Re: [Neo4j] May I know the cache mechanism of Neo4j?
Yuanlong, is http://docs.neo4j.org/chunked/snapshot/configuration-caches.html giving you information or do you need more? 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. On Thu, Sep 15, 2011 at 5:47 AM, iamyuanlong yuanlong1...@gmail.com wrote: Hello everyone, Anybody can tell me more about the cache mechanism of Neo4j? When use this code get both fans of two user. The result will be auto cache? or Not? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-May-I-know-the-cache-mechanism-of-Neo4j-tp3337895p3337895.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 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] neo4j+playframework
Thank you very much. Can't wait to get to work to try it. Will let you know what happens. Regards, Hnocleland's iPhone On Sep 16, 2011, at 0:18, McKinley mckinley1...@gmail.com wrote: You need the Neo4j proper in your Play lib directory. Here is a Maven pom.xml file that will take care of that for you. **BE CAREFUL** mvn clean will delete all the jars in your lib folder. Remove the clean section if you don't want that. https://gist.github.com/a3a5106efdaaade10496 Run 'mvn initialize' from your Play app directory to copy all jar to lib. Run 'mvn clean' to delete them. If you change Neo4j versions you will want to run a clean and then initialize. Cheers, McKinley On Thu, Sep 15, 2011 at 5:10 PM, henry cleland hnoclel...@gmail.com wrote: Hi peter, I am tryn to use jo4neo with playframework firstly, im unable to resolve it as a dependency directly from maven, secondly, with my manually downloaded lib from http://jo4neo.googlecode.com/svn/trunk/repo/thewebsemantic/jo4neo/0.4.1/ and noe4j from maven, when i try to run my application is it the error i get: Internal Server Error (500) for request GET /Rendezvous/index Oops: NoClassDefFoundError An unexpected error occured caused by exception NoClassDefFoundError: org/neo4j/index/IndexService play.exceptions.UnexpectedException: Unexpected Error at play.mvc.ActionInvoker.invoke(ActionInvoker.java:255) at Invocation.HTTP Request(Play!) Caused by: java.lang.NoClassDefFoundError: org/neo4j/index/ IndexService at jo4neo.impl.ObjectGraphImpl.init(ObjectGraphImpl.java:29) at jo4neo.impl.ObjectGraphProvider.create(ObjectGraphProvider.java: 10) at jo4neo.ObjectGraphFactory.get(ObjectGraphFactory.java:36) at controllers.Rendezvous.clinit(Rendezvous.java:28) at sun.misc.Unsafe.ensureClassInitialized(Native Method) at play.utils.Java.parameterNames(Java.java:193) at play.mvc.ActionInvoker.getActionMethodArgs(ActionInvoker.java:607) at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java: 475) at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java: 470) at play.mvc.ActionInvoker.invoke(ActionInvoker.java:158) ... 1 more Caused by: java.lang.ClassNotFoundException: org.neo4j.index.IndexService at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:321) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:266) ... 11 more On Thu, