd be awesome if I could do this closer to the database.
> >
> > Thanks!
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Re: [Neo4j] Accessing node properties with batch inserter

[Peter Neubauer]

Yes, That sounds right. Could you please file an issue?

Send from a device with crappy keyboard and autocorrection.

/peter
On Feb 17, 2012 4:22 PM, "Paul Jackson"  wrote:

> Hi Peter,
>
> I shouldn't have added that code. I added it as a test to see if that was
> the problem. This code does not delete nor use transactions, yet the
> properties returned are empty. I guess I am using it wrong?
>
> BatchInserter batchInserter = new BatchInserterImpl(storeDir);
> GraphDatabaseService graph = batchInserter.getGraphDbService();
> Node node = graph.createNode();
> long id = node.getId();
> node.setProperty("MyKey", "MyValue");
> Map properties = batchInserter.getNodeProperties(id);
>
> Intuition says it should remember the property was added. Bug or user
> error?
>
> Thanks,
> -Paul
>
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Re: [Neo4j] Accessing node properties with batch inserter

[Peter Neubauer]

Paul,
that GDB instance you get is NOT supporting deletions or transactions
(it does just ignore them) it's more for reading stuff. See the
JavaDoc for the method:

/**
 *
 * @return a GraphDatabaseService that does not support deletion
and transactions
 */
public GraphDatabaseService getGraphDbService();

When having a Batchinserter open, please do all modifications via it ...

Cheers,

/peter neubauer

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On Tue, Feb 14, 2012 at 10:33 PM, Paul A. Jackson  wrote:
> Just started using the batch inserter and I think I am missing a basic 
> concept.
>
> This code snippet using Neo 1.5 returns a zero-length map. I would expect it 
> to have a single property (MyKey).
>
>    String storeDir = "./neodb";
>    deleteDirectory(new File(storeDir));
>    BatchInserter batchInserter = new BatchInserterImpl(storeDir);
>    GraphDatabaseService graph = batchInserter.getGraphDbService();
>    Transaction transaction = graph.beginTx();
>    Node node = graph.createNode();
>    long id = node.getId();
>    node.setProperty("MyKey", "MyValue");
>    transaction.success();
>    transaction.finish();
>    Map properties = batchInserter.getNodeProperties(id);    // 
> properties is empty
>
> I added the Transaction stuff for testing, but was expecting that to not be 
> necessary as well.
>
> Thanks,
>
> Paul Jackson, Principal Software Engineer
> Pitney Bowes Software
> 4200 Parliament Place | Suite 600 | Lanham, MD  20706-1844  USA
> O: 301.918.0850 | M: 703.862.0120 | www.pb.com
> paul.jack...@pb.com
>
> Every connection is a new opportunityT
>
>
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Re: [Neo4j] How to limit Traverser

[Peter Neubauer]

Emil,
there are some good docs at
http://docs.neo4j.org/chunked/snapshot/tutorials-java-embedded-traversal.html#_new_traversal_frameworkthat
you can use.

In your case, you are stopping the traversal but not excluding the nodes
you find from being part of the result. It seems you are using the first
version of the Traversal framework, where there is not only a
StopEvaluator, but even a ReturnEvaluator that determines what to return.

Alternatively, have a look at Cypher (
http://docs.neo4j.org/chunked/snapshot/tutorials-cypher-java.html from
Java) with the LIMIT keyword, see
http://docs.neo4j.org/chunked/snapshot/query-limit.html)

HTH

Cheers,

/peter neubauer

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On Wed, Feb 8, 2012 at 10:58 AM, Emil Dombagolla <
em...@hsenidoutsourcing.com> wrote:

> Hi all,
>
> Please help me.
>
> I user Traverse API . I want to get node list from the database and that
> should be limited to 2 nodes.(similar Sql limit query). How can i stop
> the traverse when it found 2 nodes.
>
> i try something as follows but still returns all the nodes found.
>
> return getRefereneNode().getUnderlyingNode().traverse(Order.BREADTH_FIRST,
> new LimitEvaluator(),
>  ReturnableEvaluator.ALL_BUT_START_NODE, RelTypes.TEMP_EMAIL,
> Direction.OUTGOING);
>
> private class LimitEvaluator implements StopEvaluator{
>  @Override
> public boolean isStopNode(TraversalPosition currentPos) {
> return currentPos.returnedNodesCount()>=2;
> }
> }
> Please help on this.
> Thanks
> Emil Dombagolla,
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Re: [Neo4j] 1.5 question: auto indexes over REST API

[Peter Neubauer]

Aseem,
did you make sure you have enabled autoindexing,
http://docs.neo4j.org/chunked/snapshot/auto-indexing.html#auto-indexing-config?

I just added default config in the servers neo4j.properties files, it's the
same in 1.5, see
https://github.com/neo4j/packaging/commit/15a71269f10286f69031c0c939a8c324097a041ffor
the right keys.

Does that work?

Cheers,

/peter neubauer

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On Wed, Jan 25, 2012 at 9:04 PM, Aseem Kishore wrote:

> Hi guys,
>
> Sorry if I'm a bit behind the times here ;) -- we're just now upgrading to
> 1.5. (But awesome that 1.6 has been released! We can go ahead upgrade to it
> right after this.)
>
> We use exclusively the REST API. We were excited about auto-indexing in
> 1.4, so we used it over the REST API taking advantage of the implementation
> detail (?) that the index name was "node_auto_index".
>
> So e.g. we would query the auto index via:
>
> GET /db/data/index/node/*node_auto_index*/key/value
>
>
> This seems to still work after we upgrade to 1.5, which is good. But I'm
> looking through the 1.5 manual, and I saw this new section:
>
> http://docs.neo4j.org/chunked/1.5/rest-api-auto-indexes.html
>
>
> Which suggests this new syntax:
>
> GET http://localhost:7474/db/data/index/*auto*/node/key/value
>
>
> This seems to be new, but I can't find any issue on GitHub or any email
> about this. I also can't figure out how to use this myself -- as I query
> the REST API, I never get JSON that references this kind of URL. And if I
> try to query with this kind of URL myself, I always get a 404 or 400.
>
> What's the deal with this?
>
> Thanks!
>
> Aseem
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Re: [Neo4j] SpringDataNeo4j 2.0 & Supernode navigation

[Peter Neubauer]

Agelos,
supernode support for these cases will be handled below SDN. Mattias
has been spiking this in
https://github.com/neo4j/community/tree/super-node-support but we have
had no time to merge this in, since the QA on store changes is
non-trivial.

Cheers,

/peter neubauer

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On Thu, Jan 12, 2012 at 8:22 PM, Agelos Pikoulas
 wrote:
> Hello everyone, just watched Michael Hunger on the Spring Data Neo4j
> webinar - thanks Michael.
>
> Now to the question, its an old problem - the "supernode" relationship
> navigation:
>
> Assume a *Movie *node has N.000.000 incoming *LIKES *from *User *nodes, but
> only a few incoming *ACTS_IN *from *Actor* nodes.
>
> How would we navigate in SDN from *Movie *onto these *ACTS_IN *relationships
> & *Actor *nodes via an indexed relationship (eg
> IndexedRelationShipExpander), without stumping onto those 1M *LIKES
> *relationships
> that will put a huge delay on us ?
>
> Regards
>
> Agelos
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Re: [Neo4j] Database left in locked state when an exception is thrown during upgrade

[Peter Neubauer]

Paul,
I think this is fixed in SNAPSHOT, and 1.6.M03 is coming out this week
hopefully. Could you please try after the release?

Cheers,

/peter neubauer

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On Wed, Jan 11, 2012 at 5:37 PM, Paul A. Jackson  wrote:
> This is not a huge deal, since the real problem is that the database cannot 
> be updated, but I thought I would share in case this can occur in other 
> scenarios.
>
> In my case, I have a database that I created with build 1.5m02 that I am 
> opening with release 1.5. According to the error message, I must not have 
> shut down the database properly prior to upgrade. If I attempt this a second 
> time in the same process I get a different exception that implies the 
> database is still locked. It seems to me like this operation should have been 
> attempted inside a try block with a finally block that performs an unlock. 
> Here are the stack traces:
>
> First attempt:
> Caused by: org.neo4j.graphdb.TransactionFailureException: Could not create 
> data source [nioneodb], see nested exception for cause of error
>     at 
> org.neo4j.kernel.impl.transaction.TxModule.registerDataSource(TxModule.java:158)
>     at org.neo4j.kernel.GraphDbInstance.start(GraphDbInstance.java:105)
>     at 
> org.neo4j.kernel.EmbeddedGraphDbImpl.(EmbeddedGraphDbImpl.java:190)
>     at 
> org.neo4j.kernel.EmbeddedGraphDatabase.(EmbeddedGraphDatabase.java:80)
>     at com.g1.dcg.graph.neo4j.NeoGraph.(NeoGraph.java:128)
>     ... 43 more
> Caused by: java.lang.IllegalStateException: Mismatching store version found 
> (Uknown while expecting v0.A.0) and the store is not cleanly shutdown. 
> Recover the database with the previous database version and then attempt to 
> upgrade
>     at 
> org.neo4j.kernel.impl.nioneo.store.NeoStore.checkVersion(NeoStore.java:125)
>     at 
> org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.(CommonAbstractStore.java:104)
>     at 
> org.neo4j.kernel.impl.nioneo.store.AbstractStore.(AbstractStore.java:120)
>     at org.neo4j.kernel.impl.nioneo.store.NeoStore.(NeoStore.java:78)
>     at 
> org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource.(NeoStoreXaDataSource.java:165)
>     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>     at 
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>     at 
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>     at 
> org.neo4j.kernel.impl.transaction.XaDataSourceManager.create(XaDataSourceManager.java:77)
>     at 
> org.neo4j.kernel.impl.transaction.TxModule.registerDataSource(TxModule.java:152)
>     ... 47 more
>
> Second attempt in same process:
> Caused by: org.neo4j.graphdb.TransactionFailureException: Could not create 
> data source [nioneodb], see nested exception for cause of error
>     at 
> org.neo4j.kernel.impl.transaction.TxModule.registerDataSource(TxModule.java:158)
>     at org.neo4j.kernel.GraphDbInstance.start(GraphDbInstance.java:105)
>     at 
> org.neo4j.kernel.EmbeddedGraphDbImpl.(EmbeddedGraphDbImpl.java:190)
>     at 
> org.neo4j.kernel.EmbeddedGraphDatabase.(EmbeddedGraphDatabase.java:80)
>     at com.g1.dcg.graph.neo4j.NeoGraph.(NeoGraph.java:128)
>     ... 43 more
> Caused by: java.lang.IllegalStateException: Unable to lock store 
> [E:\Spectrum\server\modules\graph\db\graph\neostore], this is usually a 
> result of some other Neo4j kernel running using the same store.
>     at 
> org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.checkStorage(CommonAbstractStore.java:175)
>     at 
> org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.(CommonAbstractStore.java:103)
>     at 
> org.neo4j.kernel.impl.nioneo.store.AbstractStore.(AbstractStore.java:120)
>     at org.neo4j.kernel.impl.nioneo.store.NeoStore.(NeoStore.java:78)
>     at 
> org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource.(NeoStoreXaDataSource.java:165)
>     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>     at 
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>     at 
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>     at 
> org.neo4j.kernel.impl.transaction.XaDataSourceManager.create(XaDataSourceManager.java:77)
>     at 
> org.neo4j.kernel.impl.tra

[Neo4j] Big Data blog - interesting usecases

[Peter Neubauer]

Hi guys,

just noticed 
http://www.saama.com/blog/bid/76211/Big-Data-is-the-Answer-What-was-the-Question
which is listing a number of interesting scenarios and use cases.

Thought you might be interested ...

Cheers,

/peter neubauer

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Re: [Neo4j] Does the REL creation lock the start+end node(s)?

[Peter Neubauer]

Josef,
Yes, N1 is locked during the creation of the relationship. Different than a
table, Neo4j actually stor direct links between the nodes as relationships,
making data-local traversals without index lookups possible. This means
both nodes will be locked during the TX1 .

HTH

/Peter

On Tuesday, January 10, 2012, Josef Holy  wrote:
>  Hello neo4j-ers,
>
> I have question - when 2 threads (in embedded neo4j mode) want to
concurrently create the following RELs A and B (each within their own
transaction, nodes N1, N2 and N3 existed before):
>
> Thread 1 - tx1 - N1--RELA-->N2
> Thread 2 - tx2 - N1--RELB-->N3
>
> does the node N1 represent critical section? I mean - if Thread 2's tx2
starts later, does it have to wait till Thread 1's tx1 finishes and thus
releases node N1?
>
> Sorry for asking, but I don't know the neo4j internals and I would
expect, that the creation of relationship wouldn't lock the 2 nodes -
similarly to the relational (SQL) db, where adding rows to M:N
'relationship' table also doesn't lock records in the entity table(s)...
>
> Please advise...
>
>
> Thanks a lot!
>
> -Josef.
>
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-- 

Cheers,

/peter neubauer

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Re: [Neo4j] OSX Lion Neo4j Python bindings installation anyone?

[Peter Neubauer]

Very cool.

will keep it in mind when and if the OSX installation comes up again.
Thanks for sharing!

Cheers,

/peter neubauer

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On Mon, Dec 5, 2011 at 9:18 AM, Aaron Moffatt  wrote:
> If anyone needs example code for getting JCC hooked up instead of relying
> on JPipe, my shot at creating bindings got that working:
> https://github.com/OneSaidWho/neo4py
>
> In addition to the installation process seeming pretty straight forward
> when using JCC, the speed improvement might be beneficial as well.
>
> Thanks,
>
> Aaron Moffatt
>
> On Sun, Dec 4, 2011 at 11:55 PM, Peter Neubauer <
> peter.neuba...@neotechnology.com> wrote:
>
>> Hi all,
>> it seems the installation of JPype is not trivial on OSX Lion. Has
>> anyone been installing the Python bindings on OSX
>> (http://docs.neo4j.org/chunked/snapshot/python-embedded.html) and
>> would be willing to write down more detailed installation steps?
>>
>>
>> http://docs.neo4j.org/chunked/snapshot/python-embedded-installation.html#_installation_on_osx_linux
>> would be the place,
>>
>> https://github.com/neo4j/python-embedded/blob/master/src/docs/dev/installation.txt
>> to edit.
>>
>> Thanks!
>>
>> /peter neubauer
>>
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>>
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Re: [Neo4j] [neo4j] Running the web admin inside Tomcat

[Peter Neubauer]

Thanks Ian for putting this together, good to know for future
reference! Now we need to find a place in the manual to put this in :)

Cheers,

/peter neubauer

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On Fri, Dec 9, 2011 at 12:27 PM, Ian Forsey  wrote:
> Hi Peter,
>
> I wasn't sure what you meant by test case, since I don't think this
> something that fits in a unit test, but I've created the following repo with
> an example. The readme.MD explains how to build a war with the issue and one
> without. I'm using spring data neo4j, so have included this along with
> spring in the project, but other than that it is pretty bare-bones.
>
> https://github.com/theon/neo4j-war-with-webadmin
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Re: [Neo4j] There's already an HA cluster managed by this ZooKeeper cluster

[Peter Neubauer]

No,
once a cluster is up, it will be able to recover after being down for a while.

Cheers,

/peter neubauer

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On Fri, Dec 23, 2011 at 1:09 PM, Anirudha Ravindra Ghante
 wrote:
> Hi Peter,
>
> We are not trying to run multiple neo4j clusters on same machine.
> Configuration is :
> 3 machines : each running a ZK and neo4j server.
>
> So, does this mean that if one of the nodes goes down,  we have to delete
> the graph.db before restarting the neo4j server again (even with the above
> configuration)?
>
>
> On Fri, Dec 23, 2011 at 6:38 AM, Peter Neubauer <
> peter.neuba...@neotechnology.com> wrote:
>
>> Anirudha,
>> I think this might be a bug that is fixed in Master. Now, the Neo4j
>> Coordinator ZK cluster can manage several HA clusters and should not
>> give that exception. However, do you want to run multiple clusters
>> there? Otherwise, removing the DB and starting fresh so it gets copied
>> over from the master is the way to go.
>>
>> Cheers,
>>
>> /peter neubauer
>>
>> Google:neubauer.peter
>> Skype:peter.neubauer
>> Phone: +46 704 106975
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>> Twitter      @peterneubauer
>>
>> brew install neo4j && neo4j start
>> heroku addons:add neo4j
>>
>>
>>
>> On Fri, Dec 2, 2011 at 3:08 PM, anirudha  wrote:
>> > Hi,
>> >
>> > We are trying to setup neo4j in high-availability mode with 3 nodes in
>> the
>> > cluster.
>> > When we restart any of the neo4j servers, it fails. We get following
>> > exception:
>> >
>> > ==> neo4j-zookeeper.log <==
>> > ERROR main-EventThread org.apache.zookeeper.ClientCnxn - Error while
>> calling
>> > watcher
>> > java.lang.RuntimeException: There's already an HA cluster managed by this
>> > ZooKeeper cluster
>> >        at
>> org.neo4j.kernel.ha.zookeeper.ZooClient.getRoot(ZooClient.java:370)
>> >        at
>> >
>> org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager.getAllMachines(AbstractZooKeeperManager.java:194)
>> >        at
>> >
>> org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager.getMasterFromZooKeeper(AbstractZooKeeperManager.java:134)
>> >        at
>> org.neo4j.kernel.ha.zookeeper.ZooClient.process(ZooClient.java:122)
>> >        at
>> >
>> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
>> >        at
>> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
>> >
>> >
>> > If we delete the database folder "graph.db" and then start the server, it
>> > starts with no exception and syncs the data.
>> > Am I missing any configuration?
>> >
>> > Thanks.
>> >
>> > --
>> > View this message in context:
>> http://neo4j-community-discussions.438527.n3.nabble.com/There-s-already-an-HA-cluster-managed-by-this-ZooKeeper-cluster-tp3554731p3554731.html
>> > Sent from the Neo4j Community Discussions mailing list archive at
>> Nabble.com.
>> > ___
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Re: [Neo4j] There's already an HA cluster managed by this ZooKeeper cluster

[Peter Neubauer]

Anirudha,
I think this might be a bug that is fixed in Master. Now, the Neo4j
Coordinator ZK cluster can manage several HA clusters and should not
give that exception. However, do you want to run multiple clusters
there? Otherwise, removing the DB and starting fresh so it gets copied
over from the master is the way to go.

