Re: [Neo4j] Slow Traversals on Nodes with too many Relationships

Angelos, I spoke with Johan and he said that traversal iterations than scale not linearly with the numbers of rels indicate a configuration issue or are a bug. Craig reminded me that on Windows the memory mapped buffers are in the heap. Could you please increase your heap to 2 or 3 GB an rerun

Re: [Neo4j] Slow Traversals on Nodes with too many Relationships

I understood that on windows the memory mapped sizes needed to be included in the heap, since they are not allocated outside the heap as they are on linux/mac. So in this case he needs a larger heap (and make sure the memory mapped files are much smaller than the heap). The relevant part of the con

Re: [Neo4j] Most Efficient way to query in my use cases

Absolutely! Funny how entities start falling about the woodwork when you think graphy. There's a "purchase" entity that links the specific pen, shopper, and shop too. You might even boil it down to line items if that makes sense in this domain. And don't get me going on where the pen was (ethic

Re: [Neo4j] Most Efficient way to query in my use cases

Another common thing to do in this case is create a node for the purchase action. This node would be related to the purchaser (user), item (pen) and shop, and would contain data appropriate to the purchase (date/time, price, etc). Then traverse from the shop or the pen to all purchase actions that

Re: [Neo4j] Cannot find a path

Hi Josh, It's a safe assumption that JSON keys will be underscore delimited. If you find something that isn't consider it a bug and let us know. Jim ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user

Re: [Neo4j] Most Efficient way to query in my use cases

Hi Manav, I think there's a relationship missing here. Pen--SOLD_BY-->shop That way it's easy to find all the pens that a shop sold, and who them sold them to. In general modelling your domain expressively does not come at an increase cost with Neo4j (caveat: you can still create write hotspo

Re: [Neo4j] gremlin rest plugin and map

Yes, I am thinking along the lines of the Cypher return tables, see http://docs.neo4j.org/chunked/snapshot/cypher-plugin.html in which there is a column with Node representations, and a column with just a String, etc. Cheers, /peter neubauer GTalk:      neubauer.peter Skype       peter.neubauer

Re: [Neo4j] gremlin rest plugin and map

Tables look great. Just right now googled them. Will they return something JSON encoded like [ row, row ], where row is [ hash, hash ]? -m. On 06/15/2011 11:13 PM, Peter Neubauer wrote: > Great! > > I plan to upgrade to Gremlin 1.1 tomorrow if the source is with me, > and add support even for

Re: [Neo4j] User Digest, Vol 51, Issue 96

Agelos, we are just testing help.neo4j.org, you might try to start a discussion there if that is more convenient? It's web based and should read more like a forum if you like that style. Cheers, /peter neubauer GTalk:      neubauer.peter Skype       peter.neubauer Phone       +46 704 106975 Link

Re: [Neo4j] gremlin rest plugin and map

Great! I plan to upgrade to Gremlin 1.1 tomorrow if the source is with me, and add support even for the table() return construct, so you can do the full shebang there :) Cheers, /peter neubauer GTalk:      neubauer.peter Skype       peter.neubauer Phone       +46 704 106975 LinkedIn   http://ww

Re: [Neo4j] gremlin rest plugin and map

I was doing something wrong on my end. I could see the resulting map but with different values in the web console from the rest plugin. It turns out there was a lingering variable in the web console that I forgot to reset and now I am getting the same values. Thanks Peter. -m. On 06/15/2011 11:

Re: [Neo4j] gremlin rest plugin and map

Well, you get as the result from your expression whatever the last statement is, since from a script, there is only one return construct. You could try putting things into a map or so ( both the count and the list of nodes) and return that? Alternatively, we could send back all bound variables in

Re: [Neo4j] gremlin rest plugin and map

Hey Peter, I think I understand. So that means I can get a sort listed of nodes (the contents of m keys), but not the actual number on which the sorting was based (m values)? -m. On 06/15/2011 10:46 PM, Peter Neubauer wrote: > Marcelo, > the Gremlin plugin is transforming the results from a que

Re: [Neo4j] Cannot execute Cypher

On Tue, Jun 14, 2011 at 9:11 AM, Andres Taylor < andres.tay...@neotechnology.com> wrote: > Hi Pierre, > > On Tue, Jun 14, 2011 at 1:48 PM, Pierre De Wilde >wrote: > > > > >start n=(1) return n > > > > > > > Nothing is returned... > > > Could you look in the logs for any clues? They are in dir>/d

