[Neo4j] Relationship[3] exist but relationship type[2] not found.
Hi All, I have get the following exception: Exception in thread AWT-EventQueue-0 org.neo4j.graphdb.NotFoundException: Relationship[1451488] exist but relationship type[2] not found. at org.neo4j.kernel.impl.core.NodeManager.getRelForProxy(NodeManager.java:566) at org.neo4j.kernel.impl.core.RelationshipProxy.getType(RelationshipProxy.java:75) From this post (http://neo4j-community-discussions.438527.n3.nabble.com/Neo-NotFoundException-Question-td717235.html) I have learned that it can indicate that my neo4j instance is in the inconsistency state. Is it possible to fix this issue, is it possible to add somehow the missing relationship type? Best Regards, Wojtek ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j Spatial - GeoProcessing in the making
Hi all,
while trying to come up with a good approach to GeoProcessing in Neo4j
Spatial as we wrap up Andreas Wilhelms work from the GSoC, we are
experimenting with a dataflow-based lazy approach (using the generic parts
of Tinkerpop pipes). This is broken up into filtering operations (that
filter out and search geometries) and processing operations (that
manipulate, change and create new geometries).
The first result after a day labbing looks like
https://github.com/neo4j/spatial/blob/master/src/test/java/org/neo4j/gis/spatial/pipes/GeoPipesTest.java,
so basically we have something like
@Test
public void count_all_geometries_in_a_layer()
{
assertEquals( 2, layer.filter().all().count() );
}
@Test
public void count_number_of_points_in_all_geometries_in_a_layer()
{
assertEquals( 24, layer.filter().all().process().countPoints() );
}
What do you think of this approach to provide a simple way to achieve more
complex operations? With the spatial index soon implementing lazy BBox
searches, we should be able to make this work in the filtering part. Maybe
there should be one more part, search() or index(), dropping back to the
starting points that already exist and that not really are taking any input
beside the search parameters?
In the geoprocessing part, we are currently looking into overriding pipe
implementations so that a simple default toPoints() will convert geometries
to Points using JTS, while a more specialized domain-level toPoints() (will
do that in the OSM model) can actually walk the graph to find out the points
that make up a geometry.
WDYT?
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 - Your high performance graph database.
http://startupbootcamp.org/- Öresund - Innovation happens HERE.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
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[Neo4j] Community - count me in!
Hi all, Over the last year, the graph community has seen a fantastic surge of interest and activity. We feel that we can and must support all of you more seriously, so I am stepping up as the first of the Neo Technology community team, dedicating more of my time to explicit community support. http://blog.neo4j.org/2011/09/neo4j-community-team-announcement.html Good days to come everyone, it's an honor to work with you! 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 - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Community - count me in!
Congratulations, Peter! There couldn't be a better champion for Neo4J and the community. -Original Message- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of Peter Neubauer Sent: Tuesday, September 06, 2011 10:33 AM To: Neo4j user discussions; gremlin-users; neo4jrb Subject: [Neo4j] Community - count me in! Hi all, Over the last year, the graph community has seen a fantastic surge of interest and activity. We feel that we can and must support all of you more seriously, so I am stepping up as the first of the Neo Technology community team, dedicating more of my time to explicit community support. http://blog.neo4j.org/2011/09/neo4j-community-team-announcement.html Good days to come everyone, it's an honor to work with you! 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 - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j Events this Week 09/06/2011