Cheers,

/peter neubauer

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On Fri, Dec 2, 2011 at 3:08 PM, anirudha  wrote:
> Hi,
>
> We are trying to setup neo4j in high-availability mode with 3 nodes in the
> cluster.
> When we restart any of the neo4j servers, it fails. We get following
> exception:
>
> ==> neo4j-zookeeper.log <==
> ERROR main-EventThread org.apache.zookeeper.ClientCnxn - Error while calling
> watcher
> java.lang.RuntimeException: There's already an HA cluster managed by this
> ZooKeeper cluster
>        at org.neo4j.kernel.ha.zookeeper.ZooClient.getRoot(ZooClient.java:370)
>        at
> org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager.getAllMachines(AbstractZooKeeperManager.java:194)
>        at
> org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager.getMasterFromZooKeeper(AbstractZooKeeperManager.java:134)
>        at org.neo4j.kernel.ha.zookeeper.ZooClient.process(ZooClient.java:122)
>        at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
>        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
>
>
> If we delete the database folder "graph.db" and then start the server, it
> starts with no exception and syncs the data.
> Am I missing any configuration?
>
> Thanks.
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/There-s-already-an-HA-cluster-managed-by-this-ZooKeeper-cluster-tp3554731p3554731.html
> Sent from the Neo4j Community Discussions mailing list archive at Nabble.com.
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Re: [Neo4j] There's already an HA cluster managed by this ZooKeeper cluster

[Peter Neubauer]

Anirudha,
do you have a working link to the logs/gist?

Cheers,

/peter neubauer

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On Wed, Dec 14, 2011 at 2:12 PM, Michael Hunger
 wrote:
> But it is a cute octocat github 404 :)
>
> the part w/o the ;cid... works
>
> https://gist.github.com/1433340
>
> Cheers
>
> Michael
>
> Am 14.12.2011 um 13:18 schrieb Mattias Persson:
>
>> I'm getting a 404 on that link.
>>
>> 2011/12/6 Michael Hunger 
>>
>>> Answer from Mahesh:
>>>
>>> Hi,
>>>
>>> Anirudha is a part of our team.
>>>
>>> We are using 1.5 in a 3 server setup on different physical machines.
>>>
>>> The messages.log from the server failing to start is as follows.
>>> (https://gist.github.com/1433340;cid=1323211777524-299)
>>> Here is the messages.log file on the server that is failing
>>>
>>> Hope this helps you help us..
>>>
>>> Cheers...
>>>
>>> Mahesh
>>>
>>> Am 05.12.2011 um 09:03 schrieb Peter Neubauer:
>>>
>>>> Hi there,
>>>> what version are you running, any chance you could collect the
>>>> messages.log from the instances and send them over?
>>>>
>>>> Cheers,
>>>>
>>>> /peter neubauer
>>>>
>>>> GTalk:      neubauer.peter
>>>> Skype       peter.neubauer
>>>> Phone       +46 704 106975
>>>> LinkedIn   http://www.linkedin.com/in/neubauer
>>>> Twitter      http://twitter.com/peterneubauer
>>>>
>>>> brew install neo4j && neo4j start
>>>> heroku addons:add neo4j
>>>>
>>>>
>>>>
>>>> On Fri, Dec 2, 2011 at 3:08 PM, anirudha 
>>> wrote:
>>>>> Hi,
>>>>>
>>>>> We are trying to setup neo4j in high-availability mode with 3 nodes in
>>> the
>>>>> cluster.
>>>>> When we restart any of the neo4j servers, it fails. We get following
>>>>> exception:
>>>>>
>>>>> ==> neo4j-zookeeper.log <==
>>>>> ERROR main-EventThread org.apache.zookeeper.ClientCnxn - Error while
>>> calling
>>>>> watcher
>>>>> java.lang.RuntimeException: There's already an HA cluster managed by
>>> this
>>>>> ZooKeeper cluster
>>>>>       at
>>> org.neo4j.kernel.ha.zookeeper.ZooClient.getRoot(ZooClient.java:370)
>>>>>       at
>>>>>
>>> org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager.getAllMachines(AbstractZooKeeperManager.java:194)
>>>>>       at
>>>>>
>>> org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager.getMasterFromZooKeeper(AbstractZooKeeperManager.java:134)
>>>>>       at
>>> org.neo4j.kernel.ha.zookeeper.ZooClient.process(ZooClient.java:122)
>>>>>       at
>>>>>
>>> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
>>>>>       at
>>> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
>>>>>
>>>>>
>>>>> If we delete the database folder "graph.db" and then start the server,
>>> it
>>>>> starts with no exception and syncs the data.
>>>>> Am I missing any configuration?
>>>>>
>>>>> Thanks.
>>>>>
>>>>> --
>>>>> View this message in context:
>>> http://neo4j-community-discussions.438527.n3.nabble.com/There-s-already-an-HA-cluster-managed-by-this-ZooKeeper-cluster-tp3554731p3554731.html
>>>>> Sent from the Neo4j Community Discussions mailing list archive at
>>> Nabble.com.
>>>>> ___
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>>>>> https://lists.neo4j.org/mailman/listinfo/user
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>>
>>
>>
>> --
>> Mattias Persson, [matt...@neotechnology.com]
>> Hacker, Neo Technology
>> www.neotechnology.com
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Re: [Neo4j] Subgraph isomorphism problem - graph matching problem

[Peter Neubauer]

Boris,
Have you given Cypher as a pattern matching language a try,
http://docs.neo4j.org/chunked/snapshot/cypher-query-lang.html

It is kind of superseding the graph matching component.

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 14, 2011 4:43 PM, "bm"  wrote:

>  Hi!
>
> I tried to use graph mather as a simple subgraph finder... unfortunately it
> doesn't work the way its supposed to.
>
> 1. I create simple graph:
>
>   * Node node1 = graphDb.createNode();
>node1.setProperty(ID_KEY, 11);
>node1.setProperty(TYPE_KEY, 'E');
>
>Node node2 = graphDb.createNode();
>node2.setProperty(ID_KEY, 12);
>node2.setProperty(TYPE_KEY, 'V');
>
>
>Node node3 = graphDb.createNode();
>node3.setProperty(ID_KEY, 13);
>node3.setProperty(TYPE_KEY, 'V');
>
>
>Node node4 = graphDb.createNode();
>node4.setProperty(ID_KEY, 14);
>node4.setProperty(TYPE_KEY, 'E');
>
>Node node5 = graphDb.createNode();
>node5.setProperty(ID_KEY, 15);
>node5.setProperty(TYPE_KEY, 'E');
>
>Node node6 = graphDb.createNode();
>node6.setProperty(ID_KEY, 16);
>node6.setProperty(TYPE_KEY, 'E');
>
>
>node1.createRelationshipTo(node2, RelTypes.INVOLVED);
>node2.createRelationshipTo(node4, RelTypes.INVOLVED);
>node4.createRelationshipTo(node3, RelTypes.INVOLVED);
>node3.createRelationshipTo(node1, RelTypes.INVOLVED);
>node2.createRelationshipTo(node6, RelTypes.INVOLVED);
>node6.createRelationshipTo(node5, RelTypes.INVOLVED);
>node5.createRelationshipTo(node4, RelTypes.INVOLVED);*
>
> here is a picture how it
> looks like.
>
> 2. Then I create simple pattern graph:
>
>  *  PatternNode patternNode1 = new PatternNode();
>
>patternNode1.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('E'));
>
>PatternNode patternNode2 = new PatternNode();
>patternNode2.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('V'));
>
>PatternNode patternNode3 = new PatternNode();
>patternNode3.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('V'));
>
>PatternNode patternNode4 = new PatternNode();
>patternNode4.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('E'));
>
>PatternNode patternNode5 = new PatternNode();
>patternNode5.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('E'));
>
>PatternNode patternNode6 = new PatternNode();
>patternNode6.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('E'));
>
>
>patternNode1.createRelationshipTo(patternNode2, Direction.BOTH);
>patternNode2.createRelationshipTo(patternNode4, Direction.BOTH);
>patternNode1.createRelationshipTo(patternNode3, Direction.BOTH);
>patternNode3.createRelationshipTo(patternNode4, Direction.BOTH);*
>
> link to picture.
>
> 3. Finally I try to find graph:
>
>   * PatternMatcher matcher = PatternMatcher.getMatcher();
>
>Iterable matches = matcher.match(patternNode1, node1);
>
> for (PatternMatch match : matches) {
> System.out.println("\nFOUND MATCH: ");
> for(PatternElement element: match.getElements())
> System.out.print(element.getNode().getProperty(TYPE_KEY)+
> " - "+element.getNode().getProperty(ID_KEY)+" ");
> }*
>
>
> Starting node is always the leftmost node in pictures.
>
> RESULT:
>
> FOUND MATCH:
> E - 14 E - 11 V - 13 V - 12
> FOUND MATCH:
> E - 14 E - 11 V - 12 V - 13
> FOUND MATCH:
> E - 14 E - 16 V - 12 V - 13
>
> First 2 results are fine. Second is just automorphism of first. Third
> result is totaly wrong.
>
> Is there something I am doing wrong? Will graph-matching ever support*
> true*graph matching?
>
>
> Sorry for bad english.
>
> Have a nice day. :)
> ___
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Re: [Neo4j] Subgraph isomorphism problem - graph matching problem

[Peter Neubauer]

Boris,
have you looked at Cypher for this,
http://docs.neo4j.org/chunked/snapshot/cypher-cookbook.html for some
examples, which is kind of superseding the Graph Matching component
and should save you some typing?

Cheers,

/peter neubauer

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On Wed, Dec 14, 2011 at 4:43 PM, bm  wrote:
>  Hi!
>
> I tried to use graph mather as a simple subgraph finder... unfortunately it
> doesn't work the way its supposed to.
>
> 1. I create simple graph:
>
>       * Node node1 = graphDb.createNode();
>        node1.setProperty(ID_KEY, 11);
>        node1.setProperty(TYPE_KEY, 'E');
>
>        Node node2 = graphDb.createNode();
>        node2.setProperty(ID_KEY, 12);
>        node2.setProperty(TYPE_KEY, 'V');
>
>
>        Node node3 = graphDb.createNode();
>        node3.setProperty(ID_KEY, 13);
>        node3.setProperty(TYPE_KEY, 'V');
>
>
>        Node node4 = graphDb.createNode();
>        node4.setProperty(ID_KEY, 14);
>        node4.setProperty(TYPE_KEY, 'E');
>
>        Node node5 = graphDb.createNode();
>        node5.setProperty(ID_KEY, 15);
>        node5.setProperty(TYPE_KEY, 'E');
>
>        Node node6 = graphDb.createNode();
>        node6.setProperty(ID_KEY, 16);
>        node6.setProperty(TYPE_KEY, 'E');
>
>
>        node1.createRelationshipTo(node2, RelTypes.INVOLVED);
>        node2.createRelationshipTo(node4, RelTypes.INVOLVED);
>        node4.createRelationshipTo(node3, RelTypes.INVOLVED);
>        node3.createRelationshipTo(node1, RelTypes.INVOLVED);
>        node2.createRelationshipTo(node6, RelTypes.INVOLVED);
>        node6.createRelationshipTo(node5, RelTypes.INVOLVED);
>        node5.createRelationshipTo(node4, RelTypes.INVOLVED);*
>
> here <http://shrani.si/f/5/f7/1DKus39y/picture1.jpg>is a picture how it
> looks like.
>
> 2. Then I create simple pattern graph:
>
>      *  PatternNode patternNode1 = new PatternNode();
>
>        patternNode1.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('E'));
>
>        PatternNode patternNode2 = new PatternNode();
>        patternNode2.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('V'));
>
>        PatternNode patternNode3 = new PatternNode();
>        patternNode3.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('V'));
>
>        PatternNode patternNode4 = new PatternNode();
>        patternNode4.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('E'));
>
>        PatternNode patternNode5 = new PatternNode();
>        patternNode5.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('E'));
>
>        PatternNode patternNode6 = new PatternNode();
>        patternNode6.addPropertyConstraint(TYPE_KEY, new
> ValueMatcherImpl('E'));
>
>
>        patternNode1.createRelationshipTo(patternNode2, Direction.BOTH);
>        patternNode2.createRelationshipTo(patternNode4, Direction.BOTH);
>        patternNode1.createRelationshipTo(patternNode3, Direction.BOTH);
>        patternNode3.createRelationshipTo(patternNode4, Direction.BOTH);*
>
> link <http://shrani.si/f/Y/C6/3AUZFjuo/picture2.jpg>to picture.
>
> 3. Finally I try to find graph:
>
>       * PatternMatcher matcher = PatternMatcher.getMatcher();
>
>        Iterable matches = matcher.match(patternNode1, node1);
>
>         for (PatternMatch match : matches) {
>             System.out.println("\nFOUND MATCH: ");
>             for(PatternElement element: match.getElements())
>                 System.out.print(element.getNode().getProperty(TYPE_KEY)+
> " - "+element.getNode().getProperty(ID_KEY)+" ");
>         }*
>
>
> Starting node is always the leftmost node in pictures.
>
> RESULT:
>
> FOUND MATCH:
> E - 14 E - 11 V - 13 V - 12
> FOUND MATCH:
> E - 14 E - 11 V - 12 V - 13
> FOUND MATCH:
> E - 14 E - 16 V - 12 V - 13
>
> First 2 results are fine. Second is just automorphism of first. Third
> result is totaly wrong.
>
> Is there something I am doing wrong? Will graph-matching ever support*
> true*graph matching?
>
>
> Sorry for bad english.
>
> Have a nice day. :)
> ___
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> and consider posting at https://groups.google.com/forum/#!forum/neo4j
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Re: [Neo4j] allSimplePaths performance

[Peter Neubauer]

Cool.
Got that plugin somewhere?

Cheers,

/peter neubauer

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On Tue, Dec 13, 2011 at 4:52 PM, Petar Dobrev
 wrote:
> Hey folks,
>
> just wanted to let you know that I tested it with Neo4j Community 1.6M01
> and can't reproduce the problem. It seems that it got fixed somewhere along
> the way. :)
>
> Iterating through the depth levels and calling pathsWithLength is still
> faster than allSimplePaths for depths > 5 for me, so I'm going to stick to
> it. Even wrote a small plugin for my server to do that.
>
> Thanks a lot for the great work!
>
> Best regards,
> Petar.
>
>
>
> On Mon, Nov 28, 2011 at 12:16 PM, Mattias Persson > wrote:
>
>> I think I'd need your dataset to be able to reproduce and fix it, would
>> that be possible?
>>
>> 2011/11/25 Petar Dobrev 
>>
>> > On Fri, Nov 25, 2011 at 7:59 PM, Mattias Persson
>> > wrote:
>> >
>> > >
>> > > Correct, it finds paths on that depth only. If other paths are
>> > encountered
>> > > along the way they aren't returned.
>> > >
>> > >
>> >
>> > However, in the example I provided it misses a path that is present on
>> the
>> > desired depth, that's what I was actually wondering about.
>> >
>> > In this example:
>> >
>> > The source of the testing program is here:
>> https://gist.github.com/1391654
>> > Output before adding the additional relationship:
>> > https://gist.github.com/1391668
>> > Output after adding the additional relationship:
>> > https://gist.github.com/1391661
>> >
>> > shortestPath misses one path (at depth 3) unless an additional
>> relationship
>> > is present, which is unrelated to the paths between the nodes.
>> >
>> > Petar
>> > ___
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>> >
>>
>>
>>
>> --
>> Mattias Persson, [matt...@neotechnology.com]
>> Hacker, Neo Technology
>> www.neotechnology.com
>> ___
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>>
>
>
>
> --
> Petar Dobrev
> Engineer
> Philanthropedia
> http://www.myphilanthropedia.org
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Re: [Neo4j] IndexHits extends Iterable is evil

[Peter Neubauer]

That indeed is evil, JP.

Could you raise an issue on this please? Please copy even your
explanation in there. Fully agree.

Cheers,

/peter neubauer

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On Fri, Dec 9, 2011 at 4:02 PM, Jean-Pierre Bergamin
 wrote:
> Dear neo4j community and developers
>
> For the second time we stumbled about Iterables that are no Iterables
> in Neo4j. IndexHits e.g. extends Iterator and Iterable and states in
> its documentation that is not really an iterable but always returns
> "this" in calls to iterator(). So far so good.
>
> Now when using Spring Data Neo4j, the IndexHits is wrapped and hidden
> behind ClosableIterable and IterableAdapter etc. The user has no idea
> anymore that those IterableWrapper and ClosableIterable things he gets
> back are no iterables at all - well the names tell him of course that
> those things *are* Iterables. This leads to very, very strange
> behaviour like this:
>
> @Test
> public void ouch() {
>        Device d1 = new Device("d1").persist();
>        Device d2 = new Device("d2").persist();
>
>        ClosableIterable devices = deviceRepository().findAll();
>        assertThat(devices, hasItems(d1));
>        assertEquals(1, IteratorUtil.count(devices));
> }
>
> We add two devices to our DB, but the test clearly states that
> findAll() only returns one (assertEquals(1,
> IteratorUtil.count(devices))).
> As an exercise for the reader: explain why this test misleads you
>
> Iterable should always return a valid iterator for every call to
> iterator(). Implementing Iterable just to be able to use an iterator
> in a for loop is evil. >:-)
>
>
> Best regards,
> James
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Re: [Neo4j] KeyError in python

[Peter Neubauer]

Jacopo,
are you still seeing this? It looks like there is some problems with
the Python engine. Have you tried different machines etc?

Cheers,

/peter neubauer

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On Tue, Dec 6, 2011 at 6:40 PM, Jacopo Farina  wrote:
> Hi all!
> I'm using python embedded in order to classify all the nodes in a neo4j
> graph previously labeled with properties.
> The graph is about 3.9GB with 7M nodes and 30-40M relationships. I've two
> questions:
> 1- the program worked correctly for hours then crashed suddenly with this
> error:
> Traceback (most recent call last):
> File ''assegnaCategoria.py'', line l4, in 
>  for n in db.nodes:
> File ''/usr/local/lib/python2.6/dist-packages/neo4)/ _ init _ .py'', line
> 44, in _ getitem _
>  return sel_.get(items)
> File ''/usr/local/lib/python2.6/dist-packages/neo4)/ _ init _ .py'', line
> 6l, in get
> rethrow current exception as(KeyError)
> File ''/usr/local/lib/python2.6/dist-packages/neo4)/util.py'', line 76, in
> rethrow_current_exception_as
> raise ErrorClass(msg)
> KeyError: u'Node[9327924]'
>
> 2-the program is very slow.I started it at 18 pm end it crashed at ~65% of
> the work at 4 am It only reads the database, never changing it, is there a
> way to set it to use the cache intensively? I would put it in /dev/shm/ but
> my RAM is 3GB and the database is bigger.
>
> The code is this http://codepad.org/leSwqhnc
>
> Cheers,
> Jacopo
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Re: [Neo4j] List Redirects & Missing Messages

[Peter Neubauer]

Hi all,
Everyone should be invited by now to the new list, and there are still
forwarded messages getting stuck as moderated messages like the
discussion James was referring too. Should get better over time, as
the Google Spam filters learn the pattern, and les stuff is coming
from the old list forwarded.

Thanks for your understanding!

Cheers,

/peter neubauer

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On Sun, Dec 11, 2011 at 8:53 AM, Peter Neubauer
 wrote:
> Also,
> I have sent invites you 300 of the members, now I have to wait before being
> able to invite the rest. So not everyone is over yet. Hope to get that
> through during the next few days.
>
> Sorry for the inconvenience.
>
> /peter
>
> Sent from my phone, please excuse typos and autocorrection.
>
> On Dec 11, 2011 3:13 AM, "Andreas Kollegger"  wrote:
>>
>> Hi James,
>>
>> Thanks for pointing out the problem with the redirects. Here's what we've
>> settled on:
>>
>> * forward http://neo4j.org/forums/ to the google group
>> * create http://neo4j.org/nabble/ as a read-only archive of the mailing
>> list
>>
>> The existing nabble links should now end up on the archive page instead of
>> the forums page.
>>
>> Sound ok?
>>
>> -Andreas
>>
>> On Dec 10, 2011, at 7:07 PM, James Thornton wrote:
>>
>> > I like the move to Google Groups, and I understand the need for the
>> > redirect to get everyone moved over. However, there is still some content 
>> > on
>> > the old list that isn't on the new one.
>> >
>> > For example, on the "Feedback after evaluation" thread
>> > (https://groups.google.com/d/topic/neo4j/nciMziChlc8/discussion), Michael's
>> > last few replies aren't showing up in Google Groups
>> > (http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-Feedback-after-evaluation-tp3569774p3574631.html),
>> > presumably because one of his email accounts isn't registered.
>> >
>> > And you cannot access the old list's messages anymore because of the
>> > redirect, so at the moment there is lost content.
>> >
>> > Instead of redirecting the entire list, what about redirecting the
>> > "Submit" link so that anytime someone tries to write to the old list, they
>> > are redirected here? This would enable you read the missing messages.
>> >
>> > - James
>> >
>> >
>>
>
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[Neo4j] Fwd: Re: [community] * Added Transaction#acquireWriteLock/#acquireReadLock which makes it possible to manually (0b6fae7)

[Peter Neubauer]

Fyi

/peter

Sent from my phone, please excuse typos and autocorrection.
-- Forwarded message --
From: "Andres Taylor" <
reply+c-783311-7909350cb76ca73f513b4c9dfc81fae738eba3b4-591...@reply.github.com
>
Date: Dec 9, 2011 11:33 PM
Subject: Re: [community] * Added
Transaction#acquireWriteLock/#acquireReadLock which makes it possible to
manually (0b6fae7)
To: "Neo4j build server" 

Lovely! Different isolation levels, here we come!

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Re: [Neo4j] Feedback after evaluation

[Peter Neubauer]

Yes,
I agree. Basically, with Cypher for declarative and optimizable
queries, and Gremlin/Groovy for the power user or fine-tuned
traversals, the REST API could possibly be very minimalistic. Just my
2c.

Cheers,

/peter neubauer

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On Fri, Dec 9, 2011 at 11:03 AM, James Thornton
 wrote:
>
>
>
>
>
> On Thursday, December 8, 2011 2:48:59 AM UTC-6, Dmytrii Nagirniak wrote:
>>
>>
>> Unfortunately I couldn't see a lot of value in the REST API either.
>> The core operations that are taken for granted with native bindings
>> (traversals using poor Ruby constructs) would require to execute HTTP
>> request (that's what SELECT N+1 in SQL world is).
>> Or otherwise I would have to wrap all the logic in the traversal queries.
>> It would significantly overcomplicate the system with HTTP handling logic.
>
>
> Hi Dmytrii -
>
> Neo4j Server has a built-in Gremlin scripting engine that enables REST
> clients execute transactions in a single HTTP request.
>
> Gremlin is a domain-specific language for graphs written in Groovy. If you
> were using a relational database, you would use its domain-specific
> languages, which is SQL. Same idea.
>
> For the last few weeks, I have been working on Bulbs 0.3, which is a Python
> REST client for Neo4j Server, and I has a library of Gremlin templates in a
> YAML file. The Python methods do named variable substitution on the Gremlin
> templates and then execute them via the Neo4j Server Gremlin extension.
>
> Here's an example:
>
> gremlin.yaml
> https://gist.github.com/1450859
>
> element.py
> https://gist.github.com/1450871
>
> You can see the create_indexed_vertex Gremlin script has JSON args. Python
> lists and dicts are converted to JSON, and then on the server side, the
> Gremlin script converts them into Groovy maps and lists.
>
> Marko is working on adding the JSONSlurper library import to Gremlin so you
> won't have to do the import each time
> (https://github.com/tinkerpop/gremlin/issues/259).
>
>
>> So I decided to write another REST library
>> (http:://github.com/dnagir/morpheus),
>> but then gave up realising that you just cannot have a proper abstraction
>> over HTTP.
>> (I'll probably kill off that repo).
>
> Groovy is pretty simple. Consider reviving Morpheus and using Gremlin for
> scripting -- you'll get all the power of native Ruby and Neo4j without the
> Java.
>
> When Bulbs 0.3 is released, I'll post the full gremlin.yaml, and you should
> be able to use it in Ruby without any mods since it's just YAML.
>
> - James
>
>
>
>
>
>
>
>>
>> Also there are no decent HTTP restful clients. The only one is neography -
>> that works pretty well, but doesn't give me any abstraction similar to
>> neo4j.rb.
>> There is also neology. I declare it dead, I couldn't even run tests
>> because a dependent gem was removed from the author's own github repository.
>> So I even had no way to fix any issues there.
>>
>> Last one - architect4r - good idea behind. But the abstractions are leaky.
>> You can't make system more or less performant without resorting to HTTP.
>> I also did minor contribution to it (accepted PR). But since then the
>> author never replied to my tweets, neither he replied to emails.
>> Maybe he's just sick or something else, but that's what we have.
>> And there were failing specs all over the place.
>>
>> So I decided to write another REST library
>> (http:://github.com/dnagir/morpheus), but then gave up realising that you
>> just cannot have a proper abstraction over HTTP.
>> (I'll probably kill off that repo).
>>
>>
>> So all in all, to summarise: I am giving up on neo4j because it forces me
>> into Java world to leverage its full power.
>> I could have agreed on that if I would be a Java dev. But there is nothing
>> in this world that can convince me to choose Java instead of Ruby (maybe
>> other langs in the future).
>>
>> But what DO have to mention is the dedication of people around neo4j.
>> Everybody tried their best to help.
>> And that feels like everybody within Neo Technologies has common vision
>> and is really passionate and keen to help.
>> I can't remember any other company that would be so dedicated.
>>
>> I would really love to use neo4j, but unfortunately I can't do that until
>&

Re: [Neo4j] [neo4j] Running the web admin inside Tomcat

[Peter Neubauer]

Mmh, thanks for the feedback! This sounds like a note in the docs, or
some example project setup to make sure this is documented somewhere.
Care to set up a maven project with a testcase that we could pull into
the main build system to avoid further problems? I would like to have
a WAR based project anyway in order to demonstrate servlet-based use
of Neo4j wich I could add in there ...

Cheers,

/peter neubauer

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On Thu, Dec 8, 2011 at 6:57 PM, Ian Forsey  wrote:
> It's ok, I figured a work around for this.
>
> Maven was creating a WAR with the web admin JARs in WEB-INF/lib. If I
> instead extracted the web admin static JAR so the contents were directly in
> the WAR, it worked.
>
> I had to first tell maven not to package the JAR by specifying provided as
> the scope.
>
>         
>             org.neo4j.app
>             neo4j-server
>             1.5
>             static-web
>             provided
>         
>
> Then used the maven unpack dependencies plugin to unpack the JAR into the
> WAR:
>
>             
>                 org.apache.maven.plugins
>                 maven-dependency-plugin
>                 2.4
>                 
>                     
>                         
>                             unpack-dependencies
>                         
>                         process-resources
>                     
>                 
>                 
>                     org.neo4j.app
>                     neo4j-server
>                     static-web
>                     webadmin-html/**
>
> target/graphdemo-1.0/WEB-INF/classes
>                 
>             
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Re: [Neo4j] TinkerPop Stack Release

[Peter Neubauer]

Thanks Marko,
will try to get Gremlin 1.4 into Neo4j ASAP, hopefully after the
weekend. Good work!

Cheers,

/peter neubauer

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On Thu, Dec 8, 2011 at 4:52 PM, Marko Rodriguez  wrote:
> Hello,
>
> Yesterday TinkerPop did another stable release. This release depends on Neo4j 
> 1.5. Here are the notes for those that are interested:
>
>        New homepage design: http://tinkerpop.com
>
>        Blueprints 1.1 (Blueberry):
>                https://github.com/tinkerpop/blueprints/wiki/Release-Notes
>        Pipes 0.9 (Sink):
>                https://github.com/tinkerpop/pipes/wiki/Release-Notes
>        Gremlin 1.4 (Ain't No Thing But a Chicken Wing):
>                https://github.com/tinkerpop/gremlin/wiki/Release-Notes
>        Frames 0.6 (Truss):
>                https://github.com/tinkerpop/frames/wiki/Release-Notes
>        Rexster 0.7 (Brian)
>                https://github.com/tinkerpop/rexster/wiki/Release-Notes
>                Rexster-Kibbles 0.7 (http://rexster-kibbles.tinkerpop.com)
>
>
> PLEASE READ THE FOLLOWING NOTES:
>        1. Be aware that old rexster.xml files will not work with Rexster 0.7. 
> The tag  has been changed to .
>        2. Realize that when you download Gremlin, there are two versions to 
> pick from --- Groovy and Scala.
>                - Gremlin Groovy is what everyone is familiar with.
>                - Gremlin Scala is making its debut as an experiment in 
> exposing the Gremlin style in other JVM languages besides Groovy. (thank you 
> Zach Cox)
>                - Gremlin Java exists (via Maven2 or raw .jar) for those 
> wanting to do the Gremlin style in pure Java -or- add Gremlin to another JVM 
> language.
>                - See: 
> https://github.com/tinkerpop/gremlin/wiki/JVM-Language-Implementations
>        3. Pipes no longer depends on Blueprints. All the graph specific pipes 
> have been moved to Gremlin. Pipes is simply a generic data flow framework now.
>                -  on gremlin-java if you want to use Blueprints 
> specific pipes.
>
> Enjoy!,
> Marko.
>
> http://markorodriguez.com
>
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Re: [Neo4j] println and Table Projections

[Peter Neubauer]

Started to set it up here: https://github.com/neo4j/gremlin-plugin/issues/5

Feel free to add stuff to it.

Cheers,

/peter neubauer

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On Thu, Dec 8, 2011 at 12:58 AM, Romiko Derbynew
 wrote:
> Hi,
>
> Thanks for the tips, will see if I can change the client to use the new 
> format. Indeed, let me try isolate the problems with more simpler queries. I 
> have built a test case below, forgive me if I made it to complex.
>
> Friend => HasPet => Pet => HasCareTaker => CareTaker
> Friend => HasPet => Pet => HasCareTaker => CareTaker
> Friend
>
> Test Case Script Setup
> props = [:];rootNode= g.addVertex(props);props["Name"] = "John";friendNode1 = 
> g.addVertex(props);myRelation = g.addEdge(rootNode, friendNode1, 
> 'AllFriends');props["Name"] = "Jack";friendNode2 = 
> g.addVertex(props);myRelation = g.addEdge(rootNode, friendNode2, 
> 'AllFriends');props["Name"] = "Jill";friendNode3 = 
> g.addVertex(props);myRelation = g.addEdge(rootNode, friendNode3, 
> 'AllFriends');props["Name"] = "ScoobieDoo";petNode1 = 
> g.addVertex(props);myRelation = g.addEdge(friendNode1, 
> petNode1,'HasPet');props["Name"] = "Garfield";petNode2 = 
> g.addVertex(props);myRelation = g.addEdge(friendNode2, 
> petNode2,'HasPet');props["Name"] = "Bob";careTakerNode1 = 
> g.addVertex(props);myRelation = g.addEdge(petNode1, 
> careTakerNode1,'HasCareTaker');props["Name"] = "Harry";careTakerNode2 = 
> g.addVertex(props);myRelation = g.addEdge(petNode2, 
> careTakerNode2,'HasCareTaker')
>
> Query - Works, but does not have Jill in the table.
> rootNode.out('AllFriends').as('Friend').ifThenElse{it.out('HasPet').hasNext()}{it.out('HasPet')}{it}.as('Pet').out('HasCareTaker').as('CareTaker').table(new
>  Table()){it['Name']}{it['Name']}{it['Name']}.cap
>
> Output
> [[Friend:Jack, Pet:Garfield, CareTaker:Harry], [Friend:John, Pet:ScoobieDoo, 
> CareTaker:Bob]]
>
> Attempted Query - Does not work - trying to get Jill (Notice I am trying to 
> use println)
> rootNode.out('AllFriends').as('Friend').ifThenElse{it.out('HasPet').hasNext()}{it.out('HasPet')}{println
>  "${it} Unknown"}.as('Pet').out('HasCareTaker').as('CareTaker').table(new 
> Table()){it['Name']}{it['Name']}{it['Name']}.cap
>
> Desired Output
> [[Friend:Jack, Pet:Garfield, CareTaker:Harry], [Friend:John, Pet:ScoobieDoo, 
> CareTaker:Bob], [Friend:Jill, Pet:unknown, CareTaker:unknown]]]
>
> If I can get this working, it means we can have allot more performance from 
> queries without doing separate queries if we have a powerful table projection 
> model, since I rely on the REST API, I feel the table projections is going to 
> be our core method of joining results in one call, so the idea of left/right 
> joins etc.
>
> -Original Message-
> From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On 
> Behalf Of Marko Rodriguez
> Sent: Wednesday, 7 December 2011 7:07 PM
> To: Neo4j user discussions
> Cc: ne...@googlegroups.com
> Subject: Re: [Neo4j] println and Table Projections
>
> Hi,
>
> Peter brings up a good point. Its hard for us to parse complex queries and 
> see where Exceptions are happening. If you can isolate the problem via a 
> simpler traversal, that would be best for us -- and our little baby brains.
>
> Also, note the following syntax optimizations for your traversal:
>        1. outE[[label:'HOSTS']].inV ---> out('HOSTS')
>        2. Similarly, inE[[label:'X']].outV -> in('X')
>
> Using out() and in() is much more efficient (faster) and more concise. Unless 
> you plan to reason on the properties of an edge, then there is no reason to 
> use outE.inV style syntax as out will do the full vertex-to-vertex jump for 
> you.
>
> HTH,
> Marko.
>
> http://markorodriguez.com
>
> On Dec 7, 2011, at 1:00 AM, Peter Neubauer wrote:
>
>> Mmh,
>> I was thinking on how to return the contents of the output stream, I
>> am not quite sure how to return that. What woudl be a good format for
>> you?
>>
>> Also could you reduce this into a small testcase that I can work

Re: [Neo4j] Neo4jClient - Query optmised

[Peter Neubauer]

nice,
thanks! Will prepare the testcases for the other case you were asking about.

Cheers,

/peter neubauer

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On Thu, Dec 8, 2011 at 5:14 AM, Romiko Derbynew
 wrote:
> Finally thanks to Peter and Marko, the .Net Neo4jClient code has been 
> optimised to use short hand version of in('') and out('').
> ChangeSet is http://hg.readify.net/neo4jclient/changeset/91ef447a9053
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[Neo4j] Switching mailinglist during the weekend to Google Groups

[Peter Neubauer]

Hi all,
it turns out the Google Apps for you Domain Groups are not showing up
in the central Google Index. That means we will switch this weekend to
https://groups.google.com/forum/#!forum/neo4j instead.

Currently, every mail to this list is forwarded to the new Google
Group, and this will stay so. However, you all will get a notice that
you are added to the new list sometime this week, and we are setting
up an autoresponse saying

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Re: [Neo4j] With rest,how to get the root URI

[Peter Neubauer]

Ahh yes,
Good call!

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 7, 2011 4:40 PM, "maxdemarzi"  wrote:

> http://docs.neo4j.org/chunked/milestone/rest-api-service-root.html
>
> The Reference Node:
>
> {
>  "relationship_index" : "http://localhost:7474/db/data/index/relationship
> ",
>  "node" : "http://localhost:7474/db/data/node";,
>  "relationship_types" : "http://localhost:7474/db/data/relationship/types
> ",
>  "neo4j_version" : "1.6.M01",
>  "batch" : "http://localhost:7474/db/data/batch";,
>  "extensions_info" : "http://localhost:7474/db/data/ext";,
>  "node_index" : "http://localhost:7474/db/data/index/node";,
>  "reference_node" : "http://localhost:7474/db/data/node/107";,
>  "extensions" : {
>  }
> }
>
> Which reminds me that I need to update neograpy since I simply assume the
> root is node 0, but it seems that isn't always the case.
>
> --
> View this message in context:
> http://neo4j-community-discussions.438527.n3.nabble.com/With-rest-how-to-get-the-root-URI-tp3566691p3567770.html
> Sent from the Neo4j Community Discussions mailing list archive at
> Nabble.com.
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Re: [Neo4j] Cypher <3 Trees

[Peter Neubauer]

Mmh,
I would like to see that I can specify the "stem" of the tree as a
path and then get leaf nodes out from that, something like

START root = node(0)
MATCH stem=root->(dir?*), stem-[:LEAF]->leaf
WHERE all(x in nodes(stem)
WHERE x.importance > 30)
RETURN leaf, stem

Does that make sense?

Cheers,

/peter neubauer

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On Wed, Dec 7, 2011 at 2:53 PM, Andres Taylor
 wrote:
> A subset of the graphs are trees, and they have a few problems that are
> specific for them. I'm right now planning what needs to be added to Cypher
> to make it play nice with your tree structures.
>
> I'd love to know if you have hierarchical data, and what queries you do and
> would like to do. Doesn't matter if you use Cypher or not.
>
> Thanks!
>
> Andrés
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Re: [Neo4j] Neo4j for a CMS backend

[Peter Neubauer]

Haha,
sorry, my bad. I meant CMDB actually :) Thanks for pointing that out Axel!

Cheers,

/peter neubauer

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On Wed, Dec 7, 2011 at 9:30 AM, Axel Morgner  wrote:
> Hi Peter,
>
> seems like you confused CMDB (Configuration Management Database) with
> CMS (Content Management System)? While Neo4j is perfect for building
> both, the use cases don't have very much in common ...
>
> Greetings
>
> Axel
>
>
> Am 07.12.2011 09:26, schrieb Peter Neubauer:
>> Hi folks,
>> thought this might be interesting for some of you ...
>> http://www.dzone.com/links/r/why_im_pretty_excited_about_using_neo4j_for_a_cmd.html
>>
>> Cheers,
>>
>> /peter neubauer
>>
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>>
>> brew install neo4j&&  neo4j start
>> heroku addons:add neo4j
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[Neo4j] Neo4j for a CMS backend

[Peter Neubauer]

Hi folks,
thought this might be interesting for some of you ...
http://www.dzone.com/links/r/why_im_pretty_excited_about_using_neo4j_for_a_cmd.html

Cheers,

/peter neubauer

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Re: [Neo4j] println and Table Projections

[Peter Neubauer]

Mmh,
I was thinking on how to return the contents of the output stream, I
am not quite sure how to return that. What woudl be a good format for
you?

Also could you reduce this into a small testcase that I can work on?

Cheers,

/peter neubauer

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On Wed, Dec 7, 2011 at 8:10 AM, Romiko Derbynew
 wrote:
> Hi,
>
> I have this statement.
> g.v('0').outE[[label:'HOSTS']].inV.filter{ 
> it['Key'].equalsIgnoreCase('romikoagency') 
> }.inE[[label:'USER_BELONGS_TO']].outV.filter{ 
> it['Username'].equalsIgnoreCase('romiko.derbynew') 
> }.ifThenElse{it.outE[[label:'USER_LINKED_TO_CENTRE']].inV.hasNext()}{it.outE[[label:'USER_LINKED_TO_CENTRE']].inV.Name}{println
>  ${it} "Unknown"}.as('Centre')
>
> I then take this query and do a table projection, however I get the following 
> error.
> println java.lang.String cannot be cast to com.tinkerpop.blueprints.pgm.Vertex
>
> Is there a better way to do this then? I want to reduce our calls to the DB 
> for performance and finding it a bit tough wrapping everything into one  
> query. Currently the above query is split into two different queries.
>
> Much appreciated.
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Re: [Neo4j] HA starting issue

[Peter Neubauer]

Have you got the logs (probably mostly messages.log from the failing instance?

Cheers,

/peter neubauer

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On Tue, Dec 6, 2011 at 1:55 PM, lawrence.bandeira
 wrote:
> Hi Ian,
>
> I already followed this steps and I couldn't run Neo4j in HA Mode.
>
> The following log has appeared when I type:
> ./neo4j-enterprise-1.5-1/bin/neo4j start
> Starting Neo4j Server...WARNING: not changing user
>  process [6226]... waiting for server to be ready... BAD.
> Neo4j Server may have failed to start, please check the logs.
>
> When I run in Single Mode it works, but when I run in HA mode, that just
> happens.
>
> I tried on Windows and Linux and I have the same problem.
>
> Thanks for your time.
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-HA-starting-issue-tp3260535p3564254.html
> Sent from the Neo4j Community Discussions mailing list archive at Nabble.com.
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[Neo4j] Malmö Neo4j meetup tonight

[Peter Neubauer]

Hi all,
for those of you in Lund, Malmö, CPH or Helsingborg, come over to MINC
for some Heroku, Jruby and Cypher beering tonight!

http://www.meetup.com/Neo4j-Oresund/events/42155032/

Cheers,

/peter neubauer

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[Neo4j] Anyone interested to present Neo4j at the JUG in Atlanta?

[Peter Neubauer]

Hi folks,
is anyone interested in presenting Neo4j at the JUG in Atlanta i 21-22
March 2012? Would love to promote some awesome Graphistas personal
brands there!

Cheers,

/peter neubauer

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Re: [Neo4j] [Neo4j-User] Re: org.neo4j.graphdb.TransactionFailureException: Could not create data source lucene[lucene]

[Peter Neubauer]

Yes.
Let me know your address, and I will send one. Green with a white
Rabbit on it. Seriously.

Cheers,

/peter neubauer

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On Tue, Dec 6, 2011 at 11:09 AM, ajinkyar  wrote:
> That reference cost us hell lotta time!! Do we get a free neo4j t-shirt for
> pointing that out ;) !?
>
> On Tue, Dec 6, 2011 at 5:04 AM, Peter Neubauer [via Neo4j Community
> Discussions]  wrote:
>
>> Ajinkya,
>> thanks for pointing this out. Killed and forwarded the wiki page.
>>
>> Cheers,
>>
>> /peter neubauer
>>
>> GTalk:      neubauer.peter
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>> LinkedIn   http://www.linkedin.com/in/neubauer
>> Twitter      http://twitter.com/peterneubauer
>>
>> brew install neo4j && neo4j start
>> heroku addons:add neo4j
>>
>>
>>
>> On Tue, Dec 6, 2011 at 10:34 AM, ajinkyar <[hidden 
>> email]<http://user/SendEmail.jtp?type=node&node=3563901&i=0>>
>> wrote:
>>
>> > Thanks for the suggestion .. I will give that a try.
>> > I found the reference here
>> > http://wiki.neo4j.org/content/Indexing_with_IndexService
>> >
>> > On Tue, Dec 6, 2011 at 4:10 AM, Michael Hunger [via Neo4j Community
>> > Discussions] <[hidden 
>> > email]<http://user/SendEmail.jtp?type=node&node=3563901&i=1>>
>> wrote:
>> >
>> >> You don't need LuceneIndexService, where did you find the documentation
>> >> that said to use the old index service? We would like to update that.
>> >>
>> >> just
>> >>
>> >> Index myIndex = graphDb.index().forNodes("indexName");
>> >> index.add(node, "key", value);
>> >> index.get("key",value);
>> >> index.query(query);
>> >>
>> >> etc.
>> >>
>> >> see: http://docs.neo4j.org/chunked/milestone/indexing.html
>> >>
>> >> Cheers,
>> >>
>> >> Michael
>> >>
>> >> Am 06.12.2011 um 09:50 schrieb ajinkyar:
>> >>
>> >> > In that case I cannot use LuceneIndexService ... can you please
>> suggest
>> >> me a
>> >> > way so that I can use LuceneIndexService ?
>> >> >
>> >> > With neo4j-lucene-index-1.6-SNAPSHOT.jar and lucene-core-3.1.0.jar I
>> am
>> >> not
>> >> > able to use LuceneIndexService ..
>> >> >
>> >> >
>> >> >
>> >> > --
>> >> > View this message in context:
>> >>
>> http://neo4j-community-discussions.438527.n3.nabble.com/org-neo4j-graphdb-TransactionFailureException-Could-not-create-data-source-lucene-lucene-tp3560554p3563787.html
>> >>
>> >> > Sent from the Neo4j Community Discussions mailing list archive at
>> >> Nabble.com.
>> >> > ___
>> >> > Neo4j mailing list
>> >> > [hidden email] <http://user/SendEmail.jtp?type=node&node=3563820&i=0>
>>
>> >> > https://lists.neo4j.org/mailman/listinfo/user
>> >>
>> >> ___
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>> >>
>> >>
>> >> --
>> >>  If you reply to this email, your message will be added to the
>> discussion
>> >> below:
>> >>
>> >>
>> http://neo4j-community-discussions.438527.n3.nabble.com/org-neo4j-graphdb-TransactionFailureException-Could-not-create-data-source-lucene-lucene-tp3560554p3563820.html
>> >>  To unsubscribe from org.neo4j.graphdb.TransactionFailureException:
>> Could
>> >> not create data source lucene[lucene], click here<
>>
>> >> .
>> >> NAML<
>> http://neo4j-community-discussions.438527.n3.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.InstantMailNamespace&breadcrumbs=instant+emails%21nabble%3Aemail.n

Re: [Neo4j] [Neo4j-User] Re: org.neo4j.graphdb.TransactionFailureException: Could not create data source lucene[lucene]

[Peter Neubauer]

Ajinkya,
thanks for pointing this out. Killed and forwarded the wiki page.

Cheers,

/peter neubauer

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On Tue, Dec 6, 2011 at 10:34 AM, ajinkyar  wrote:
> Thanks for the suggestion .. I will give that a try.
> I found the reference here
> http://wiki.neo4j.org/content/Indexing_with_IndexService
>
> On Tue, Dec 6, 2011 at 4:10 AM, Michael Hunger [via Neo4j Community
> Discussions]  wrote:
>
>> You don't need LuceneIndexService, where did you find the documentation
>> that said to use the old index service? We would like to update that.
>>
>> just
>>
>> Index myIndex = graphDb.index().forNodes("indexName");
>> index.add(node, "key", value);
>> index.get("key",value);
>> index.query(query);
>>
>> etc.
>>
>> see: http://docs.neo4j.org/chunked/milestone/indexing.html
>>
>> Cheers,
>>
>> Michael
>>
>> Am 06.12.2011 um 09:50 schrieb ajinkyar:
>>
>> > In that case I cannot use LuceneIndexService ... can you please suggest
>> me a
>> > way so that I can use LuceneIndexService ?
>> >
>> > With neo4j-lucene-index-1.6-SNAPSHOT.jar and lucene-core-3.1.0.jar I am
>> not
>> > able to use LuceneIndexService ..
>> >
>> >
>> >
>> > --
>> > View this message in context:
>> http://neo4j-community-discussions.438527.n3.nabble.com/org-neo4j-graphdb-TransactionFailureException-Could-not-create-data-source-lucene-lucene-tp3560554p3563787.html
>>
>> > Sent from the Neo4j Community Discussions mailing list archive at
>> Nabble.com.
>> > ___
>> > Neo4j mailing list
>> > [hidden email] <http://user/SendEmail.jtp?type=node&node=3563820&i=0>
>> > https://lists.neo4j.org/mailman/listinfo/user
>>
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>>
>> --
>>  If you reply to this email, your message will be added to the discussion
>> below:
>>
>> http://neo4j-community-discussions.438527.n3.nabble.com/org-neo4j-graphdb-TransactionFailureException-Could-not-create-data-source-lucene-lucene-tp3560554p3563820.html
>>  To unsubscribe from org.neo4j.graphdb.TransactionFailureException: Could
>> not create data source lucene[lucene], click 
>> here<http://neo4j-community-discussions.438527.n3.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=3560554&code=a2FsZWFqaW5reWFAZ21haWwuY29tfDM1NjA1NTR8ODk3NzQzMjIx>
>> .
>> NAML<http://neo4j-community-discussions.438527.n3.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.InstantMailNamespace&breadcrumbs=instant+emails%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
>>
>
>
>
> --
>
> Regards,
> Ajinkya
> http://ajinkya.info
>
>
> .O.
> ..O
> OOO
>
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/org-neo4j-graphdb-TransactionFailureException-Could-not-create-data-source-lucene-lucene-tp3560554p3563862.html
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Re: [Neo4j] [Neo4j-User] Queries about HA

[Peter Neubauer]

Samuel,
I would recommend HA for your usecase, since then the Neo4j cluster
will handling new neo4j instances appearing and copying data etc. Look
at http://docs.neo4j.org/chunked/snapshot/ha.html for setup docs.

There seems to be some interest in RMI remoting to neo4j. However, we
think this is not the ultimate way to go in the long run since it is
Java-centric and still not fast and stable enough for want we want to
achieve. However, if the community finds it useful, I am all up for
someone stepping up and invest the last mile to make it good, maybe
put it on GIThub for easier collaboration, of course.

Tobias original code is at
https://svn.neo4j.org/components/remote-graphdb/trunk/, and the API
should not have moved terribly out of sync, so I guess it is not a LOT
of work to at least get it working.

Anyone?

Cheers,

/peter neubauer

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On Tue, Dec 6, 2011 at 4:43 AM, Samuel Feng  wrote:
> Dear List,
>
> I'm using neo4j 1.5GA and using embeddedGraphDatabase to access the graph.
> Now the graph size is around 4G.
>
> Now I would like to try HA mode and have several questions.
>
> 1) Can I access the graph in some kind of remote mode? So that I can use
> many tomcat servers to access the graph remotely and do not need to change
> any code. I understand neo4j can run as a server, however, we can only use
> REST api to accessing the neo4j server, this will cause many many code
> changes for me. Please correct me if I have any misunderstanding.
>
> Seems there is a neo4j-remote-graphdb component which uses RMI to access a
> graph remotely. BUT in the wiki
> http://components.neo4j.org/neo4j-remote-graphdb/stable/, you mentioned "The
> implementation is not speedy enough to be used as the main access channel
> to a Graph Database for actual applications."
>
> 2) If I use neo4j embedded in HA mode, say, I have two neo4j instances(A &
> B) running, When instance A crashed, B continues to work and has many
> writes on it. Then Server A is recovered but it can not attach itself to
> the cluster as the wrong data version. So I need to manually replace the
> instance A's data using B's.
>
> But the graph size is around 4G, I have to copy all the 4G data to server
> A? Or any other simple and fast ways?
>
> Thanks and Regards,
>
> Samuel
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Re: [Neo4j] [Neo4j-User] What is this query in JavaScript (REST)?

[Peter Neubauer]

Hi there,
Any reason you need to do that explicitly?

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 6, 2011 2:51 AM, "Dmytrii Nagirniak"  wrote:

> Hi,
>
> How would I rewrite this Cypher query with JavaScript (so it can be sent
> to the traversal API)?
>
> START s=node(123) MATCH s->[:users]->[:current]->u WHERE u.email = 'abc'
> RETURN u
>
> Cheers,
> Dmytrii.
> http://www.ApproachE.com
>
>
>
>
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[Neo4j] GAFYD groups and google search?

[Peter Neubauer]

Hi all,
we were thinking of migrating the list to u...@neo4j.org, but there
seems to be the problem that the main google index is not indexing
groups hosted on GAFYD (neo4j.org). Does anyone know if that is really
the case or if there is workarounds? Would suck not to have a
searchable archive.

If not, it seems the next best option is to have a normal Google
Group, like https://groups.google.com/forum/#!forum/neo4j which we can
use.

Any Google experts out there with insights?

Cheers,

/peter neubauer

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Re: [Neo4j] [Neo4j-User] Re: Aggregates inside copySplit()

[Peter Neubauer]

Cool.
lemme know if you need any help with that maybe outline planning or so.

Cheers,

/peter neubauer

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On Mon, Dec 5, 2011 at 11:39 PM, Romiko Derbynew
 wrote:
> Hi Peter,
>
> That sounds like a nice idea for sure :)
>
> -Original Message-
> From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On 
> Behalf Of Peter Neubauer
> Sent: Monday, 5 December 2011 5:31 PM
> To: Neo4j user discussions
> Subject: Re: [Neo4j] Aggregates inside copySplit()
>
> Wohow,
> cool work Romiko! I would love a screencast on this from the .NET side!
>
> Cheers,
>
> /peter neubauer
>
> GTalk:      neubauer.peter
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> Twitter      http://twitter.com/peterneubauer
>
> brew install neo4j && neo4j start
> heroku addons:add neo4j
>
>
>
> On Mon, Dec 5, 2011 at 6:34 AM, Romiko Derbynew  
> wrote:
>> Hi Marko,
>>
>> Working nicely now :)
>>
>> Here is how it looks on our client. I am not sure if I can call _() an 
>> identityPipe, any inspiration here? I had to use Aggregate here, instead of 
>> Store(), else the Except does not work.
>>
>> var results = graphClient
>>                .RootNode
>>                .CopySplit(
>>                    new IdentityPipe()
>>                        .Out(Hosts.TypeKey, a => a.Key ==
>> userIdentifier.AgencyKey)
>>                        .In(UserBelongsTo.TypeKey)
>>                        .Out(UserLinkedToCentre.TypeKey)
>>                        .In(UserLinkedToCentre.TypeKey)
>>                        .In(CreatedBy.TypeKey, r =>
>> r.Completed == false)
>>                        .AggregateV("ReferralWithCentres"),
>>                    new IdentityPipe()
>>                        .Out(Hosts.TypeKey, a => a.Key ==
>> userIdentifier.AgencyKey)
>>                )
>>                .FairMerge()
>>                .In(ReferralBelongsTo.TypeKey, r =>
>> r.Completed == false)
>>                .As("ReferralId")
>>                .ExceptV("ReferralWithCentres")
>>                .GremlinDistinct()
>>                .Out(CreatedBy.TypeKey)
>>                .As("UserGivenName")
>>                .As("UserFamilyName")
>>                .Table(
>>                    referral => referral.UniqueId,
>>                    user => user.FamilyName,
>>                    user => user.GivenName
>>                );
>>
>> Which generates this optimised query.
>> ReferralWithCentres =
>> [];g.v(p0)._.copySplit(_().outE[[label:p1]].inV.filter{
>> it[p2].equalsIgnoreCase(p3)
>> }.inE[[label:p4]].outV.outE[[label:p5]].inV.inE[[label:p6]].outV.inE[[
>> label:p7]].outV.filter{ it[p8] == p9 }.aggregate(ReferralWithCentres),
>> _().outE[[label:p10]].inV.filter{ it[p11].equalsIgnoreCase(p12)
>> }).fairMerge.inE[[label:p13]].outV.filter{ it[p14] == p15
>> }.as(p16).except(ReferralWithCentres).uniqueObject().outE[[label:p17]]
>> .inV.as(p18).as(p19).table(new Table()){it[p20]}{it[p21]}{it[p22]}.cap
>>
>> Thanks again for all the help :)
>>
>> -Original Message-
>> From: user-boun...@lists.neo4j.org
>> [mailto:user-boun...@lists.neo4j.org] On Behalf Of Marko A. Rodriguez
>> Sent: Sunday, 4 December 2011 4:09 PM
>> To: Neo4j user discussions
>> Subject: Re: [Neo4j] Aggregates inside copySplit()
>>
>> Hey,
>>
>> That will probably give you unwanted behavior as aggregate is a greedy step. 
>> If you just want to lazily store and not aggregate then:
>>
>>  Gremlin 1.3:   sideEffect{x.add(it)}
>>  Gremlin 1.4:   store(x)
>>
>> HTH,
>> Marko.
>>
>> http://markorodriguez.com
>>
>> On Dec 3, 2011, at 8:50 PM, Romiko Derbynew  
>> wrote:
>>
>>> Sorry, forgot to complete question. So I use a 
>>> x=[];g.v(0).out.copySplit(_().out.aggregate(x), 
>>> _().out).fairMerge().out.retain(x). I guess this is not possible, where a 
>>> retain clause is used after a fairMerge()?
>>>
>>> -Original Message-
>>> From: user-boun...@lists.neo4j.org
>>> [mailto:user-boun...@lists.neo4j.org] On Behalf Of Romiko Derbynew
>>> Sent: Sunday, 4 December 2011 2:38 PM
>>>

Re: [Neo4j] Not sure how to access webadmin in Red Hat Enterprise Linux 5.4

[Peter Neubauer]

Nice.
Thanks for sharing Max!