Re: [Neo4j] gremlin rest plugin and map

Marcelo, the Gremlin plugin is transforming the results from a query into Neo4j REST conform structures, while the console is a pure command line interpreter, outputting strings that are not consumable by clients. Does that make sense? Cheers, /peter neubauer GTalk:      neubauer.peter Skype   

Re: [Neo4j] gremlin rest plugin and map

> > n.outE.inV.inE.outV.groupCount(m) >> -1;m.sort{a,b -> b.value <=> a.value} Yep, this versions runs and returns. However the returned values from the web interface are different from the ones via the gremlin plugin. -m. ___ Neo4j mailing list User@

Re: [Neo4j] gremlin rest plugin and map

Oops. n.outE.inV.inE.outV.groupCount(m) >> -1;m.sort{a,b -> b.value <=> a.value} NOT n.outE.inV.inE.outV.groupCount(m);m.sort{a,b -> b.value <=> a.value} >> -1 I didn't see the semicolon. Marko. On Jun 15, 2011, at 1:12 PM, Marko Rodriguez wrote: > Hi, > > The trick to Gremlin is to know th

Re: [Neo4j] gremlin rest plugin and map

Hey Marko, Wow, that was an *unbelievably* fast response. Amazing. > Question: where are you setting the variable 'n' ? Is that Gremlin plugin > thing? > It's unrelated to the neo4j plugin. Just an easy way for me to set up a starting node. -m. ___

Re: [Neo4j] gremlin rest plugin and map

Hi, The trick to Gremlin is to know that an expression is an Iterator and thus, must be iterated. n.outE.inV.inE.outV.groupCount(m);m.sort{a,b -> b.value <=> a.value} Should be: n.outE.inV.inE.outV.groupCount(m);m.sort{a,b -> b.value <=> a.value} >> -1 >> -1 is equivalent to

[Neo4j] gremlin rest plugin and map

Hello neo4j, I'm trying to run via the gremlin server plugin a query like: m=[:];n.outE.inV.inE.outV.groupCount(m);m.sort{a,b -> b.value <=> a.value}; m; This doesn't output anything. I tried m.keySet() and that doesn't return anything either. Any ideas how I could make this work? -m. _

Re: [Neo4j] User Digest, Vol 51, Issue 96

Dear all / Im' sorry if I cant use the user@lists properly, I am indeed lost :-( Neo4J would be so much better as a forum or a stackOverNeo4J :-)***/ Allow me to say, that the 50K magic number is not very useful for real & practical modern Social Network apps. What if there's simply a coup

Re: [Neo4j] No index provider 'lucene' found

I've came back to look at it, and I had deliberatley taken the jar files out of the war folder for a smaller transfer between us. I had also specified that in the email that contained the original archive. I will get back to you and send the project some time tommorrow. Cheers, Ian. Emailed f

Re: [Neo4j] Check if node exists in Neo4J index + possible bug in the "remove" function

Hey all, We've elevated this thread into a tracked discussion at: http://help.neo4j.org/discussions/questions/3-neo4j-check-if-node-exists-in-neo4j-index-possible-bug-in-the-remove-function Feel free to add yourself as a watcher there, and we'll report back here when it's been resolved. This i

Re: [Neo4j] Plugin for REST server not appearing

I agree with Peter on the jar-file. And are there any messages in the data/log/* logfiles or in data/messages.log. Thanks Michael Am 15.06.2011 um 18:27 schrieb Peter Neubauer: > Milena, > the jar file looks right. Do you have the source code for your Plugin > somewhere and can send it over? >

Re: [Neo4j] Archiving in time / being able to quickly refer to a historical state

On Wed, Jun 15, 2011 at 2:31 AM, Patrik Sundberg wrote: > On 14 Jun 2011, at 22:51, Michael Hunger > wrote: > > > Patrick, > > > > David Montag created a versioned graph approach on github: > https://github.com/dmontag/neo4j-versioning > > > > Perhaps you can take some inspiration from that. > >

Re: [Neo4j] Plugin for REST server not appearing

Milena, the jar file looks right. Do you have the source code for your Plugin somewhere and can send it 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/pe

Re: [Neo4j] Slow Traversals on Nodes with too many Relationships

Agelos, sorry, didn't want to sound that way. 512M ram is not very much for larger graphs. Neo4j has to cache nodes, relationships in the heap as well as you own datastructures. The memory mapped files for the datastores are kept outside the heap. Normally with your 4G I'd suggest using about

Re: [Neo4j] Slow Traversals on Nodes with too many Relationships

Hi, when we started to evaluate neo4j we made some measurements and for us it seemed that 50.000 is a magical number: this many relationships and properties on one node seemed to be a limit, which once reached makes things slow. But we didn't actually need that much relationship/property in ou

