I've included some first thoughts on how you could model this. The
choice of properties/index vs. relationships is often quite obvious,
but is some cases you'll have to try and see which fits best. But
neo4j encourages you to create relationships if you're in doubt and
it's often better to use more
.
>
>
> Thanks in advance!
>
>
>
> [1] http://blog.neo4j.org/2010/02/top-10-ways-to-get-to-know-neo4j.html
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CPU cycles to spare and would like
to participate and make Neo4j better consider running this test and
hopefully improve it somehow... or even create more/other tests which
could trigger problems regarding the robustness of Neo4j.
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on in javadoc for VerboseQuadStrategy about that and they use
the index key "uri" to index and lookup resource nodes.
>> Thank you,
>> Luda
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it is in
> the WebApp's context listener.
>
>
>
> Any thoughts?
>
>
>
> Thanks,
>
>
>
> Rick
>
>
>
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tween comparing using equals
> and toString().
>
> Best regards,
> Thomas
>
> On Fri, Feb 12, 2010 at 11:43 AM, Mattias Persson
> wrote:
>> Yep the answer is simple, it does a .toString() on the object and
>> stores that string (since Lucene handles only strin
better that the
> IndexService uses the common shared interface PropertyContainer instead
> of Node? What is the reason for this design decision?
There has been a lot of requests for that and it's consider for
inclusion in a future version.
>
> Regards,
> Stefan
>
> Ma
> Any thoughts on this?
>
> Best Regards,
> Thomas
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ore using
> indexservice.getNodes(), so I assume node.delete() also removes the
> index entries. Can someone please confirm this?
>
> Regards & thx in advance,
> Stefan
>
>
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for the node
> Roolback the transaction
>
> Will the index be rolled back as well? Or do I have to manually remove
> the index entry?
>
> Best regards,
> Thomas
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ossible so that potential code bugs aren't hidden, but instead
surfaces as early as possible.
2010/2/10 Mattias Persson :
> I don't think that's a very good idea to have as a default behaviour
> since potentially the entire graph is interconnected (and that it
> isn't jus
t; the relationships and remove them.
> Not a big deal because we wrap many other operations but something
> that would nice to have out of the box.
>
> 2010/2/9 Mattias Persson :
>> Yep, that's right... The documentation is a bit unclear/untrue about
>> that. Ryan is ri
ips.
>>
>> Did I miss something or should we consider this a bug?
>>
>> Regards,
>> Stefan
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find that one relationship each time you
request it and that node isn't present in the cache at the moment
(since relationships aren't sorted on disk by type). That should
probably be your only concern.
>
> Dmitri
>
>
> Mattias Persson wrote:
>> 2010/2/8 Rick Bullotta
find that one relationship each time you
request it and that node isn't present in the cache at the moment
(since relationships aren't sorted on disk by type). That should
probably be your only concern.
>
> Dmitri
>
>
> Mattias Persson wrote:
>> 2010/2/8 Rick Bullotta
to define a property in every node, say "nodetype", with
> the appropriate value for every node.
>
> First way seems to be more correct for me, but Im concerning that there
> will be a millions of relations to a single node - is this OK for the
> database performance and deficiency (mill
420)
>
>
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ation errors scare you. :)
>
> Regards,
> Todd
>
Excellent, that's the spirit!
>
>
> On Sat, Feb 6, 2010 at 5:14 PM, Mattias Persson
> wrote:
>> which version are you using? If you're using maven then that component
>> have changed name to (artifactId) neo4j-g
to port to RC1 if we are trying to use graph-algos
> or stay on the old stuff?
>
> Thanks
> Todd
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t
>> org.neo4j.api.core.EmbeddedNeoImpl.(EmbeddedNeoImpl.java:68)
>> > at org.neo4j.api.core.EmbeddedNeo.(EmbeddedNeo.java:49)
>> >
>> > A workaround is to manually remove the transactions logs
>> >
>> > active_tx_log
>> > tm_tx_lo
r
> Twitter http://twitter.com/peterneubauer
>
> http://www.neo4j.org - Relationships count.
> http://gremlin.tinkerpop.com - PageRank in 2 lines of code.
> http://www.linkedprocess.org - Computing at LinkedData scale.
>
>
>
> On Sun, Jan 3, 20
Compass looks quite nice with its simplified lucene API and support
for transactions, so it could might as well be a very good fit to have
as an IndexService implementation. Your implementation hasn't got
transaction support or am I wrong about that?
2010/1/31 Mattias Persson :
> Yep
t;> Neo mailing list
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e node-type query and processing.