Cheers,

/peter neubauer

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On Mon, Dec 5, 2011 at 9:23 AM, maxdemarzi  wrote:
> Bring up the Putty GUI.
> Load your saved session
> On the side menu:
> Go to Connection > SSH > Tunnels
> Source Port: 7474
> Destination: localhost:7474
> Click "Add"
> Click back on Session on the side menu
> Click on your saved session.
> Click Save.
> Now try it again, and it will setup the tunnel for you when you connect.
>
>
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/Not-sure-how-to-access-webadmin-in-Red-Hat-Enterprise-Linux-5-4-tp3558449p3560770.html
> Sent from the Neo4j Community Discussions mailing list archive at Nabble.com.
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Re: [Neo4j] org.neo4j.graphdb.TransactionFailureException: Could not create data source lucene[lucene]

[Peter Neubauer]

Hi,
this sounds like a version error:

Caused by: java.lang.NoSuchMethodError:
org.neo4j.kernel.impl.transaction.xaframework.XaContainer.create(Ljava/lang/String;Lorg/neo4j/kernel/impl/transaction/xaframework/XaCommandFactory;Lorg/neo4j/kernel/impl/transaction/xaframework/XaTransactionFactory;Ljava/

What versions of the JARs are on your classpath? The first lines of
each messages.log will contain the classpath for the neo4j instance
...

Cheers,

/peter neubauer

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On Mon, Dec 5, 2011 at 9:16 AM, Ajinkya Kale  wrote:
> Caused by: java.lang.NoSuchMethodError:
> org.neo4j.kernel.impl.transaction.xaframework.XaContainer.create(Ljava/lang/String;Lorg/neo4j/kernel/impl/transaction/xaframework/XaCommandFactory;Lorg/neo4j/kernel/impl/transaction/xaframework/XaTransactionFactory;Ljava/
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Re: [Neo4j] There's already an HA cluster managed by this ZooKeeper cluster

[Peter Neubauer]

Hi there,
what version are you running, any chance you could collect the
messages.log from the instances and send them over?

Cheers,

/peter neubauer

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On Fri, Dec 2, 2011 at 3:08 PM, anirudha  wrote:
> Hi,
>
> We are trying to setup neo4j in high-availability mode with 3 nodes in the
> cluster.
> When we restart any of the neo4j servers, it fails. We get following
> exception:
>
> ==> neo4j-zookeeper.log <==
> ERROR main-EventThread org.apache.zookeeper.ClientCnxn - Error while calling
> watcher
> java.lang.RuntimeException: There's already an HA cluster managed by this
> ZooKeeper cluster
>        at org.neo4j.kernel.ha.zookeeper.ZooClient.getRoot(ZooClient.java:370)
>        at
> org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager.getAllMachines(AbstractZooKeeperManager.java:194)
>        at
> org.neo4j.kernel.ha.zookeeper.AbstractZooKeeperManager.getMasterFromZooKeeper(AbstractZooKeeperManager.java:134)
>        at org.neo4j.kernel.ha.zookeeper.ZooClient.process(ZooClient.java:122)
>        at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
>        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
>
>
> If we delete the database folder "graph.db" and then start the server, it
> starts with no exception and syncs the data.
> Am I missing any configuration?
>
> Thanks.
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/There-s-already-an-HA-cluster-managed-by-this-ZooKeeper-cluster-tp3554731p3554731.html
> Sent from the Neo4j Community Discussions mailing list archive at Nabble.com.
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[Neo4j] OSX Lion Neo4j Python bindings installation anyone?

[Peter Neubauer]

Hi all,
it seems the installation of JPype is not trivial on OSX Lion. Has
anyone been installing the Python bindings on OSX
(http://docs.neo4j.org/chunked/snapshot/python-embedded.html) and
would be willing to write down more detailed installation steps?

http://docs.neo4j.org/chunked/snapshot/python-embedded-installation.html#_installation_on_osx_linux
would be the place,
https://github.com/neo4j/python-embedded/blob/master/src/docs/dev/installation.txt
to edit.

Thanks!

/peter neubauer

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Re: [Neo4j] org.neo4j.graphdb.TransactionFailureException: Could not create data source lucene[lucene]

[Peter Neubauer]

Ajinkya,
are you sure you have shut down your BatchInserter and no other Java
process is accessing the DB? Also, the full stacktrace from the log
would be helpful ...

Cheers,

/peter neubauer

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On Mon, Dec 5, 2011 at 6:48 AM, ajinkyar  wrote:
> org.neo4j.graphdb.TransactionFailureException: Could not create data source
> lucene[lucene]
>        at
> org.neo4j.kernel.impl.transaction.TxModule.registerDataSource(TxModule.java:189)
>        at
> org.neo4j.kernel.GraphDbInstance.registerLuceneDataSource(GraphDbInstance.java:212)
>        at org.neo4j.kernel.GraphDbInstance.start(GraphDbInstance.java:114)
>        at
> org.neo4j.kernel.EmbeddedGraphDbImpl.(EmbeddedGraphDbImpl.java:187)
>        at
> org.neo4j.kernel.EmbeddedGraphDatabase.(EmbeddedGraphDatabase.java:80)
>        at
> org.neo4j.kernel.EmbeddedGraphDatabase.(EmbeddedGraphDatabase.java:63)
>
>
> EmbeddedGraphDatabase not working with lucene-core-3.1.0.jar (or any lucene
> jar) and gives above error.
> Whereas BatchInserterImpl works fine with  lucene-core-3.1.0.jar
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/org-neo4j-graphdb-TransactionFailureException-Could-not-create-data-source-lucene-lucene-tp3560554p3560554.html
> Sent from the Neo4j Community Discussions mailing list archive at Nabble.com.
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Re: [Neo4j] Aggregates inside copySplit()

[Peter Neubauer]

Wohow,
cool work Romiko! I would love a screencast on this from the .NET side!

Cheers,

/peter neubauer

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On Mon, Dec 5, 2011 at 6:34 AM, Romiko Derbynew
 wrote:
> Hi Marko,
>
> Working nicely now :)
>
> Here is how it looks on our client. I am not sure if I can call _() an 
> identityPipe, any inspiration here? I had to use Aggregate here, instead of 
> Store(), else the Except does not work.
>
> var results = graphClient
>                .RootNode
>                .CopySplit(
>                    new IdentityPipe()
>                        .Out(Hosts.TypeKey, a => a.Key == 
> userIdentifier.AgencyKey)
>                        .In(UserBelongsTo.TypeKey)
>                        .Out(UserLinkedToCentre.TypeKey)
>                        .In(UserLinkedToCentre.TypeKey)
>                        .In(CreatedBy.TypeKey, r => r.Completed == 
> false)
>                        .AggregateV("ReferralWithCentres"),
>                    new IdentityPipe()
>                        .Out(Hosts.TypeKey, a => a.Key == 
> userIdentifier.AgencyKey)
>                )
>                .FairMerge()
>                .In(ReferralBelongsTo.TypeKey, r => r.Completed == 
> false)
>                .As("ReferralId")
>                .ExceptV("ReferralWithCentres")
>                .GremlinDistinct()
>                .Out(CreatedBy.TypeKey)
>                .As("UserGivenName")
>                .As("UserFamilyName")
>                .Table(
>                    referral => referral.UniqueId,
>                    user => user.FamilyName,
>                    user => user.GivenName
>                );
>
> Which generates this optimised query.
> ReferralWithCentres = [];g.v(p0)._.copySplit(_().outE[[label:p1]].inV.filter{ 
> it[p2].equalsIgnoreCase(p3) 
> }.inE[[label:p4]].outV.outE[[label:p5]].inV.inE[[label:p6]].outV.inE[[label:p7]].outV.filter{
>  it[p8] == p9 }.aggregate(ReferralWithCentres), 
> _().outE[[label:p10]].inV.filter{ it[p11].equalsIgnoreCase(p12) 
> }).fairMerge.inE[[label:p13]].outV.filter{ it[p14] == p15 
> }.as(p16).except(ReferralWithCentres).uniqueObject().outE[[label:p17]].inV.as(p18).as(p19).table(new
>  Table()){it[p20]}{it[p21]}{it[p22]}.cap
>
> Thanks again for all the help :)
>
> -Original Message-
> From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On 
> Behalf Of Marko A. Rodriguez
> Sent: Sunday, 4 December 2011 4:09 PM
> To: Neo4j user discussions
> Subject: Re: [Neo4j] Aggregates inside copySplit()
>
> Hey,
>
> That will probably give you unwanted behavior as aggregate is a greedy step. 
> If you just want to lazily store and not aggregate then:
>
>  Gremlin 1.3:   sideEffect{x.add(it)}
>  Gremlin 1.4:   store(x)
>
> HTH,
> Marko.
>
> http://markorodriguez.com
>
> On Dec 3, 2011, at 8:50 PM, Romiko Derbynew  
> wrote:
>
>> Sorry, forgot to complete question. So I use a 
>> x=[];g.v(0).out.copySplit(_().out.aggregate(x), 
>> _().out).fairMerge().out.retain(x). I guess this is not possible, where a 
>> retain clause is used after a fairMerge()?
>>
>> -Original Message-
>> From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On 
>> Behalf Of Romiko Derbynew
>> Sent: Sunday, 4 December 2011 2:38 PM
>> To: Neo4j user discussions (user@lists.neo4j.org)
>> Subject: [Neo4j] Aggregates inside copySplit()
>>
>> Hi,
>>
>> Is it possible to use aggregates within a copySplit pipe?
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Re: [Neo4j] Compilation Error Community Edition 1.6

[Peter Neubauer]

I think this is because the kernel is generating a version java class with
the current GIT version in it, and therefore needs to get that from
somewhere.

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 4, 2011 6:00 PM, "gouravmitra"  wrote:

> Peter,
>
>  I have complied with JDK 6 and Maven 3. It has compiled and generated
> executables in target folder. Here is the log
>
> http://neo4j-community-discussions.438527.n3.nabble.com/file/n3559411/InstallLog1204.txt
> InstallLog1204.txt .
>
> I also saw two errors on my console
>
> [exec] Execute failed: java.io.IOException: Cannot run program "git.cmd":
> CreateProcess error=2, The system cannot find the file specified
> [exec] Execute failed: java.io.IOException: Cannot run program "git.cmd":
> CreateProcess error=2, The system cannot find the file specified
>
> git.cmd isn't in Path variable. However, I am curious to know why it is
> trying to execute git.cmd.
>
> Gourav
>
>
> -
> Gourav Mitra
> --
> View this message in context:
> http://neo4j-community-discussions.438527.n3.nabble.com/Compilation-Error-Community-Edition-1-6-tp3558335p3559411.html
> Sent from the Neo4j Community Discussions mailing list archive at
> Nabble.com.
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Re: [Neo4j] Relationship indexes

[Peter Neubauer]

Frank,
Do you have a minimal test case reproducing this?

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 2, 2011 9:12 PM, "Frank"  wrote:

> Thanks for the reply.
>
> I *think* that what I need is to do is this:
>
> Relationship relationship = relationshipIndex.get("signature", signature,
> lastNode, null).getSingle();
>
> If I understand the documentation correctly, this should return only the
> relationships attached to the node "lastNode" that have the value I'm
> asking for.
>
> Unfortunately, my attempt to use this function results in the following
> exception:
>
> java.lang.UnsupportedOperationException
>at
> org.neo4j.rest.graphdb.index.RestRelationshipIndex.get(RestRelationshipIndex.java:42)
>
> I'm kind of stuck at this point. Any ideas?
>
> Frank
>
> On Dec 2, 2011, at 1:59 PM, Peter Neubauer [via Neo4j Community
> Discussions] wrote:
>
> > Frank,
> > Either you could put just some of the rels into the index, or maybe have
> an
> > additional property in the index for the direction?
> >
> > /peter
> >
> > Sent from my phone, please excuse typos and autocorrection.
> > On Dec 2, 2011 8:28 PM, "Frank" <[hidden email]> wrote:
> >
> > > I'm having some trouble understanding relationship indexes.
> > >
> > > I plan to have nodes with many (hundreds, sometimes thousands) of
> > > relationships to other nodes.
> > >
> > > Give node N, I want to be able to quickly locate one of those
> relationships
> > > given a key. I want to consider only the outgoing relationships of that
> > > node, not all nodes.
> > >
> > > Can this be accomplished? The problem I'm seeing is that when I try to
> look
> > > up a relationship from a RelationshipIndex, I don't see how to limit
> that
> > > lookup to just the outgoing relationships of one node.
> > >
> > > --
> > > View this message in context:
> > >
> http://neo4j-community-discussions.438527.n3.nabble.com/Relationship-indexes-tp3555465p3555465.html
> > > Sent from the Neo4j Community Discussions mailing list archive at
> > > Nabble.com.
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> >
> http://neo4j-community-discussions.438527.n3.nabble.com/Relationship-indexes-tp3555465p323.html
> > To unsubscribe from Relationship indexes, click here.
> > NAML
>
>
>
> --
> View this message in context:
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Re: [Neo4j] Compilation Error Community Edition 1.6

[Peter Neubauer]

Gourav,
Does it work with Java 6 and maven 2?

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 4, 2011 2:03 AM, "gouravmitra"  wrote:

> Hi,
>
>  Currently, I am studying about graph databases and would like to get
> involve in this open source project. I have downloaded the community
> edition
> source code from github and trying compile using maven. I am getting
> following error
>
> */[ERROR] COMPILATION ERROR :
> [INFO] -
> [ERROR]
>
> \MyStorage\RIT\DBSI\community\kernel\src\main\java\org\neo4j\kernel\impl\transaction\DefaultTransactionManagerProvider.java:[27,0]
> error: Internal error: java.io.FileNotFoundException:
>
> META-INF/services/org.neo4j.kernel.impl.transaction.TransactionManagerProvider
> [ERROR]
>
> \MyStorage\RIT\DBSI\community\kernel\target\generated-sources\version\org\neo4j\kernel\impl\ComponentVersion.java:[6,0]
> error: Internal error: java.io.FileNotFoundException:
> META-INF/services/org.neo4j.kernel.Version
> [INFO] 2 errors /*
>
> My System has:
> OS: Win 7
> JDK: 1.7.0_01
> Maven: 3.0.3
>
> Please let me know if anybody had seen this error and what was your
> recovery?
>
> Logs are
> MVN Console:
>
> http://neo4j-community-discussions.438527.n3.nabble.com/file/n3558335/InstallLog.txt
> InstallLog.txt
> MVN Console with debug:
>
> http://neo4j-community-discussions.438527.n3.nabble.com/file/n3558335/InstallLogMaven.txt
> InstallLogMaven.txt
>
> Thank You,
> Gourav Mitra
>
> -
> Gourav Mitra
> --
> View this message in context:
> http://neo4j-community-discussions.438527.n3.nabble.com/Compilation-Error-Community-Edition-1-6-tp3558335p3558335.html
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[Neo4j] Blog entry on the Heroku screencast

[Peter Neubauer]

Hi folks,
seems people enjoyed the screencast, So I wrote a small blog post
about it, http://blog.neo4j.org/2011/12/neo4j-labs-heroku-neo4j-and-google.html
.

Thanks to Patrick for prompting this with http://tm.durusau.net/?p=18847 !

Feel free to comment with ideas on what you would like to have
screencasted and what could be improved, and maybe do one yourself
that we all can enjoy?

Cheers,

/peter neubauer

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Re: [Neo4j] Gremlin/Groovy UNIQUE + Closure support

[Peter Neubauer]

Guys,
I can include a dedup example in the gremlin plugin docs if you Romiko give
me a small nice example? Will upgrade when Gremlin 1.4 us out...

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 4, 2011 12:52 AM, "Marko Rodriguez"  wrote:

> Hi,
>
> uniqueObject is in Gremlin 1.3 and below. The online docs are for Gremlin
> 1.4 and uniqueObject is now called dedup. To see the Gremlin 1.3
> documentation, see the wiki/ directory of the distribution.
>
> HTH,
> Marko.
>
> http://markorodriguez.com
>
> On Dec 3, 2011 4:13 PM, "Romiko Derbynew" 
> wrote:
>
> Hi Marko,
>
> Thank you very much for this information, is it possible that the
> documentation will include these gremlin methods, since on the
> Gremlin-Steps page, I failed to notice any mention of UniqueObject()? I am
> now updating the .NetClient asap :) Thank you once again!
>
>
> -Original Message-
> From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org
> ]...
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Re: [Neo4j] Log message for unmanaged extension

[Peter Neubauer]

Mmh,
good question. I think they should get out into messages.log, maybe
you could raise an issue about this so we can track the missing
message down?

Cheers,

/peter neubauer

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On Fri, Dec 2, 2011 at 7:12 AM, Brendan cheng  wrote:
>
> Hi,
> I tried to debug my unmanaged extension with
> private static final Logger log = Logger.getLogger(Register.class);
> and
> generate a message like:
> log.warn("passed check point 1");
> But I couldn't find any these messages from any log files, neo4j.0.0.log, 
> console.log, message.log...etc
> How should I setup the log message?
> Regards,
> Brendan
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Re: [Neo4j] Controlling Traversal Depth with Python Neo4j Bindings

[Peter Neubauer]

Chris,
Sounds like a case for Cypher, Jake just added on support for it?