*** Hi Everyone, Here are the events organized for this week. If you have any questions regarding participation, feel free to email me at alli...@neotechnology.com * * *LONDON Keynote: Ian Robinson presents @Progressive .NET Tutorials* Wednesday, 7 September @ 09:30 - 13:20 GMT This hands-on tutorial will introduce you to building RESTful web services using the new Microsoft Web APIs (http://wcf.codeplex.com). Over the course of several exercises, we'll develop a simple Fighting Fantasy service for machines to play when they're not busy running your business applications. The tutorial's mixture of theory and practice will cover: - Resource design and development - Test-driven server- and client-side development - The Atom Syndication Format - Caching - Hypermedia http://skillsmatter.com/podcast/open-source-dot-net/restful-web-service-development-in-dot-net *BAY AREA Meetup: Spring Data Neo4j* Wednesday, 7 September @ 19:00 PDT Join us for an introduction to Spring Data, with a special emphasis on Spring Data Neo4j. We'll get you started with this exciting new technology, then take a deeper dive into how you can make the magic happen with Neo4j. www.meetup.com/graphdb/events/30126321/ *WEBINAR: Getting Started with Spring Data Graph* Thursday, 8 September @ 10:00-11:00 PDT The Spring Data project makes it easier to build Spring-powered applications that use new data access technologies such as non-relational NOSQL databases, cloud based data services, and graph databases. This webinar is designed for enterprise developers who are working with Spring and need to understand if they can benefit from a graph database. The session will introduce the different types of data management offered in Spring Data, including graph databases, and will show how easy it is to get started with the Spring Data Graph project. https://www1.gotomeeting.com/register/622766136 *São Paulo Workshop: A Programmatic Introduction to Neo4j *@ QCon 2011 Saturday, 10 September @ 9:00 - 17:00 BRT This tutorial covers the core functionality from the Neo4j graph database, providing a mixture of theory and accompanying practical sessions to demonstrate the capabilities of graph data and the Neo4j database. http://qconsp.com/workshop *São Paulo Presentation: by Adriano Almeida @ QCon 2011 * Saturday, 10 September @ 13:00 BRT http://www.qconsp.com/palestrante/adriano-almeida *Allison Sparrow* * **Marketing Manager | Neo Technology* +19499036091 | @ayeeson http://twitter.com/#%21/ayeeson *** ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] [Spring Data Graph] Some questions/suggestions about cross-store persistence
Hi Michel, sorry just returned from vacation. the problem with 1) is still - you have to start to define fetch-groups for subgraphs etc and you also have to define cascading rules for updates of relationships. Right now I don't have the resources to add all these things (especially as the devil lies in the details). As I already said it is preferable anyway to use attached entities within transactional contexts. The detached state was mainly added as convenience for web-ui handling. I see the one issue that you pointed out regarding updates to detached entities by other users of the graphdb which then show up due to read-through. Regarding your notion of domain objects - that always depends on your architecture. I'll incorporate your suggestions in our planning but can't promise anything about schedules. 2) why is persist confusing? 3) you mean when you persist() a entity to the JPA store then the graph store should be persisted as well? It the entity was retrieved in a tx, all its changes should be written to the graph store anyway without an explicit persist. 4) We'll put some effort in the cross-store part of Spring Data Graph, but that will be probably rather to the end of the year. Cheers Michael Am 06.09.2011 um 23:11 schrieb Michel Domenjoud: Hello! Is there anybody to answer to my previous email? Thanks! Michel 2011/9/2 Michel Domenjoud mdomenj...@octo.com Hi, I'm currently testing Spring Data Graph, with a focus on polyglot persistence use cases, in order to give a short presentation at Spring User Group in Paris on September. This email follows my previous discussion with Michael Hunger (pasted below), and I have some questions/suggestions: 1- Add a real detached state for entities: In my previous discussion, I was a bit worrying about the behaviour of Node Entities which make all getters calls doing a read through in the graph database, even if we are not in a transaction. If I understood it correctly, there is indeed no real detached state for node entities. I think this is really an issue because it doesn't correspond to the domain centric purpose of Spring Data. IMHO, this is a semantic problem: if my NodeEntities are domain objects, I expect that a getter call is immutable, and so that it is not a read from database operation (at least once I'm out of a transaction). = Imagine I have a big process, for example a computation engine using nodes entities retrieved from the graph, with long computation, and output to a file, or another storage engine: -With the current behaviour, the only way to be sure that all properties of a Node Entity are immutable when doing some processes is either