Re: [Neo4j] Slow Traversals on Nodes with too many Relationships

Re: [Neo4j] Slow Traversals on Nodes with too many Relationships I have to respectfully agree with Rick Bullotta. I was suspecting the big-O is not linear for this case. To verify I added x4 Container nodes (400.000) and their appropriate Relationships, and it is now *unbelievably* slow :

Re: [Neo4j] unique indexes

Or you can use the write locks on nodes to enforce just that. Just grab a write lock prior to reading/writing to it (writing will grab a write lock automatically of course). There's no exposed way of grabbing write locks manually, but removing a non-existent property is a temporary solution. It eve

Re: [Neo4j] Slow Traversals on Nodes with too many Relationships

Could this also be related to the possibility that in order to determine relationship type and direction, the relationships need to be loaded from disk? If so, then having a large number of relationships on the same node would decrease performance, if the number was large enough to affect the disk

Re: [Neo4j] REST API & LuceneTimeline

Depends I would think on how you are putting/posting the data. If via XML or URL parameters, I can't see how Neo would know whether it was a string or a number, but if via JSON you should be able to get it in there properly. Perhaps the REST API should support passing content via either the URL

[Neo4j] Plugin for REST server not appearing

Hi people ! So, I build a plugin just to ease a certain query that's really constant on my system, but it doesn't seams to work. I built it with maven, the .jar that it generates is this: http://www.4shared.com/file/W8_s4LSu/neo4j-customquery-plugin-14M03.html I put it in the plugins folder in the

Re: [Neo4j] REST API & LuceneTimeline

It does- awesome, I didn't realize the query syntax would work for numeric fields, as well. Now I just need to figure out how to insert into a numeric field via rest. -- Matt Luongo Co-Founder, Scholr.ly On Wed, Jun 15, 2011 at 10:24 AM, Rick Bullotta wrote: > Hi, Matt. > > We don't use the RE

Re: [Neo4j] No index provider 'lucene' found

Wow, how did I miss that... Well, thanks for your time. Ian On 2011-06-15, at 04:06, Michael Hunger wrote: > Ian, > > I used your fragments to rebuild your setup, please send a minimal functional > application (it missed the entry-points and also the startup-html files) next > time, that wi

Re: [Neo4j] Cannot execute Cypher

Could you check what the value of this is? scala.util.Properties.versionString Thanks, Andrés On Wed, Jun 15, 2011 at 11:41 AM, Pierre De Wilde wrote: > HiAndrés, > > I also suspect that it's a scala version issue, but unfortunately only > scala-library-2.8.1.jar is present on my machine: >

Re: [Neo4j] REST API & LuceneTimeline

Matt, inserting by other than String in http://docs.neo4j.org/chunked/snapshot/rest-api-indexes.html#rest-api-add-node-to-index is not supported. A shortcoming. This is probably what your plugin should be doing in that case. Will add that as a ticket to be tracked. http://neo4jdb.lighthouseapp.com

Re: [Neo4j] Slow Traversals on Nodes with too many Relationships

I would respectfully disagree that it doesn't necessarily represent production usage, since in some cases, each query/traversal will be unique and isolated to a part of a subgraph, so in some cases, a "cold" query may be the norm -Original Message- From: user-boun...@lists.neo4j.org

Re: [Neo4j] Slow Traversals on Nodes with too many Relationships

That is rather a case of warming up your caches. Determining the traversal speed from the first run is not a good benchmark as it doesn't represent production usage :) The same (warming up) is true for all kinds of benchmarks (except for startup performance benchmarks). Cheers Michael Am 15.

Re: [Neo4j] REST API & LuceneTimeline

Hi, Matt. We don't use the REST API (we use Neo4J in an embedded mode), so I can't be of much help there. If the REST API supports Lucene query syntax, you can use something like: timestamp : [1 to 2] You'd need to do the Date <-> UTC milliseconds conversion on the fro

Re: [Neo4j] REST API & LuceneTimeline

Peter, Kind of. I see how I could do that server-side, but not how to insert elements into the index numerically (with ValueContext(val).indexNumeric()) or query by range ( .query(QueryContext.numericRange() ) via REST. Is this something that will require our writing a plugin to support, or is

Re: [Neo4j] REST API & LuceneTimeline

Yeah, just checked with Mattias. There is no such index configuration, so this does not work. I think you should use the numeric field in a normal index for this, just like Rick points out. Does that make sense? /peter On Wed, Jun 15, 2011 at 3:03 PM, Matt Luongo wrote: > Peter, > > I believe i