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 2, 2011 2:40 AM, "Chris Diehl"  wrote:

> Hi Jake,
>
> I have a situation where I want to start at a given node in my graph and
> traverse down a linear chain of nodes a specified # of hops. Is there a way
> for me to specify the traversal depth using the Python bindings?
> If not, what would you suggest as the best way to achieve that goal?
>
> Cheers, Chris
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Re: [Neo4j] Relationship indexes

[Peter Neubauer]

Frank,
Either you could put just some of the rels into the index, or maybe have an
additional property in the index for the direction?

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 2, 2011 8:28 PM, "Frank"  wrote:

> I'm having some trouble understanding relationship indexes.
>
> I plan to have nodes with many (hundreds, sometimes thousands) of
> relationships to other nodes.
>
> Give node N, I want to be able to quickly locate one of those relationships
> given a key. I want to consider only the outgoing relationships of that
> node, not all nodes.
>
> Can this be accomplished? The problem I'm seeing is that when I try to look
> up a relationship from a RelationshipIndex, I don't see how to limit that
> lookup to just the outgoing relationships of one node.
>
> --
> View this message in context:
> http://neo4j-community-discussions.438527.n3.nabble.com/Relationship-indexes-tp3555465p3555465.html
> Sent from the Neo4j Community Discussions mailing list archive at
> Nabble.com.
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Re: [Neo4j] Heroku, Neo4j and Google Spreadsheet in 10min. Flat.

[Peter Neubauer]

It's all in there!

/peter

Sent from my phone, please excuse typos and autocorrection.
On Dec 2, 2011 6:37 PM, "Rick Bullotta"  wrote:

> Nice! Show me how to access those services and I'll build you a killer UI
> for it using ThingWorx - in 10 minutes. ;-)
>
> -Original Message-
> From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org]
> On Behalf Of Peter Neubauer
> Sent: Friday, December 02, 2011 11:51 AM
> To: Neo4j user discussions; neo4jrb
> Subject: [Neo4j] Heroku, Neo4j and Google Spreadsheet in 10min. Flat.
>
> Hi all,
> todays lab project: http://vimeo.com/33032604
>
> Thought you might enjoy it.
>
> Cheers,
>
> /peter neubauer
>
> GTalk:  neubauer.peter
> Skype   peter.neubauer
> Phone   +46 704 106975
> LinkedIn   http://www.linkedin.com/in/neubauer
> Twitter  http://twitter.com/peterneubauer
>
> brew install neo4j && neo4j start
> heroku addons:add neo4j
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[Neo4j] Heroku, Neo4j and Google Spreadsheet in 10min. Flat.

[Peter Neubauer]

Hi all,
todays lab project: http://vimeo.com/33032604

Thought you might enjoy it.

Cheers,

/peter neubauer

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Re: [Neo4j] WADL specification is the complete reference for all HTTP interactions with Neo4j?

[Peter Neubauer]

How about extensions and plugins? Are these discovered by Jetty also?

Cheers,

/peter neubauer

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On Fri, Dec 2, 2011 at 11:55 AM, Michael Hunger
 wrote:
> http://localhost:7474/db/data/application.wadl
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Re: [Neo4j] OSMImporter: Is there a way to do incremental imports?

[Peter Neubauer]

Not sure,
Craig, do you have the code somewhere?

/peter

On Tue, Nov 22, 2011 at 4:17 PM, grimace  wrote:
> thanks for the response(s)!  The hardware I'm testing on is not the best and
> only 4G of ram so I'm limited, but this seems the best opportunity for me to
> learn this...that being said...
>
>>> For incremental imports, stitching osm files together, we re-activate the
>>> old code that tests the lucene index before adding nodes and relations.
>>> There might be some subtle edge cases to consider, but a set of tests
>>> with
>>> overlapping and non-overlapping osm files should flush them out.
>
> I'd love to play with this. Is the old code there for me to re-enable in
> testing? Or can you point me to where this might be put in?
>
> Thx,
> Greg
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/OSMImporter-Is-there-a-way-to-do-incremental-imports-tp3526941p3527995.html
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Re: [Neo4j] WADL specification is the complete reference for all HTTP interactions with Neo4j?

[Peter Neubauer]

Johnny,
at which URI si the WADL hosted? Would like to look at the code, or
you could dig into the code yourself if you don't want to wait.

Cheers,

/peter neubauer

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On Thu, Dec 1, 2011 at 1:28 AM, yobi  wrote:
> I have noticed that you provide a runtime generated WADL specification for
> the HTTP API.
>
> I'm going to create a WADL to Node.js SDK converter so I don't have to
> create the functionality and change things manually each time you have a new
> release with changes to the HTTP API.
> a
> But before I do that I wanna be sure that this WADL specification is always
> an _up to date_ spec for _all_ HTTP interactions.
>
> Could someone confirm this?
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/WADL-specification-is-the-complete-reference-for-all-HTTP-interactions-with-Neo4j-tp3550226p3550226.html
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Re: [Neo4j] Named matched with depth gives error

[Peter Neubauer]

Great.
Let us know if that is working for you.

Cheers,

/peter neubauer

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On Fri, Dec 2, 2011 at 8:08 AM, dnagir  wrote:
> Thank Michael,
>
> I didn't realise there's snapshot version available from the download page.
>
> I prefer downloading the whole package instead of one particular thing, as 
> Jim suggested.
>
> But glad to know there's such an option.
>
> Cheers.
>
> On 02/12/2011, at 5:20 PM, Michael Hunger [via Neo4j Community Discussions] 
> wrote:
>
>> download the 1.6 SNAPSHOT from neo4j.org/downloads
>>
>> mobile mail please excuse brevity and typos
>>
>> Am 02.12.2011 um 01:27 schrieb dnagir <[hidden email]>:
>>
>> >> I fixed this 
>> >> yesterday<https://github.com/neo4j/community/commit/37c2867871c7d953c2021177d0b72cd8ba825be0>.
>> >
>> > Thanks a lot for that.
>> > How can I get the build that includes the fix? (Sorry for the question, 
>> > but just starting with noe4j).
>> >
>> >> Sorry you ran into it...
>> > NP.
>> >
>> > Cheers.
>> >
>> > --
>> > View this message in context: 
>> > http://neo4j-community-discussions.438527.n3.nabble.com/Named-matched-with-depth-gives-error-tp3548195p3553337.html
>> > Sent from the Neo4j Community Discussions mailing list archive at 
>> > Nabble.com.
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>>
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>> To unsubscribe from Named matched with depth gives error, click here.
>> NAML
>
>
>
> --
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Re: [Neo4j] Neo4j Öresund meetup next Tuesday

[Peter Neubauer]

My ASCII art skills suck. I mean "square" :)

Cheers,

/peter neubauer

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On Fri, Dec 2, 2011 at 10:53 AM, Nigel Small  wrote:
> "Be there or be an empty array"? I may start saying that just to confuse
> people :-)
>
> On 2 Dec 2011 09:30, "Peter Neubauer" 
> wrote:
>
>> Everyone,
>> the next Neo4j Öresund meetup is coming up next Tuesday. I think we
>> might be able to show off some nice Heroku-Sinatra-GoogleCalc
>> integration, too, along with some NOSQL war stories and beer, so be
>> there or be [] !
>>
>> http://www.meetup.com/Neo4j-Oresund/events/42155032/
>>
>> Cheers,
>>
>> /peter neubauer
>>
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>>
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Re: [Neo4j] Standalone server and transactions

[Peter Neubauer]

Radoslaw,
if you need transactions, embedded and multiple machines, you can
always use HA to let the DB replicate between your servers.

More to the point, we have shun away from a low level API binary
protocol because of serialization overhead reasons when you do for
instance traversals transparently on the client side with the Java
API.

All this is changing with Cypher, that lets you transfer declarative
statements to the server. The missing piece now is the support for
modifying operations - either via mutating diff statements or
in-Cypher mutating support. Then, the binary protocol will be
feasible.

Got any input on how you would prefer this?

Cheers,

/peter neubauer

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On Fri, Dec 2, 2011 at 10:38 AM, zolv  wrote:
> Anyway, You are talking now about things that doesn't exist and I have to
> implement them on my own.
>
> I can't imagine RDBMS server that doesn't give me JDBC driver in the box.
> Unfortunately Neo4j is like this. There is no native transaction-full
> support so Neo4j can work as standalone server with many connections to it.
> And that's the point.
>
> Now I have to choose one of the:
> - Neo4j as standalone server with REST without transactions
> or
> - Neo4j embedded with only 1 connection with transactions.
>
> I can't imagine the situation where DB server is embedded in application
> (really big application) which allows 1 connection (not 2, not many, but
> 1!). There is no possibility to have separated machine for DB because then
> there is no transactions. Transactions in meaning the "core" of persisting
> data doesn't exist in DBMS...I'm amazed that nobody has thought about these
> as a "bottleneck problem".
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/Standalone-server-and-transactions-tp3553058p3554188.html
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[Neo4j] Neo4j Öresund meetup next Tuesday

[Peter Neubauer]

Everyone,
the next Neo4j Öresund meetup is coming up next Tuesday. I think we
might be able to show off some nice Heroku-Sinatra-GoogleCalc
integration, too, along with some NOSQL war stories and beer, so be
there or be [] !

http://www.meetup.com/Neo4j-Oresund/events/42155032/

Cheers,

/peter neubauer

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Re: [Neo4j] REST API - always batch?

[Peter Neubauer]

Dmytri,
sounds like an interesting plan! I don't think there is anything
directly that I can see, except a bug,
https://github.com/neo4j/community/issues/113 with "\\" which you
might watch our for, reported by Josh Adell.

Let us know how it works out!

Cheers,

/peter neubauer

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On Thu, Dec 1, 2011 at 5:53 AM, Dmytrii Nagirniak  wrote:
> Hi,
>
> I wonder what the disadvantages would be if every request to the server would 
> always be a batch (even for simple GETs)?
>
> This would make it easier to use the API from the application.
>
> How bad is this idea?
>
> Cheers,
> Dima
> http://www.ApproachE.com
>
>
>
>
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Re: [Neo4j] Neo4j Spatial build / run problems

[Peter Neubauer]

Daniel,
glad to hear it works out! I think we need to make the loading of the
index more robust, so the order is less important. Feel free to
suggest improvements on that, and make some more tests for it.

Also, keep us informed on how your project is going. Maybe a small
blog is in order to show off?

Cheers,

/peter neubauer

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On Wed, Nov 30, 2011 at 3:04 PM, danielb  wrote:
> Now I missed another important point:
> With that settings the database would still not return any results. I
> changed the bounding box values to 9.9 and 48.4. I then got an error message
> with insufficient heap space. With more digits it would load even more from
> the R-tree.
> I increased the cache sizes from the standard few megabytes to several
> hundreds of megabytes and now can do the queries. (600k nodes, 1M
> properties, 1M relationships)
>
> --
> View this message in context: 
> http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-Spatial-build-run-problems-tp3515519p3548384.html
> Sent from the Neo4j Community Discussions mailing list archive at Nabble.com.
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[Neo4j] Moving to u...@neo4j.org

[Peter Neubauer]

Hi all,
we are going to move from mailman to google groups,
http://groups.google.com/a/neo4j.org/groups/dir soon, I just wanted to
give you a heads-up that I will invite add of the current members to
http://groups.google.com/a/neo4j.org/group/user/topics?lnk when we are
ready.

Just wanted to warn you that there might be a surprising welcome
message from that group soonish, hope you don't mind!

Let me know if you have any objections.

Happy hacking!

/peter neubauer

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Re: [Neo4j] How to return the start nodes of all the paths with Cypher

[Peter Neubauer]

Well,
in Gremlin, it is basically scripting, so you would probably do a loop
and follow the pattern until you are at the right depth, see
http://docs.neo4j.org/chunked/snapshot/gremlin-plugin.html#rest-api-flow-algorithms-with-gremlin
for a flow algo that loops until the target node = sink, without any
hard limitation.

Cheers,

/peter neubauer

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On Wed, Nov 30, 2011 at 11:46 AM, Andres Taylor
 wrote:
> On Wed, Nov 30, 2011 at 11:32 AM, dnagir  wrote:
>
>> I would probably like to write something among these lines (it's not valid
>> query of course):
>>
>>
>> START s=node(10)
>> MATCH p = s<-[:whatever]-t
>> RETURN t, LENGTH(p) as len
>> HAVING len >= MAX( LENGTH(p) )
>>
>
> Well, this query would also return 'b' in the example you shared above. I
> think we need something that says "follow this path until you can't follow
> it any more". If you're working with a B-tree, you should be able to say
> "given this sub-root, give me all leafs". Something like:
>
> START c = node(17)
> MATCH x<-[*END]-c
> RETURN x
>
> I really don't like this syntax, but I think the information belongs in
> there somewhere...
>
> Seems like clause similar to SQL HAVING is missing.
>>
>> It doesn't "exactly" reflect what I want but just thought from top of my
>> head.
>>
>> So currently I have to use other query language if I want to do this.
>> Right?
>
>
> A traversal would do it pretty simply. Maybe someone else can share a
> end-of-graph traversal example?
>
> I'm sure Gremlin can do it as well. Don't know how to do it in Gremlin
> though - Peter, Marko?
>
> Andrés
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Re: [Neo4j] Id capacity exceeded

[Peter Neubauer]

Alfredas,
AFAIK there is a limit on the number of Relationship types is max
32000 in the cache layer, a bit higher in the storage layer. Mattias
has been doing a branch for more in order to support Rene Pickhard in
his Activity Stream algo that uses types heavily, see
http://www.rene-pickhardt.de/data-structure-for-social-news-streams-on-graph-data-bases/
but that is not in master.

So, I think a property on the relationships is a better way to go right now.

Also updated the docs to reflect this, see
https://github.com/neo4j/manual/commit/796ef8d2e3bf99df7410f53e37860296e6b616c6

Cheers,

/peter neubauer

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On Tue, Nov 29, 2011 at 6:58 PM, Alfredas Chmieliauskas
 wrote:
> Dear all,
>
> after creating some relations i get the error
> org.neo4j.kernel.impl.nioneo.store.UnderlyingStorageException: Id
> capacity exceeded
> See trace below.
>
> I have to create around 1m relations. Out of those there are 100'000
> different types of relations. Probably the number of relation types
> this is the cause of the problem. Alternatively I could create 1 type
> of relation but add a property to identify them. I just want to be
> sure about the cause of the error and if there are any configurable
> ways to get around it...
>
> Alfredas
>
> org.neo4j.kernel.impl.nioneo.store.UnderlyingStorageException: Id
> capacity exceeded
>        at 
> org.neo4j.kernel.impl.nioneo.store.IdGeneratorImpl.assertIdWithinCapacity(IdGeneratorImpl.java:170)
>        at 
> org.neo4j.kernel.impl.nioneo.store.IdGeneratorImpl.nextId(IdGeneratorImpl.java:161)
>        at 
> org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.nextId(CommonAbstractStore.java:393)
>        at 
> org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource.nextId(NeoStoreXaDataSource.java:428)
>        at 
> org.neo4j.kernel.impl.nioneo.xa.NioNeoDbPersistenceSource.nextId(NioNeoDbPersistenceSource.java:111)
>        at 
> org.neo4j.kernel.impl.persistence.IdGenerator.nextId(IdGenerator.java:43)
>        at 
> org.neo4j.kernel.impl.core.DefaultRelationshipTypeCreator$RelTypeCreater.run(DefaultRelationshipTypeCreator.java:98)
> org.neo4j.graphdb.TransactionFailureException: Unable to create
> relationship type 4791005
>        at 
> org.neo4j.kernel.impl.core.DefaultRelationshipTypeCreator.getOrCreate(DefaultRelationshipTypeCreator.java:58)
>        at 
> org.neo4j.kernel.impl.core.RelationshipTypeHolder.createRelationshipType(RelationshipTypeHolder.java:142)
>        at 
> org.neo4j.kernel.impl.core.RelationshipTypeHolder.addValidRelationshipType(RelationshipTypeHolder.java:81)
>        at 
> org.neo4j.kernel.impl.core.NodeManager.createRelationship(NodeManager.java:289)
>        at 
> org.neo4j.kernel.impl.core.NodeImpl.createRelationshipTo(NodeImpl.java:495)
>        at 
> org.neo4j.kernel.impl.core.NodeProxy.createRelationshipTo(NodeProxy.java:197)
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Re: [Neo4j] New Bug Logged - Gremlin 114

[Peter Neubauer]

Thanks Romiko,
will look into it first time when I have time. How critical is it for you?

Cheers,

/peter neubauer

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On Wed, Nov 30, 2011 at 1:31 AM, Romiko Derbynew
 wrote:
> Hi,
>
> New bugged logged at: https://github.com/neo4j/community/issues/114
>
> Details below for others to peruse.
>
> Gremlin Table Projections - Column Order Incorrect when using chained 
> .As('x').As('y')
>
> EXPECTED Order: Createdy, ReferralGroup, ReferralId, ReferralData
>
> When AS statements appear next to each other.
> Consider A (WORKS - But not logical - have to reverse order when more than 1 
> AS statement is chained together right after each other for column array to 
> match):
> {"script":"g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency' 
> }.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username == 
> 'romiko.derbynew' 
> }.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralDate').as('ReferralId').table(new
>  Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap"
> }
>
> notice: as('ReferralDate').as('ReferralId') and then notice the column order 
> below is opposite this: "columns"  "ReferralId", "ReferralDate" ]
>
> Results
> [ [ {
> "data" : [ [ "romiko.derbynew", "Testa", 331, "/Date(1322007153048+1100)/" ], 
> [ "romiko.derbynew", "Testa", 321, "/Date(1322003375637+1100)/" ]],
> "columns" : [ "CreatedBy", "ReferralGroup", "ReferralId", "ReferralDate" ]
> } ] ]
>
>
> Consider B (Does not work - this is more LOGICAL from gremlin perspective but 
> is bugged, the Chained AS right after each other gets reversed in the column 
> array.)
> {"script":"g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency' 
> }.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username == 
> 'romiko.derbynew' 
> }.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralId').as('ReferralDate').table(new
>  Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap"
> }
>
> Notice: .as('ReferralId').as('ReferralDate') and then the columns "columns" 
>  "ReferralDate", "ReferralId" ]
>
> Results
> [ [ {
> "data" : [ [ "romiko.derbynew", "Testa", 331, "/Date(1322007153048+1100)/" ]],
> "columns" : [ "CreatedBy", "ReferralGroup", "ReferralDate", "ReferralId" ]
> } ] ]
>
>
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Re: [Neo4j] py2neo - GEOFF enhancements

[Peter Neubauer]

That sounds great! Let me know when you are stable, and I will see if
I can do some more on the server plugin side, so we can shoot in
things there!