to keep a transaction opened during the whole process, either using clones for all nodes. - Keeping a very long transaction, knowing I may use many nodes is IMHO definitly a bad idea. - I can clone my entities, but I think this is not a good idea too, as I will use exactly the same class without any backing Node. = This matter can be really more confusing when using cross-store persistence, as JPA entities have real detached state. To answer to Michael, I don't think this must always goes with complicated Fetch strategies : you could implement a Lazy loading, which would only retrieve node properties by default, then the developper would need to retrieve relationships and related Nodes using an explicit call. 2. persist() operation is a bit confusing and could lead to mistakes: I'd suggest to separate it in two methods, save and merge. 3. Cross-store persistence: Allow explicit re-attaching JPA side operation. Currently, when retrieving a partial NodeEntity from graph database, its JPA is automatically retrieved. On the other side, when retrieving an entity from relationnal database, I have to make an explicit call to persist() to merge the graph side. = I think this can lead to errors, and performances leaks, by example: I use a Traversal to retrieve some partial entities in order to update them, but only for graph side properties. This will work, but for each retrieved entity a implicit JPA merge call will be done... 4- Last question: what are the forecasts about Cross-store persistence API in Spring Data Graph? Are you planning to make some enhancements on it, or is it just some sugar over Spring Data Graph API? Thanks by advance for your answers! Michel Hi Michael, Ok, I get your point now. In fact, the thing I didn't understand yet was that each get call on an entity can be compared as a SELECT on relational db, even no explicit call to the graph repository is done. So, if I understand well, I'd improve the documentation by adding somthing like that after the paragraph Existing All entities returned by library functions are initially in an attached state. Just as with any other entity, changing them outside of a transaction detaches them, and they must be reattached with persist() for the
[Neo4j] Index entry removal after relationship deletion
Hey guys, When a relationship gets deleted, will it be removed from the index automatically? My test shows yes, but I want to be absolutely certain. For example, a relationship :foo exists between node A and B and it's indexed on the foo_rels index with key node_a's id and value node_b's id. When I delete this relationship, do I also have to manually remove it from the index (i.e. a DELETE to /index/relationship/foo_rels/15/23/100 where 15 is the key, 23 is the value, 100 is the relationship id)? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] how Neo4j work for sorting chinese character?
A ha ! I changed the cypher Scala source code by myself . Thank you for your help. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-how-Neo4j-work-for-sorting-chinese-character-tp3309754p3315369.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Index entry removal after relationship deletion
as far as i know, no. you need to do it yourself. hint: http://docs.neo4j.org/chunked/1.4.1/indexing-update.html On Wed, Sep 7, 2011 at 1:25 AM, Nuo Yan yan@gmail.com wrote: Hey guys, When a relationship gets deleted, will it be removed from the index automatically? My test shows yes, but I want to be absolutely certain. For example, a relationship :foo exists between node A and B and it's indexed on the foo_rels index with key node_a's id and value node_b's id. When I delete this relationship, do I also have to manually remove it from the index (i.e. a DELETE to /index/relationship/foo_rels/15/23/100 where 15 is the key, 23 is the value, 100 is the relationship id)? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Best regards Linan Wang ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] multiple lucene index in a transaction doesn't work?!
I've searched around the forum, and aware of people who are using different
indexes for optimization. I am trying modify the
EmbeddedNeo4jWithIndexing.java from the samples directory so support
multiple indexes and I kept on getting exception whenever I try to commit
the transaction. My use case seems so obvious so there must be a solution
for this. If I only have one of the indexes, then it's fine, but whenever I
have 2 indexes then it barf'ed!
The scenario I have is one node with a name and a description. I want the
description to have full text search, but not the name. So here is the
standard setup code (simplified for illustration).