Re: [Neo4j] Cannot find a path

Josh, well, a while back we changed the whole REST API not to have whitespace in any keys, so it is safe to assume _ for whitespace, and report as bugs otherwise :) Cheers, /peter neubauer GTalk:      neubauer.peter Skype       peter.neubauer Phone       +46 704 106975 LinkedIn   http://www.link

Re: [Neo4j] neo4j and GUI

Or if you start the server with that database you can browse around in the graph with the built-in webadmin tool. So if you are running in embedded mode you can shut it down, symlink your /data/graph.db/ directory to that db and start it. Then browse to http://localhost:7474/ . If you're running th

Re: [Neo4j] REST API & LuceneTimeline

I guess the other question is how I might accomplish range queries, using REST. -- Matt Luongo Co-Founder, Scholr.ly On Wed, Jun 15, 2011 at 9:05 AM, Matt Luongo wrote: > Rick, > > Is there a sensible way to do that while accessing the index via REST? > I'd prefer if I could create *and* acces

Re: [Neo4j] Possible bug/omission in LuceneTimeline?

Correct, there's nothing special at all with a timeline. It just works its magic with ValueContext/QueryContext for convenience! 2011/6/9 Rick Bullotta > Doh. Forget it. Grokking the code a bit and I see how LuceneTimeline is > just a wrapper around a regular Index. > > Nevermind. ;-) > >

Re: [Neo4j] REST API & LuceneTimeline

Rick, Is there a sensible way to do that while accessing the index via REST? I'd prefer if I could create *and* access the index via the REST interface, but just querying and inserting into the index would be great. -- Matt Luongo Co-Founder, Scholr.ly On Wed, Jun 15, 2011 at 8:55 AM, Rick Bul

Re: [Neo4j] REST API & LuceneTimeline

Peter, I believe it was something like curl -X POST -H Accept:application/json -HContent-Type:application/json -d \ '{"name":"time", "config":{"type":"timeline","provider":"lucene"}}' \ http://localhost:7474/db/data/index/node curl -HContent-Type:application/json -X POST -d \ '"http://loca

Re: [Neo4j] REST API & LuceneTimeline

You really don't need a timeline index to do a timeline index, if that makes sense. As mattias points out, it is just a convenient wrapper around a plain lucene (neo) index. Just index the timestamp as a numeric field. - Reply message - From: "Matt Luongo" Date: Wed, Jun 15, 2011 8:

[Neo4j] Slow Traversals on Nodes with too many Relationships

I have a few "Part" nodes related with each via "HASPART" relationship/edges. (eg Part1---HASPART--->Part2---HASPART--->Part3 etc) . TraversalDescription works fine, following each Part's outgoing HASPART relationship. Then I add a large number (say 100.000) of "Container" Nodes, where each "Conta

Re: [Neo4j] REST API & LuceneTimeline

Peter, I've done a bit more research, and you're right- it isn't. However, the REST api let's me create an index of type 'timeline'. The first time I try to index a node, there's a 500 error (nullpointer) that stems from the index not being created. I'd be happy to file a bug report. Anyway, we'r

Re: [Neo4j] Cannot find a path

Peter, Thanks, that is all very useful for me. For future reference, is it safe to assume that all multi-word data properties (default_cost, cost_property, etc.) will be "_" separated? Or will some be " " separated, like "max depth"? Is there a plan to standardize? -- Josh > Message: 5 > Da

Re: [Neo4j] Use case for Neo4j spatial

Alfredas, I am not too familiar with the natural resources industry, but for the meeting points and approximation of them, you could probably use something like the snapping support that is provided in Neo4j Spatial (right now for snapping points to line segments, see https://github.com/neo4j/neo4j

Re: [Neo4j] How to combine both traversing and index queries?

On Wed, Jun 15, 2011 at 1:51 PM, Peter Neubauer < peter.neuba...@neotechnology.com> wrote: > McKinley, > we are just in the process of adding index hits as starting points to > Cypher, which will then do exactly what you are asking. No ETA yet, > but that is high on the list and will show up in th

Re: [Neo4j] How to combine both traversing and index queries?