Cheers,

/peter neubauer

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On Mon, Nov 28, 2011 at 9:52 PM, Nigel Small  wrote:
> Hi Peter
>
> Bulk of the work is now done on the Java version of the GEOFF enhancements.
> There have been some significant changes to the classes and a number of
> extra tests inserted. The signature of the load method has now been
> extended to:
>
> public static Neo4jNamespace loadIntoNeo4j(Reader reader,
> GraphDatabaseService graphDB, Map
> hooks)
>
> ...where the final parameter expects a Map full of names
> Nodes/Relationships which may then be referenced from within the GEOFF
> source.
>
> Let me know how you get on and give me a shout if I've forgotten anything
> :-)
>
> Cheers
>
> Nige
>
> *Nigel Small*
> Phone: +44 7814 638 246
> Blog: http://nigelsmall.name/
> GTalk: ni...@nigelsmall.name
> MSN: nasm...@live.co.uk
> Skype: technige
> Twitter: @technige <https://twitter.com/#%21/technige>
> LinkedIn: http://uk.linkedin.com/in/nigelsmall
>
>
>
> On 23 November 2011 10:12, Peter Neubauer  wrote:
>
>> Looks great to me Nigel! I think this is a very good first step on
>> parameters. Let me know when you are done with the Java code, would
>> like to bring this into the @Graph annotations after our next
>> milestone release, 1.6.M01.
>>
>> /peter
>>
>> On Tue, Nov 22, 2011 at 10:14 PM, Nigel Small 
>> wrote:
>> > Hi all
>> >
>> > I have just completed a set of GEOFF enhancements within py2neo (as yet
>> > only available from GitHub). Named parameters (hooks) and composite
>> > descriptors are now supported, please see the following sample file for
>> an
>> > illustration of the new capabilites:
>> >
>> >
>> https://github.com/nigelsmall/py2neo/blob/master/src/py2neo-examples/geoff/node-hooks.geoff
>> >
>> > In addition, a change has been made for index entries to use |foo| syntax
>> > instead of {foo} syntax as previously (although the old syntax will still
>> > work for now).
>> >
>> > Finally, there is a new wiki page detailing the current format in full:
>> >
>> > https://github.com/nigelsmall/py2neo/wiki/GEOFF
>> >
>> > I will now start planning the set of work required for the neo4j-geoff
>> > project to bring that up to the same level.
>> >
>> > Cheers
>> >
>> > Nige
>> >
>> > *Nigel Small*
>> > Phone: +44 7814 638 246
>> > Blog: http://nigelsmall.name/
>> > GTalk: ni...@nigelsmall.name
>> > MSN: nasm...@live.co.uk
>> > Skype: technige
>> > Twitter: @technige <https://twitter.com/#!/technige>
>> > LinkedIn: http://uk.linkedin.com/in/nigelsmall
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Re: [Neo4j] Contributors section in the manual

[Peter Neubauer]

Right now,
nothing. I took it from the GIThub API and reformatted it. Maybe date
of first commit would be good?

Cheers,

/peter neubauer

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On Tue, Nov 29, 2011 at 3:47 PM, Craig Taverner  wrote:
> What is the sort order? Date of first commit, number of lines, commits,
> packages?
> On Nov 21, 2011 2:35 PM, "Peter Neubauer" 
> wrote:
>
>> Everyone,
>> have started to put in some random people in, see
>> http://docs.neo4j.org/chunked/snapshot/contributors.html .
>>
>> Any ideas what more info to provide here, or how to make this nicer?
>>
>> Cheers,
>>
>> /peter neubauer
>>
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>>
>> http://www.neo4j.org              - NOSQL for the Enterprise.
>> http://startupbootcamp.org/    - Öresund - Innovation happens HERE.
>>
>>
>>
>> On Sun, Nov 13, 2011 at 10:42 AM, Peter Neubauer
>>  wrote:
>> > To start with,
>> > The manual is for the direct codebase that is part of the distribution.
>> The
>> > next step is to include sections and pointers to other stable related
>> > projects and drivers.
>> >
>> > Does that sound reasonable?
>> >
>> > On Nov 13, 2011 1:36 AM, "Nigel Small"  wrote:
>> >>
>> >> Are you looking for info on associated projects like py2neo or direct
>> >> contributions to the main code base?
>> >>
>> >> On a side note, I've been getting quite a few hits to my blog post on
>> >> pagination in Neo4j. The bits I wrote for that are all Python/py2neo
>> again
>> >> but that or something similar might be worth including somewhere on the
>> >> Neo
>> >> site as it appears to be a reasonably sought-after topic.
>> >>
>> >> Cheers
>> >>
>> >> *Nigel Small*
>> >> Phone: +44 7814 638 246
>> >> Blog: http://nigelsmall.name/
>> >> GTalk: ni...@nigelsmall.name
>> >> MSN: nasm...@live.co.uk
>> >> Skype: technige
>> >> Twitter: @technige <https://twitter.com/#!/technige>
>> >> LinkedIn: http://uk.linkedin.com/in/nigelsmall
>> >>
>> >>
>> >>
>> >> On 12 November 2011 20:40, Peter Neubauer
>> >> wrote:
>> >>
>> >> > Hi guys,
>> >> > I would love to add a section on contributors to the Neo4j Manual, in
>> >> > http://docs.neo4j.org/chunked/snapshot/community.html so that all of
>> >> > you that participate in the process can be found in there.
>> >> >
>> >> > Do you have any suggestions on how to present this, that is - what
>> >> > info, links and maybe a short presentation snippets and pictures?
>> >> > Graph to components or simply a table?
>> >> >
>> >> > Thoughts?
>> >> >
>> >> > Cheers,
>> >> >
>> >> > /peter neubauer
>> >> >
>> >> > GTalk:      neubauer.peter
>> >> > Skype       peter.neubauer
>> >> > Phone       +46 704 106975
>> >> > LinkedIn   http://www.linkedin.com/in/neubauer
>> >> > Twitter      http://twitter.com/peterneubauer
>> >> >
>> >> > http://www.neo4j.org              - NOSQL for the Enterprise.
>> >> > http://startupbootcamp.org/    - Öresund - Innovation happens HERE.
>> >> > ___
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Re: [Neo4j] cypher question - subqueries possible?

[Peter Neubauer]

Very cool Johann.
Mind writing this into a short blog post? Would love to see this code
and some short illustration on this, even for others to learn from it
...

Cheers,

/peter neubauer

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On Tue, Nov 29, 2011 at 1:59 PM, jschweigl  wrote:
> Thanks for all the replies. To explain what I am doing: I'm harvesting
> information from the software engineering tool some guys here are using:
> Excel (gawk!). Excel sheets are parsed and converted to graphs,
> incrementally enriched with properties as I digest subsequent sheets so that
> at the end I get a database of everything which I intend to use for export
> into something useful like Enterprise Architect from Sparx.
>
> The queries I write should do some kind of QA, showing inconsistencies
> introduced by typos in the sheets or incorrect parsing of free text in the
> cells. The model excerpt we are looking at is
>
> http://neo4j-community-discussions.438527.n3.nabble.com/file/n3545086/mockups.png
>
> There are some phenomena I do not understand regarding the query syntax and
> the resulting nodes:
>
> - Query 6 lists all mockups with no relations: 27 items, fine
> - Query 7 lists all mockups linked to a scenario but not linked to any
> subprocess: 53
> - Query 8 lists all mockups linked to a subprocess but not linked to any
> scenario: 53. Exactly the same ones
> - Query 9 lists all mockups linked to both at least one subprocess and
> scenario: 53. Again, exactly the same ones
>
> Query 10 and 11 are the same as 9 and 10, but written according to the hints
> from the forum.
> - Query 10 returns no nodes, which I believe is correct, at least according
> to an overview supplied with the Excel sheet and a few random samples
> - Query 11 returns a node with _id and mockupName being  - huh? I'm
> using a quickly hacked POJO mapping layer. jo4neo only works up to neo 1.4
> so I came up with my own which does the absolute minimum I needed for the
> job, but as _id is the primary key, I'm pretty sure I don't store such
> nodes. A bug is always possible, but
> - Query 19 lists all mockup nodes and there is no one with  in both
> fields.
>
> The math: there are 27 unlinked nodes, queries 7, 8, and 9 retrieve the very
> same 53 nodes which I believe to be linked to both scenarios and
> subprocesses so either the query or the result must be wrong and query 19
> delivers a total of 80 nodes. 27 + 53 = 80.
>
> As I already said I'm not familiar with neo and cypher yet, but I do not see
> the semantic difference between queries 7 and 8 vs. 10 and 11, yet the
> results differ significantly, and this even between 10 and 11.
>
> As an overview, here are the queries and the (shortened) output:
>
>
> 6: Unused mockups
> START mock=node:nodeIndex(_simpleType = 'Mockup') MATCH
> ()-[r?:HAS_MOCKUP]->mock WHERE r IS NULL RETURN distinct mock._id,
> mock.mockupName ORDER BY mock.mockupName
> ++
> | mock._id                             | mock.mockupName |
> ++
> | e80cdb81-9283-3279-9ec4-1c27ace2a3fd | K01-05          |
> | 5095c15a-3230-3b5a-aa03-acd45057470b | K01-07-0        |
>  ...
> | 6ba433d8-5989-399a-b463-8a088eafe756 | P2-P04-8-2      |
> | b3209a20-2081-3444-9047-4615bc6b95b3 | RAO-4-2         |
> ++
> 27 rows, 37 ms
>
> 7: Mockup linked to scenario not used by any subprocess
> START scenario=node:nodeIndex(_simpleType = 'Scenario'),
> sub=node:nodeIndex(_simpleType = 'Subprocess') MATCH
> scenario-[:HAS_MOCKUP]->mock<-[r?:HAS_MOCKUP]-sub WHERE r IS NULL RETURN
> distinct mock._id, mock.mockupName ORDER BY mock.mockupName
> ++
> | mock._id                             | mock.mockupName |
> ++
> | 81a05542-99b2-3672-8498-a31770562416 | K00-1-1         |
> | 7bc08fcc-6380-3ba3-810c-b61d85e9d5d4 | K00-2-2         |
>  ...
> | 0adf74e4-b28f-3301-b903-c65697129c24 | P2-P05-2-1      |
> | 4db08241-c9d7-3ac4-a453-6e8b5957efdb | P2-P05-2-2      |
> ++
> 53 rows, 739 ms
>
> 8: Mockup linked to subprocess not used by any scenario
> START scenario=node:nodeIndex(_simpleType = 'Scenario&#x

Re: [Neo4j] cypher question - subqueries possible?

[Peter Neubauer]

Johan,
got a graph picture on this?

Cheers,

/peter neubauer

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On Mon, Nov 28, 2011 at 11:48 PM, jschweigl wrote:

> Hi all,
>
> I have three kinds of nodes A, B and C. Both type A and B (distinguished by
> a property) have a relationship of the same type to node type C. I want to
> find nodes C which have a relationship to A but not to B.
>
> The only idea I came up with is to have a query return all A nodes having a
> relationship to C as a START nodeset and then count B nodes having a
> relationship to the nodes from the set with count 0. But as START only
> accepts node id or index queries, that's not possible.
>
> Do you plan to include set operations in cypher? UNION and INTERSECTION of
> query results would also be an approach.
>
> Or, even better, is there a solution using current language features? I'm
> still quite new to the topic, so I might have missed something.
>
> --
> View this message in context:
> http://neo4j-community-discussions.438527.n3.nabble.com/cypher-question-subqueries-possible-tp3543685p3543685.html
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[Neo4j] Contributors page extended

[Peter Neubauer]

Hi all,
following my earlier post, now the list of contributors has been expended
to the GIThub-listed contributors to Neo4j-community,
http://docs.neo4j.org/chunked/snapshot/contributors.html

Thank you all! I will look through and list everyone that has contributed
to any of the core distribution projects, even before we moved to GIThub.
As time goes, i think we should expand this to anyone who has sent in the
CLA.

Anything you think should be on that documentation page? Would be nice to
flesh it out a bit ...

Cheers,

/peter neubauer

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Re: [Neo4j] Securing scripting in the server

[Peter Neubauer]

Oh man,
that were times! Good point, will see if this is usable. Thanks a lot for
the hint!

Cheers,

/peter neubauer

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On Mon, Nov 28, 2011 at 6:41 PM, Marko Rodriguez wrote:

> Hi Peter,
>
> > Now, the question is if any of you has some experience tweaking the Java
> > Security Manager to remove System.exit, File write permissions and other
> > bad stuff from that code. Would love to see some examples of real-life
> > securing JSR232 script engines. Or are there other mechanisms that work
> > better than
> >
> http://docs.oracle.com/javase/tutorial/essential/environment/security.htmlfor
> > this type fo task?
>
> Remember you, me, and Josh worked on LinkedProcess a few years back (
> http://xmpp.org/extensions/inbox/lop.html ). Given that any random user
> on the web could execute arbitrary code on another users machines, we had
> to solve the "security hole" problem. In our Java-based reference
> implementation LoPSideD, we tweaked the JVM such that arbitrary JSR223 code
> does not violate particulate security constraints. See:
>
>
> https://github.com/tinkerpop/tinkubator/blob/master/lopsided/lopsided-farm/sweden_countryside.properties
>
> and...
>
>
> https://github.com/tinkerpop/tinkubator/blob/master/lopsided/lopsided-farm/src/main/java/org/linkedprocess/farm/Farm.java#L189
>
> ...the full codebase is in the Tinkubator at this location:
>https://github.com/tinkerpop/tinkubator/tree/master/lopsided
>
> In short, I believe that this was all set at the thread-level -- ?? --
> however, Josh was the one who did the work on security so you might want to
> ask him.
>
> Hope that gives you some starting points,
> Marko.
>
> http://markorodriguez.com
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Re: [Neo4j] Neo4j Spatial build / run problems

[Peter Neubauer]

Daniel,
there is now
https://github.com/neo4j/spatial/blob/master/src/test/java/org/neo4j/gis/spatial/SpatialPluginFunctionalTest.java#L53executing
a cypher spatial query over REST, could you check this out and
try to run it? If it works, you can simply analyze what goes over the wire
- I guess there needs to be some escaping foo when you use CURL for this.

Let me know how it works out!

On Mon, Nov 28, 2011 at 5:09 PM, danielb  wrote:

> Hi Peter,
>
> that works, yes! But I still can't do spatial queries with the OSMLayer
> over
> the server page. Today I have written a small test program in Java which
> also includes a bbox query for a specific point and then traverses to the
> corresponding OSM node. So far I am satisfied with that (I will also
> continue in Java), maybe you can still get this 'issue' to work at your
> side
> - or I just don't get it :)
>
> Regards, Daniel
>
> --
> View this message in context:
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[Neo4j] Securing scripting in the server

[Peter Neubauer]

Hi all awesome Java hackers,

I have a question:

When putting demo and trial systems online, one should watch out for people
doing bad stuff. In our case, I think the biggest security holes are the
scripting execution points:

- Neo4j Shell webadmin console (has a groovy execution command)
- Gremlin script execution (Groovy)
- Neo4j REST traversal Javascript evaluator bodies (Rhino)
-


Now, the question is if any of you has some experience tweaking the Java
Security Manager to remove System.exit, File write permissions and other
bad stuff from that code. Would love to see some examples of real-life
securing JSR232 script engines. Or are there other mechanisms that work
better than
http://docs.oracle.com/javase/tutorial/essential/environment/security.htmlfor
this type fo task?

Thanks a lot for any hints!

Cheers,

/peter neubauer

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Re: [Neo4j] path finding using OSM ways

[Peter Neubauer]

Daniel,
di you get things up and running so far? Then we can get to this next stage
...

Cheers,

/peter neubauer

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On Mon, Nov 28, 2011 at 3:22 PM, danielb  wrote:

> Hi together,
>
> Maybe I am bit late on this topic but how is the progress so far?
>
> Greetz, Daniel
>
> --
> View this message in context:
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Re: [Neo4j] Nested/ chained queries

[Peter Neubauer]

Lasse,
for Java, you might even look at
http://docs.neo4j.org/chunked/snapshot/tutorials-java-embedded-traversal.html#_new_traversal_frameworkto
get some inspiration ...

Cheers,

/peter neubauer

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On Mon, Nov 28, 2011 at 10:16 AM, lassewesth  wrote:

>
> maxdemarzi wrote
> >
> > nodes = @neo.traverse(node1,
> >   "nodes",
> >   {"order" => "breadth first",
> >"uniqueness" => "node global",
> >"relationships" => [{"type"=> "friends",
> > "direction" => "out"},
> >{"type"=> "likes",
> > "direction" => "out"}],
> > "return filter" => {
> > "language" => "javascript",
> > "body" => "position.length()
> > == 2 && position.lastRelationship().getType().name() == 'likes';"},
> >"depth" => 2})
> >
>
> Max, excellent explanation, thanks. I'll get busy translating that into
> Java.
>
> --
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Re: [Neo4j] google n grams data set in neo4j

[Peter Neubauer]

Seriously cool stuff René!

I would love to hear more as the project progresses! Also, maybe the
dataset could be added to the example dataset collection for playing around
with neo4j? WDYT?

Cheers,

/peter neubauer

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2011/11/27 René Pickhardt 

> Hey Everyone,
>
> I am curently advising two high school students for a programing project
> for some german student competition.
>
> They have inserted the German google n-gram data set several GB of natural
> language to a neo4j data base and used this to make sentence prediction to
> improve typing speed.
>
> The entire project is far from being complete but there is some code
> available on how we modelled n-grams in neo4j and what we used for
> prediction
>
> Both approaches very basic and as you would expect them. Still they already
> work in a decent way showing again the power of neo4j.
>
> We would be happy for some feedback thoghts and suggestions for further
> improvement. Find more info in my blog post:
>
> http://www.rene-pickhardt.de/download-google-n-gram-data-set-and-neo4j-source-code-for-storing-it/
>
> or in the source code:
>
> http://code.google.com/p/complet/source/browse/trunk/Completion_DataCollector/src/completion_datacollector/Main.java?spec=svn64&r=64
>
> by the way. even though the code is just hacked down it uses hashmaps to
> store nodes in memory and increase inserting speed. and builds the lucene
> index later. Of course it would be even better to use the batch inserter.
>
> best regards René
> --
> --
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>
> Skype: +49 (0)6131 / 4958926
>
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Re: [Neo4j] spaces in entity properties?