g = new EmbeddedGraphDatabase(storeDir);
nIndex = g.index().forNodes (node_name);
dIndex = g.index().forNodes (node_desc,
MapUtil.stringMap(IndexManager.PROVIDER, lucene, type, fulltext));
try{
tx = graphDatabaseService.beginTx();
node = g.createNode();
node.setProperty(name,hello);
node.setProperty(description,this is the description);
nIndex.add(node, name,hello);
dIndex.add(node, description,this is the description);
tx.success();
}finally{
tx.finish();
}
Here is the exception I got:
Sep 6, 2011 8:53:32 PM org.neo4j.kernel.impl.transaction.TxManager commit
SEVERE: Commit failed
java.nio.channels.OverlappingFileLockException
at
sun.nio.ch.FileChannelImpl$SharedFileLockTable.checkList(FileChannelImpl.java:1166)
at
sun.nio.ch.FileChannelImpl$SharedFileLockTable.add(FileChannelImpl.java:1068)
at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:868)
at java.nio.channels.FileChannel.tryLock(FileChannel.java:962)
at
org.apache.lucene.store.NativeFSLock.obtain(NativeFSLockFactory.java:216)
at org.apache.lucene.store.Lock.obtain(Lock.java:72)
at org.apache.lucene.index.IndexWriter.init(IndexWriter.java:1097)
at
org.neo4j.index.impl.lucene.LuceneDataSource.getIndexWriter(LuceneDataSource.java:588)
at
org.neo4j.index.impl.lucene.CommitContext.ensureWriterInstantiated(CommitContext.java:59)
at
org.neo4j.index.impl.lucene.LuceneCommand$AddCommand.perform(LuceneCommand.java:188)
at
org.neo4j.index.impl.lucene.LuceneTransaction.doCommit(LuceneTransaction.java:259)
at
org.neo4j.kernel.impl.transaction.xaframework.XaTransaction.commit(XaTransaction.java:319)
at
org.neo4j.kernel.impl.transaction.xaframework.XaResourceManager.commit(XaResourceManager.java:456)
at
org.neo4j.kernel.impl.transaction.xaframework.XaResourceHelpImpl.commit(XaResourceHelpImpl.java:64)
at
org.neo4j.kernel.impl.transaction.TransactionImpl.doCommit(TransactionImpl.java:516)
at
org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:659)
at
org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:622)
at
org.neo4j.kernel.impl.transaction.TransactionImpl.commit(TransactionImpl.java:107)
at
org.neo4j.kernel.TopLevelTransaction.finish(TopLevelTransaction.java:85)
EmbeddedNeo4jWithIndexing.main(EmbeddedNeo4jWithIndexing.java:85)
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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Sep 6, 2011 8:53:32 PM org.neo4j.kernel.impl.transaction.TxManager commit
SEVERE: Unable to rollback transaction. Some resources may be commited
others not. Neo4j kernel should be SHUTDOWN for resource maintance and
transaction recovery
javax.transaction.xa.XAException: Unknown
xid[GlobalId[NEOKERNL|-1963523328321029165|2], BranchId[ 52 49 52 49 52 49
]]
at
org.neo4j.kernel.impl.transaction.xaframework.XaResourceManager.rollback(XaResourceManager.java:481)
at
org.neo4j.kernel.impl.transaction.xaframework.XaResourceHelpImpl.rollback(XaResourceHelpImpl.java:111)
at
org.neo4j.kernel.impl.transaction.TransactionImpl.doRollback(TransactionImpl.java:533)
at
org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:685)
at
org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:622)
at
org.neo4j.kernel.impl.transaction.TransactionImpl.commit(TransactionImpl.java:107)
at
org.neo4j.kernel.TopLevelTransaction.finish(TopLevelTransaction.java:85)
EmbeddedNeo4jWithIndexing.main(EmbeddedNeo4jWithIndexing.java:85)
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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Exception in thread main
Re: [Neo4j] Index entry removal after relationship deletion
Thanks. That was what I imagined too. However, I have a test that does: 1. create two nodes (e.g. node 2 and node 3) 2. create a relationship between the two nodes (e.g. rel id 23, type :foo) 3. add the relationship to the foo_rels index, with 2 as the key, 3 as the value (the node ids) on rel id 23. (In REST it's a POST to /index/relationship/foo_rels/2/3 with the URI of the relationship 23 as the body) 4. look up the relationship from the index, returned expected result (GET to /index/relationship/foo_rels/2/3). 5. delete the relationship (id 23) (a DELETE to /relationship/23) 6. look up the relationship from the index again (GET to /index/relationship/foo_rels/2/3), returned empty results ([]). The result of the test confused me. It appears that the relationship was also removed from the index (as step 6 returned empty array) when it was deleted. Any insights? On Sep 6, 2011, at 7:05 PM, Linan Wang wrote: as far as i know, no. you need to do it yourself. hint: http://docs.neo4j.org/chunked/1.4.1/indexing-update.html On Wed, Sep 7, 2011 at 1:25 AM, Nuo Yan yan@gmail.com wrote: Hey guys, When a relationship gets deleted, will it be removed from the index automatically? My test shows yes, but I want to be absolutely certain. For example, a relationship :foo exists between node A and B and it's indexed on the foo_rels index with key node_a's id and value node_b's id. When I delete this relationship, do I also have to manually remove it from the index (i.e. a DELETE to /index/relationship/foo_rels/15/23/100 where 15 is the key, 23 is the value, 100 is the relationship id)? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Best regards Linan Wang ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