McKinley, we are just in the process of adding index hits as starting points to Cypher, which will then do exactly what you are asking. No ETA yet, but that is high on the list and will show up in the docs :) Cheers, /peter neubauer GTalk:      neubauer.peter Skype       peter.neubauer Phone   

Re: [Neo4j] Cannot find a path

Josh, we documented a bit more of the functional test to be included in the docs, see http://docs.neo4j.org/chunked/snapshot/rest-api-graph-algos.html for examples of Dijkstra also. Cheers, /peter neubauer GTalk:      neubauer.peter Skype       peter.neubauer Phone       +46 704 106975 LinkedIn 

Re: [Neo4j] Online Backup to local disk

Rick, there is always a network transfer going on, but of course in the localhost case this is over loopback. Any particular reason you only want file operations to be involved? Cheers, /peter neubauer GTalk:      neubauer.peter Skype       peter.neubauer Phone       +46 704 106975 LinkedIn   ht

Re: [Neo4j] In-graph Timeline index and Neo4j 1.4

Done! - Reply message - From: "Mattias Persson" Date: Wed, Jun 15, 2011 7:14 am Subject: [Neo4j] In-graph Timeline index and Neo4j 1.4 To: "Neo4j user discussions" 2011/6/3 Rick Bullotta > Alternatively, if we could have the "composite index" functionality I > described in a few pre

[Neo4j] Traversing nodes using Indexed relationship's attribute

Hello, I am using neo4j as database in my website. I am having problem in deciding best way to query the database. An user buys, lets say pen, from a shop. User and shop are the nodes and pen is also a node . Relationships are like User1->buysfrom->shop1 User1->uses->pen buysfrom and uses are re

Re: [Neo4j] In-graph Timeline index and Neo4j 1.4

2011/6/3 Rick Bullotta > Alternatively, if we could have the "composite index" functionality I > described in a few previous e-mails (mix timestamp, textual and other > numeric key/values in the same index) - e.g. a Lucene timeline index with > extra keys, that might work well also, would it not?

Re: [Neo4j] BatchInserter exhausting heap...?

Could you perhaps fire up VisualVM and ask it to sample the heap while running? It will tell you exactly what type of objects are allocated the most and how much heap everything takes. Any profiler would suffice, but I really like that one. 2011/6/2 Paul Bandler > Con

Re: [Neo4j] REST API & LuceneTimeline

Matt, what URL are you using to create the timeline? I don't recall that being exposed via REST ... Cheers, /peter neubauer GTalk:      neubauer.peter Skype       peter.neubauer Phone       +46 704 106975 LinkedIn   http://www.linkedin.com/in/neubauer Twitter      http://twitter.com/peterneubaue

[Neo4j] Cannot execute Cypher

HiAndrés, I also suspect that it's a scala version issue, but unfortunately only scala-library-2.8.1.jar is present on my machine: /Applications/neo4j-community-1.4.M04/lib/scala-library-2.8.1.jar Here is the complete log: NFO: Server started on [http://192.168.1.3:7474/] Jun 15, 2011 11:28:19

Re: [Neo4j] Extent of Indexing

Peter, The project requires quick retrieval of data bases upon certain parameters, which, without indexing, would not be feasible (as the relations that hold the data are all same, so simple traversals won't work). As I said earlier, I would have to extract data based upon combination of some param

Re: [Neo4j] Maintaining a subreference for relationships

2011/5/28 Chris Baranowski > Nice, yeah that's what I was thinking too. So then did you bother with > subreferences for node types or just keep your approach consistent by > using indexes for nodes as well? > > Also, iterating over the values of an index is a little more cumbersome > than iterati

[Neo4j] Spring Data Graph 1.1.0.M1 milestone released

Dear Graphistas, After some quiet time that I spend on other important issues, we're back on our regular release cycle/rhythm. We discussed the future SDG roadmap with our CEO Emil and decided to work first on the issues that were reported by our users here on the mailing list, on the spring f

Re: [Neo4j] No index provider 'lucene' found

Ian, I used your fragments to rebuild your setup, please send a minimal functional application (it missed the entry-points and also the startup-html files) next time, that will help a lot in actually looking for the problem instead taking a lot of time setting it up. It turned out that your wa

[Neo4j] Most Efficient way to query in my use cases

Hello, I am using neo4j as database in my website. I am having problem in deciding best way to query the database. An user buys, lets say pen, from a shop. User and shop are the nodes and pen is also a node . Relationships are like User1->buysfrom->shop1 User1->uses->pen buysfrom and uses are re

Re: [Neo4j] How to embed neo4j to OSGI env without spring?

Yes, that's what I managed to do : remaned master to a new branch then checkout upstream/master in local master. Thanks. 2011/6/15 Peter Neubauer > Nicolas, > I think you could just make another branch, or rename the master > branch to something else. Then, you could set up a new master and let