[Peter Neubauer]

http://docs.neo4j.org/chunked/snapshot/query-return.html#return-identifier-with-uncommon-characters

Cheers,

/peter neubauer

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On Mon, Nov 28, 2011 at 8:58 AM, Nigel Small  wrote:

> Assuming Cypher then simply use backticks:
>
> WHERE person.`my age` < 30 and person.`last name` = 'Luu'
>
>
> *Nigel Small*
> Phone: +44 7814 638 246
> Blog: http://nigelsmall.name/
> GTalk: ni...@nigelsmall.name
> MSN: nasm...@live.co.uk
> Skype: technige
> Twitter: @technige <https://twitter.com/#%21/technige>
> LinkedIn: http://uk.linkedin.com/in/nigelsmall
>
>
>
> On 28 November 2011 06:40, yobi  wrote:
>
> > That is great!
> >
> > Just a quick question:
> >
> > How do I use spaces in the queries?
> >
> > eg
> >
> > WHERE person.my age < 30 and person.last name = 'Luu'
> >
> > Johnny
> >
> > On Mon, Nov 28, 2011 at 7:29 AM, Peter Neubauer [via Neo4j Community
> > Discussions]  wrote:
> >
> > > You should be able to use any string including spaces as a property
> key.
> > > If
> > > you encounter problems then that is probably a bug.
> > >
> > > /peter
> > >
> > > Sent from my phone, please excuse typos and autocorrection.
> > > On Nov 28, 2011 6:33 AM, "yobi" <[hidden email]<
> > http://user/SendEmail.jtp?type=node&node=3541459&i=0>>
> > > wrote:
> > >
> > > > Is it possible to have spaces in entity properties eg.
> > > >
> > > > first name: "Foo Bar"
> > > > native language: "Baz"
> > > >
> > > > or do I have to use:
> > > >
> > > > first_name: "Foo Bar"
> > > > native_language: "Baz"
> > > >
> > > > Thanks!
> > > >
> > > > --
> > > > View this message in context:
> > > >
> > >
> >
> http://neo4j-community-discussions.438527.n3.nabble.com/spaces-in-entity-properties-tp3541413p3541413.html
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> > > below:
> > >
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> >
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> > >  To unsubscribe from spaces in entity properties?, click here<
> >
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> > >
> > > .
> > > NAML<
> >
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Re: [Neo4j] spaces in entity properties?

[Peter Neubauer]

You should be able to use any string including spaces as a property key. If
you encounter problems then that is probably a bug.

/peter

Sent from my phone, please excuse typos and autocorrection.
On Nov 28, 2011 6:33 AM, "yobi"  wrote:

> Is it possible to have spaces in entity properties eg.
>
> first name: "Foo Bar"
> native language: "Baz"
>
> or do I have to use:
>
> first_name: "Foo Bar"
> native_language: "Baz"
>
> Thanks!
>
> --
> View this message in context:
> http://neo4j-community-discussions.438527.n3.nabble.com/spaces-in-entity-properties-tp3541413p3541413.html
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Re: [Neo4j] Invalid JSON Issue

[Peter Neubauer]

Thanks for the great issue report, will look at it asap.

/peter

Sent from my phone, please excuse typos and autocorrection.
On Nov 28, 2011 3:04 AM, "Romiko Derbynew" 
wrote:

> Hi,
>
> Ticket opened
>
> https://github.com/neo4j/community/issues/110
>
> Details:
>
> When I try run this query via rest.
> {"script":"g.v(0).out('HOSTS').filter{ it.Key ==
> 'romikoagency'}.in('USER_BELONGS_TO').as('username').as('userGivenName').out('USER_LINKED_TO_PROGRAM').as('program').table(new
> Table()){it.Username}{it.GivenName}{it.Name}.cap"
> }
>
> Notice the combination of table and cap. I get this result in the raw HTTP
> response.
> [ "[[userGivenName:romiko.derbynew, username:Romiko, program:Testa],
> [userGivenName:romiko.derbynew, username:Romiko, program:Zumba Lessons],
> [userGivenName:romiko.derbynew, username:Romiko, program:Counselling],
> [userGivenName:romiko.derbynew, username:Romiko, program:Counselling],
> [userGivenName:romiko.derbynew, username:Romiko, program:After Care]]" ]
>
> The above JSON result is invalid, should it be?:
> [
> {"userGivenName":"romiko.derbynew", "username":"Romiko",
> "program":"Testa"},
> {"userGivenName":"romiko.derbynew", "username":"Romiko", "program":"Zumba
> Lessons"}, {"userGivenName":"romiko.derbynew", "username":"Romiko",
> "program":"Counselling"},
> {"userGivenName":"romiko.derbynew", "username":"Romiko",
> "program":"Counselling"},
> {"userGivenName":"romiko.derbynew", "username":"Romiko", "program":"After
> Care"}
> ]
>
> We have extended the Neo4jClient to now support table projections and cap
> combo, however, the JSON deserialization is broken due to the invalid json
> results.
>
> Kind Regards
> Romiko
>
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Re: [Neo4j] Network accessible hostname

[Peter Neubauer]

Done, see https://github.com/neo4j/community/issues/46

Cheers,

/peter neubauer

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On Sat, Nov 26, 2011 at 1:45 AM, Jim Webber  wrote:

> Hi Peter,
>
> I think I might have verbally volunteered for this issue.
>
> Can you assign it to me? Email would help me to remember :-)
>
> Jim
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Re: [Neo4j] Activity Streams and Twitter Sample App

[Peter Neubauer]

Rene,
you mean the fork that Mattias has been providing you with for handling
millions of relationship types? It is possible to take that into master,
however, I think Johan said we need to test and make sure all cases are
covered. Don't have an ETA on that ATM. I think you could raise an issue
and point to Mattias branch to keep track of the feature!

Cheers,

/peter neubauer

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2011/11/26 René Pickhardt 

> @ qcon: I can't find the twitter videos on
> http://qconlondon.com/london-2011/ rick could you please point to further
> rescources?
>
> @ aseem: I gave a detailed answer to your questions on
>
> http://www.rene-pickhardt.de/graphity-an-efficient-graph-model-for-retrieving-the-top-k-news-feeds-for-users-in-social-networks/#comment-1295
>
> but I think we have the same oppinion. The approach that you wrote down
> here is exactly what my baseline STOU does. you have your friendship
> relations as a (S)tar and the events as (T)emporal (O)rdered (U)pdeats ( =
> STOU ) The merging traversal is the same in STOU and Graphity. The only
> difference is that in STOU I have to sort the egonetwork O(d log d) where d
> is infact the outdegree.
>
> Once we understand this everything else is easy: You look at your kind of
> application and decide what your ratio of read to write operations is. Once
> reading happens far more frequently you better use graphity in the other
> case your method seems more sufficiant.
>
> What I have learnt from your comments that not only the ratio of reads to
> writes is interesting but the distribution of outdegrees should be
> considered when deciding which algorithm to use.. If the outdegree really
> stays small your approach will be more efficiently.
>
> @maxdemermazi:
> performance with bigger k drops in both cases. retrieval with graphity is
> O(k log k) where STOU is O(d log d + k log k) and for small k the d part is
> just dominating. So what's happening here is that graphity will always be
> faster since no sorting of the egonetwork is involved.
> Besides. Why would you want to have such a big k. Even if your twitter
> stream genereated that many updates when you come to the website you will
> only get to see a small k of them and as soon as you scroll down you will
> see the next k + l tweets...
>
> @custom neo4j: well let's ask Peter if neotechnology will include support
> to handle that many relationship types again to neo4j. I certainly would be
> happy about that.
>
> 2011/11/22 maxdemarzi 
>
> > A couple of things bothered me about Rene's approach.
> >
> > 1. Custom Neo4j that could handle lots of relationship types.  Not 100%
> > sure
> > where this fits?
> > 2. Performance drops like a bomb when K (the number of items retrieved)
> > increases.
> >
> > So it kind of works to get the top 15 items... A twitter stream could
> have
> > 500 items easy per update (on my iphone every few hours).
> >
> >
> >
> > --
> > View this message in context:
> >
> http://neo4j-community-discussions.438527.n3.nabble.com/Activity-Streams-and-Twitter-Sample-App-tp3477669p3526543.html
> > Sent from the Neo4j Community Discussions mailing list archive at
> > Nabble.com.
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Re: [Neo4j] Nested/ chained queries

[Peter Neubauer]

nice Max,
thanks for the follow-up!

Cheers,

/peter neubauer

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On Sun, Nov 27, 2011 at 12:49 AM, maxdemarzi  wrote:

> Sure, it's like getting friends of friends:
> https://github.com/maxdemarzi/neography/blob/master/examples/facebook.rb
>
> This should work, but I haven't tested it, so keep an eye out for typos.
>
> nodes = @neo.traverse(node1,
>  "nodes",
>  {"order" => "breadth first",
>   "uniqueness" => "node global",
>   "relationships" => [{"type"=> "friends",
>"direction" => "out"},
>   {"type"=> "likes",
>"direction" => "out"}],
>"return filter" => {
>"language" => "javascript",
>"body" => "position.length() ==
> 2 && position.lastRelationship() == 'likes';"},
>   "depth" => 2})
>
>
> --
> View this message in context:
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Re: [Neo4j] Network accessible hostname

[Peter Neubauer]

Yes,
this is covered in https://github.com/neo4j/community/issues/46 right?

Cheers,

/peter neubauer

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On Fri, Nov 25, 2011 at 6:43 PM, cmonkus wrote:

> That absolutely would help in our case.
>
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[Neo4j] [Announcement] Neo4j 1.6.M01 "Jörn Kniv"

[Peter Neubauer]

Hi all,
glad to say that we are back to 2 weeks milestone cycles.

Enjoy everyone and have a great Thanksgiving, US peeps!

http://blog.neo4j.org/2011/11/neo4j-16m01-jorn-kniv.html

Cheers,

/peter neubauer

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Re: [Neo4j] Network accessible hostname

[Peter Neubauer]

Clay,
I think that is something we need to check next week, and probably make an
issue to run the Webadmin etc with relative URLs as absolute URLs can be a
pain. Would that help for your case?

Cheers,

/peter neubauer

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On Thu, Nov 24, 2011 at 9:54 PM, Clay Monkus
wrote:

> I am a newbie with Neo4j, so any help is appreciated.
> I have tried many different configuration options regarding the server's
> complete URL for neo4j, but the application does not seem to honor those
> configuration changes.  This can be seen by going to:
>
> http://my.site.com/webadmin/#/data/search/0/
>
> which indicates that it is trying to connect to:
>
> http://j2ee.my.site.com:7474/db/data/node/0, which is local.
>
> Per a suggestion on the neo4j fora, I have made the following changes to
> the
> configuration:
>
> ***
> # REST endpoint for the data API
> # Note the / in the end is mandatory
> org.neo4j.server.webadmin.data.uri=http://my.site.com/db/data/
>
> # REST endpoint of the administration API (used by Webadmin)
> org.neo4j.server.webadmin.management.uri=http://my.site.com/db/manage/
> ***
>
> Allegedly, using the full URI should allow the admin panel to communicate
> with the backend.  However, per the logs, the application is not picking up
> these configuration changes after restart:
>
> ***
> ***
> 2011-11-22 08:34:07.549-0600: --- SERVER STARTUP START ---
> 2011-11-22 08:34:07.549-0600: Server configuration:
> 2011-11-22 08:34:07.551-0600: org.neo4j.server.database.location =
> data/graph.db
> 2011-11-22 08:34:07.552-0600: org.neo4j.server.webserver.port = 7474
> 2011-11-22 08:34:07.552-0600: org.neo4j.server.webserver.address =
> 127.0.0.106
> 2011-11-22 08:34:07.552-0600: org.neo4j.server.webadmin.rrdb.location =
> data/rrd
> 2011-11-22 08:34:07.552-0600: org.neo4j.server.db.tuning.properties =
> conf/neo4j.properties
> 2011-11-22 08:34:07.552-0600: org.neo4j.server.webadmin.management.uri =
> /db/manage/
> 2011-11-22 08:34:07.552-0600: org.neo4j.server.webadmin.data.uri =
> /db/data/
> 2011-11-22 08:34:07.575-0600: Mounted discovery module
> (org.neo4j.server.rest.discovery) at: /
> 2011-11-22 08:34:07.613-0600: Loaded server plugin "CypherPlugin"
> (org.neo4j.server.plugin.cypher.CypherPlugin)
> 2011-11-22 08:34:07.614-0600: GraphDatabaseService.execute_query: execute a
> query
> 2011-11-22 08:34:07.615-0600: Loaded server plugin "GremlinPlugin"
> (org.neo4j.server.plugin.gremlin.GremlinPlugin)
> 2011-11-22 08:34:07.615-0600: GraphDatabaseService.execute_script: execute
> a
> Gremlin script with 'g' set to the Neo4jGraph and 'results' containing the
> results. Only results of one object type is supported.
> 2011-11-22 08:34:07.615-0600: Mounted REST API at: /db/data/
> 2011-11-22 08:34:07.616-0600: Mounted management API at: /db/manage/
> 2011-11-22 08:34:07.653-0600: Mounted webadmin at: /webadmin
> 2011-11-22 08:34:09.084-0600: Server started on: http://127.0.0.106:7474/
> 2011-11-22 08:34:09.085-0600: --- SERVER STARTUP END ---
> ***
>
> As you can see in those logs, neither the data URI nor the web management
> URI have updated to the settings that I placed in the configuration file:
>
> ***
> 2011-11-22 08:34:07.552-0600: org.neo4j.server.webadmin.management.uri =
> /db/manage/
> 2011-11-22 08:34:07.552-0600: org.neo4j.server.webadmin.data.uri =
> /db/data/
> ***
>
> They should show the full URL, namely, http://my.site.com/db/manage/ and
> http://my.site.com/db/data/, respectively.
>
> Do you have any suggestions regarding the configuration?
>
> Thanks,
>
>
>
> Clay Monkus
> Director of Technology
> Intelligent Buildings
> c...@intelligentbuildings.com
> 6000 Fairview Road, Tower II, Suite 1200
> Charlotte, NC 28210 U.S.A.
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Re: [Neo4j] Neo4j Spatial build / run problems

[Peter Neubauer]

Daniel,
https://github.com/neo4j/spatial/commit/0636f88bdf05663fa8c260a1850849a96e78a568is
now running through for me and does execute a Cypher Query over REST,
so
could you please try this out, just to be sure?

Cheers,

/peter neubauer

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On Fri, Nov 25, 2011 at 1:42 PM, danielb  wrote:

> Thanks Peter!
>
> --
> View this message in context:
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Re: [Neo4j] Neo4j Spatial build / run problems

[Peter Neubauer]

Daniel, will do and write some integration tests for this, sorry for the
inconvenience!

Cheers,

/peter neubauer

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On Fri, Nov 25, 2011 at 10:43 AM, danielb  wrote:

> Hi Peter,
>
> unfortunately I can't get it to work. The layer named after osmpath could
> not be used in query because of ':' and '/'. I don't know how to escape
> them
> here. However I did not like the layer to be named in this way, so I
> changed
> the OSMImporter to take 'layerName' and 'osmPath'. I now import the OSM
> file
> with the layer named 'geom' and added the indexprovider. A bbox query now
> stops with "GC overhead limit exceeded" :/
> Can you please verify the OSMimport with bbox query over Cypher / HTTP?
>
> Regards, Daniel
>
> --
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Re: [Neo4j] Neo4j Data Capacities

[Peter Neubauer]

Yes.
However, before that you will probably run into other limitations,
like file sizes, IO and RAM. That is why we are a bit careful about
just going to Longs or UUIDs.

Anything you are thinking of in particular?

Cheers,

/peter neubauer

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On Thu, Nov 24, 2011 at 1:55 PM, bm3780  wrote:
> I've read that Neo4j has data capacity limitations
> (http://docs.neo4j.org/chunked/milestone/capabilities-capacity.html).  I
> would like to confirm my understandings that the node, properties, and
> relationships limitations are for each type (e.g. AND condition), not an
> either/or  (e.g. OR condition).
>
> Neo4j can hold:
>   * ~34 billions nodes, AND
>   * ~34 billion relationships, AND
>   * ~68 billion properties
>
> So I could theoretically have a single graph with 34 billion nodes, where
> each node had two properties and a single relationship.
>
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Re: [Neo4j] Neo4j Spatial build / run problems

[Peter Neubauer]

Daniel,
the OSM import is loaded into its own layer corresponding to the
dataset file name as a default I think (there should be a layer node
created fro it, much in the same way as for the 'geom' index. So, if
you load that layer the same way as an index provider as you did with
the 'geom' index, you should be able to do just that.

Cheers,

/peter neubauer

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On Thu, Nov 24, 2011 at 1:52 PM, danielb  wrote:
> Hi Peter,
>
> I now have a graph with the 'geom' index + testnode from the above code and
> imported some OSM data afterwards. I now want to find 2 nodes by bbox query
> - 550349 and 205372 (see http://dl.dropbox.com/u/18693700/graph.png). How
> can I achieve this? If I query for the bbox I should at least find the
> corresponding GEOM nodes and then traverse over the incoming edge?
>
> I can for example do the following:
> cypher> start n=node:node(way_osm_id = '119810554')
> cypher> return n
> cypher>
> ==>
> +--+
> ==> | n
> |
> ==>
> +--+
> ==> |
> Node[550349]{way_osm_id->119810554,oneway->"BOTH",timestamp->1309673329000,highway->"residential",name->"Frauenstraße",version->"2"}
> |
> ==>
> +--+
> ==> 1 rows, 168 ms
>
> In the posts before I could query the geometry with index 'geom'. The index
> manager only has the following entries:
>
> node lucene {"_blueprints:type":"MANUAL", "type":"exact"}
> relation lucene {"_blueprints:type":"MANUAL", "type":"exact"}
> geom spatial {"_blueprints:type":"MANUAL"}
> way lucene {"_blueprints:type":"MANUAL", "type":"exact"}
> changeset lucene {"_blueprints:type":"MANUAL", "type":"exact"}
> user lucene {"_blueprints:type":"MANUAL", "type":"exact"}
>
> I also have uploaded the complete folder of Neo4j spatial + graph.db:
> http://dl.dropbox.com/u/18693700/neo4j_spatial_osm_graphdb.rar
>
> Regards, Daniel
>
>
>
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