>
> --
>
> Francis
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__
it takes to commit the transaction in those 57ms? Would it be ok
if you could post a piece of your code which handles this?
>
> Many thanks in advance,
>
> Best regards,
>
> Maria Giatsoglou
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And also (regarding the UriBasedExecutor class) the "rdf" component is
still called "rdf", but the maven artifact id is called "neo4j-rdf".
Do you depend on the latest (and greatest) "neo4j-graph-matching" and
"neo4j-rdf" components?
2010/2/3
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it out.
>>
>> http://www.vizatweet.com/
>>
>> Matt
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y to set my own id'es for Relations?
>> Only Nodes has such functionality - am I right?
>>
>> -- Forwarded message --
>> From: Anton Popov
>> Date: 2010/1/29
>> Subject: Re: [Neo] Relation properties
>> To: Neo user discussions
>>
_
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ed interface.
>>
>> Hope this is useful
>>
>> Jonny
>>
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> __
way here on the
mailing list if you asked!
>
> -- Forwarded message --
> From: Anton Popov
> Date: 2010/1/29
> Subject: Re: [Neo] Relation properties
> To: Neo user discussions
>
>
> Hello Mattias,
>
> Got it. Thanks.
> Is there any RoadMap
Now it's available at
http://m2.neo4j.org/org/neo4j/neo4j-index/1.0-SNAPSHOT/neo4j-index-1.0-20100129.143758-4.jar
2010/1/29 Mattias Persson :
> 2010/1/29 Symeon (Akis) Papadopoulos :
>>
>>> I just fixed the bug and your benchmarks run fine w/o any modification
>>&g
of annoying in situations like this
:)
>
>
>> You could update to the latest neo4j-kernel as well, but maybe that's
>> not necessary though.
>>
> We'll first try out to update just the neo-index.
> If we face more problems we'll proceed with the kern
hat's
not necessary though.
2010/1/29 Mattias Persson :
> 2010/1/29 Symeon (Akis) Papadopoulos :
>> Mattias Persson wrote:
>>> Another problem I see is that you're having too granular transactions
>>> which will slow down the insertion process quite a bit. Try gro
g node, String key, Object
> value ) applies for Nodes only.
>
> 2010/1/28 Mattias Persson
>
>> Not at all, you're not the first one to overlook that inheritance!
>>
>> 2010/1/28, Anton Popov :
>> > Thanks for a quick answer, Mattias.
>>
2010/1/29 Symeon (Akis) Papadopoulos :
> Mattias Persson wrote:
>> Another problem I see is that you're having too granular transactions
>> which will slow down the insertion process quite a bit. Try grouping a
>> couple of thousands operations in one transaction and y
(Sorry for spamming you guys)
See http://wiki.neo4j.org/content/Transactions for general information
about how to manage transactions in Neo4j.
2010/1/29 Mattias Persson :
> Another problem I see is that you're having too granular transactions
> which will slow down the insertion proc
"too many
open files" issue. And I'm almost 100% sure that it will be resolved
if you increase the span of your transactions.
2010/1/29 Mattias Persson :
> I see that you're not using the Neo4j BatchInserter. Your use case
> could definately benefit from it. Take a loo
ene.LuceneTransaction.doCommit(LuceneTransaction.java:197)
>>>>>>>> at
>>>>>>>> org.neo4j.kernel.impl.transaction.xaframework.XaTransaction.commit(XaTransaction.java:316)
>>>>>>>> at
>>>>>>>
;at
>>>>>>> org.neo4j.kernel.impl.transaction.TransactionImpl.doCommit(TransactionImpl.java:514)
>>>>>>>at
>>>>>>> org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:573)
>>>>>>>at
>>>>>>> org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:543)
>>>>>>>at
>>>>>>> org.neo4j.kernel.impl.transaction.TransactionImpl.commit(TransactionImpl.java:102)
>>>>>>>at
>>>>>>> org.neo4j.kernel.EmbeddedGraphDbImpl$TransactionImpl.finish(EmbeddedGraphDbImpl.java:316)
>>>>>>>... 5 more
>>>>>>> Caused by: java.io.IOException: directory
>>>>>>> '/[some-local-path]/resource_id'
>>>>>>> exists and is a directory, but cannot be listed: list() returned null
>>>>>>>at
>>>>>>> org.apache.lucene.store.FSDirectory.listAll(FSDirectory.java:516)
>>>>>>>at
>>>>>>> org.apache.lucene.store.FSDirectory.listAll(FSDirectory.java:531)
>>>>>>>at
>>>>>>> org.apache.lucene.index.IndexFileDeleter.refresh(IndexFileDeleter.java:307)
>>>>>>>at
>>>>>>> org.apache.lucene.index.IndexWriter.doFlushInternal(IndexWriter.java:4300)
>>>>>>>at
>>>>>>> org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:4192)
>>>>>>>at
>>>>>>> org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:4183)
>>>>>>>at
>>>>>>> org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:2190)
>>>>>>>at
>>>>>>> org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2153)
>>>>>>>at
>>>>>>> org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2117)
>>>>>>>at
>>>>>>> org.neo4j.index.lucene.LuceneDataSource.removeWriter(LuceneDataSource.java:409)
>>>>>>>... 14 more
>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
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>>>>>
>>>>>
>>>>
>>>>
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>>
>>
>>
>>
>
>
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Not at all, you're not the first one to overlook that inheritance!
2010/1/28, Anton Popov :
> Thanks for a quick answer, Mattias.
>
> Sorry for a stupid questions, just haven't noticed the inheritance of
> Relationship interface.
>
> On 28 January 2010 1
Relations?
> The matter is I want to try Dijkstra algorithm performance on some weighted
> directed graph and don't know where to put weight actually...
>
> --
> Best regards,
> Popov Anton
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Thanks,
>> Marko.
>>
>> http://markorodriguez.com
>> http://tinkerpop.com
>>
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>
>
>
> --
her jar file or archive that i need to download? or is my
>> imports wrong?
>>
>> any suggestion would be much appreciated
>>
>> --
>>
>> Francis
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actionImpl.java:102)
>>>>> at
>>>>> org.neo4j.kernel.EmbeddedGraphDbImpl$TransactionImpl.finish(EmbeddedGraphDbImpl.java:316)
>>>>> ... 5 more
>>>>> Caused by: java.io.IOException: directory '/[some-local-path]/resource_id'
>>>>> exists and is a directory, but cannot be listed: list() returned null
>>>>> at
>>>>> org.apache.lucene.store.FSDirectory.listAll(FSDirectory.java:516)
>>>>> at
>>>>> org.apache.lucene.store.FSDirectory.listAll(FSDirectory.java:531)
>>>>> at
>>>>> org.apache.lucene.index.IndexFileDeleter.refresh(IndexFileDeleter.java:307)
>>>>> at
>>>>> org.apache.lucene.index.IndexWriter.doFlushInternal(IndexWriter.java:4300)
>>>>> at
>>>>> org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:4192)
>>>>> at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:4183)
>>>>> at
>>>>> org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:2190)
>>>>> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2153)
>>>>> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2117)
>>>>> at
>>>>> org.neo4j.index.lucene.LuceneDataSource.removeWriter(LuceneDataSource.java:409)
>>>>> ... 14 more
>>>>>
>>>>>
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>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
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>>
>>
>>
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2010/1/26 Symeon (Akis) Papadopoulos :
> Mattias Persson wrote:
>> Ah, do you make sure you call IndexHits#close() on your results from
>> getNodes(), alternatively iterating over the whole result (in which
>> case it's automatically closed)?
>>
> Actually I&
xWriter.java:4192)
> at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:4183)
> at
> org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:2190)
> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2153)
> at org.apache.lucene.in
ost of both traversals may exceed the limit while the
> individual cost is still under limit.
>
> I have attached a patch with the added test that fails.
> Also it would be great to rename the test sub-package from shortestPath to
> shortestpath (same as the source package) because
he code in front of me currently but I just wanted to mention
>> that implementing and using such an approach wasn't too hard at all.
>>
>> best,
>> Jonny
>>
>> On Mon, Jan 25, 2010 at 12:03 AM, Subhash Chandran wrote:
>>
>>> Thanks for lett
ble?
> --
> Regards,
> Subhash Chandran S
>
> http://indiwiz.com/
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ng some data in edges that I need.
>
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ng, but a thing none the less. Agree? Keep up
> the good work :)
>
> -David
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man/listinfo/user
>
> References
>
> 1. https://lists.neo4j.org/mailman/listinfo/user
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o the life span of this bug is quite short.
Hopefully it won't cause too much trouble along the way.
2010/1/22 Mattias Persson :
> A simple fix is to use the IndexHits instance as an Iterable (as
> opposed to an Iterator)... by doing that the problem goes away (it's
> also ok to us
; Nathan Marz
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ory because it could take a little bit to complete
>
>
> On Thu, Jan 21, 2010 at 4:24 PM, Mattias Persson
> wrote:
>> Unfortunately you can't do it in the LuceneIndexService... but I'd
>> guess that it could be exposed in some form, or that it could be
>>
the index with the
> Embedded neo mode?
> In the batch mode we have the optimize() method in the BatchInserter ...
> I have to do manually?
>
> best regards
> Lorenzo
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/neo4j/util/index/SimpleIndexHits.java
>
> So no wonder there is a problem.
>
> Anybody else have this issue?
>
> Is anybody able to use the indexing component successfully?
>
> Thanks for your help.
>
>
>
>
> Cheers,
> Lach
> ________
This can however be done using the "natural index" of the graph, in
that you query for one property and for each hit you traverse the
graph to see if the rest matches. That's more of a "graphy" thinking
in my book.
2010/1/18 Mattias Persson :
> Currently that&#
;>>> Inserts, Updates, Cache etc...
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>>>
>>>
>>>
&
have title=Directory and name=Larry
> Wachowski? The equivalent lucene query would be:
> +title:Director +name:"Larry Wachowski"
>
> I know you can do this in the ruby version of neo, but I am using the java
> version. Would I have to extend the LuceneIndexService and add t
You found your answers in another thread, right?
2010/1/12 Mattias Persson :
> That's strange, let me have a look at it... I'll try such an example
> and see if I can figure out why it isn't working!
>
> 2010/1/12 Zerony Zhao :
>> Thanks for your reply.
>>
FYI, I've implemented such functionality in IndexService (and
LuceneIndexService), i.e added methods:
removeIndex( Node node, String key )
and
removeIndex( String key )
They will be merged into trunk soon after 1.0 release.
2010/1/4 Mattias Persson :
> 2010/1/4 Taylor Cowan :
>>
> System.out.println(node1.getId());
> Iterable knows = node1.getRelationships();
> for (Relationship know : knows)
> {
> Node friend_node = know.getOtherNode(node1);
> System.out.println("\t" + friend_node.getProperty("name"));
> }
> neo.shutdown();
> }
>
> private static enum MyRel
> reading, it will have to be split up into multiple transaction blocks.
>>
>> Ryan
>>
>> On Jan 12, 2010, at 5:28 AM, Mattias Persson wrote:
>>
>>> Your code doesn't need to be littered with transaction management. You
>>> can have a very bi
t; On Jan 12, 2010 8:06 PM, "Mattias Persson"
> wrote:
>
> Lucene supports *something*, but not from the query syntax (how odd is
> that?)... what you can do is to subclass
> LuceneFulltextQueryIndexService and @Override the formQuery method
> with something like:
>
gt; --
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de the transanctional scope. This is the
>> same
>> issue you find with hibernate with LazyInitExceptions when you call
>> to read
>> outside of a session.
>>
>> On Jan 12, 2010 2:28 AM, "Mattias Persson"
>> wrote:
>>
>> Your code doesn't ne
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nd use Spring injection, but what if you don't?
>
> You do it the Oracle(tm) way : buy more ram :)
>
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Although they use the "neo" component, they should be updated to use
the "neo4j-kernel" component... I'll fix soon
2010/1/12 Mattias Persson :
> There's some classes I usually use (fits me, since I wrote them :) ).
> They are in https://svn.neo4j.org/laboratory
n the graph?
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0 TO 1]" ) will returns node with "somekey" value such as 1, 11, 111
> supposing having 1, 11, 111, but I only want returning 1 exactly. I know one
> of solution is using padding scheme to solve the problem. Is there any other
> ways to solve the problem?
>
> On Sun, Jan
where key < value.
>
> Appreciate your help.
>
> Zerony
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hone: +46 706 534857
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the information would be
> guaranteed.
The upside is, as you say, that you get all these nice things such as
consistency for free... as well as that it automatically tags along in
online backup and all such things, which is quite nice.
>
> /Tobias
>
> On Tue, Jan 5, 2010 at 9:34 AM, M
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);
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> Cellphone: +46 706 534857
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dware (raid) you may get a higher insert/update
>> speed. Batch inserter mode does not support concurrent updates.
>
> yes
>
>>
>> Regards,
>> -Johan
>
> Thanks. Any other tips on concurrency are very appreciated.
>
> best regard,
> strozzino
&
neo4j than "drop" I suppose.
>>
>> Thank you,
>> Marko.
>>
>> http://markorodriguez.com
>> http://gremlin.tinkerpop.com
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quot;.
> This is necessary when the data is iterated over using pagination and the
> order determines what the next start node is next.
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rt multiple concurrent users run in production with more than one
>> >> J2EE
>> >> > server even if it is for balancing http load. It is still unclear to
>> me
>> >> how
>> >> > to get data from a neo store if the front end is distributed among
>> >> servers.
>> >>
>> >> Right now we are fully focused on the Neo4j 1.0 release that will be
>> >> out in January. After that focus will shift to HA 1.0 and we aim to
>> >> get a first version out in Q1/Q2. Since we are an embedded database
>> >> the architecture when running multiple machines is a bit different
>> >> then from the typical J2EE setup. Instead of having your separate DB
>> >> cluster machines put the full stack on each machine (http layer+BL+DB
>> >> layer) and run a load balancer in front.
>> >>
>> >> Hope this answers some of your questions.
>> >>
>> >> Regards,
>> >> -Johan
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>> >>
>> >
>> >
>> >
>> > --
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>
>
>
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- PageRank in 2 lines of code.
> http://www.linkedprocess.org - Computing at LinkedData scale.
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Mattias Persson, [matt...@neotechnology.com]
Neo Tec
lled back (not committed).
Transactions which are half-way through the commit process will be
fully committed if possible, else fully rolled back.
>
> Ho and ... Merry christmas :)
Merry Christmas :)
>
> --
> Laurent "ker2x" Laborde
> Sysadmin & DBA at http://www.over-blog.com/
> _
2009/12/24, Sebastian Stober :
> Hi Mattias,
>
> I just ran the test and all looks fine now! :-)
> Thanks for the great support and happy holidays to everybody!
And to you!
Best,
Mattias
>
> Cheers,
> Sebastian
>
>> Date: Wed, 23 Dec 2009 13:15:53 +0100
>> F
Just checking... did the latest index-util fix your problems?
2009/12/21 Mattias Persson :
> I think I fixed it. It'll be available from our maven repo soon!
>
> 2009/12/21 Mattias Persson :
>> Ok great, I'll look into this error and see if I can locate that bug.
>>
Hi again,
any luck with this yet?
2009/12/11 Núria Trench :
> Thank you very much Mattias. I will test it as soon as possible and I'll
> will tell you something.
>
> Núria.
>
> 2009/12/11 Mattias Persson
>
>> I've tried this a couple of times now and first
eneIndexService as per the example. The NeoIndexService is marked not
>>> ready for general usage.
>>>
>>> Any tips for optimizing performance? I don't need transactionality, for
>>> example, because it's a one-t
I think I fixed it. It'll be available from our maven repo soon!
2009/12/21 Mattias Persson :
> Ok great, I'll look into this error and see if I can locate that bug.
>
> 2009/12/21 Sebastian Stober :
>> Hello Mattias,
>>
>> thank you for your quick reply. The
L engine (and parts of Sesame 1?). Would this be better?
>
> Andy
>
> [1] http://www4.wiwiss.fu-berlin.de/bizer/BerlinSPARQLBenchmark/results/V5/
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> htt
quot;name", "Larry Wachowski" );
> index.index( larry, "name", larry.getProperty( "name" ) );
>
> // start the test...
> index.getNodes( "name", "wachowski" )
> now returns only larry instead of both nodes.
>
> Any ideas? I
t;andy AND larry" -->
* o "andy OR larry" --> (1), (2)
* o "larry Wachowski" --> (1), (2) // lucene's default operator is OR
*
* The default AND/OR behaviour can be changed by overriding
* {...@link #getDefaultQueryOperator(String, Objec
Man I liked that quote!
2009/12/17 Rick Bullotta :
> "any sufficiently advanced technology is indistinguishable from magic..." -
> Arthur C. Clarke
>
>
> -Original Message-
> From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On
> B
List.contains(andy));
> // LFTIS: [] LFTQIS: [andy, larry]
>
>
> My conclusions from this:
> 1. LFTIS works only for single-word queries
> How can I then query for "Andy Wachowski"?
>
> 2. LFTQIS is case sensitive: getNodes() retri
ableEvaluator.ALL_BUT_
> START_NODE,
> RelTypes.CATEGORIZED_AS,
> Direction.INCOMING );
>
> Many thanks for any comments and ideas!
>
> Darren
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e
IndexService as a whole in a near future. But currently that can't be
done via the IndexService interface.
>
> Any ideas would be welcome.
>
> Cheers,
> Sebastian
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s() both for
> - size()
> and
> - for actually finding the nodes associated with just the first n
> LuceneIndex matches?
> (as opposed to returning all the nodes in very large objects)
>
> Kind regar
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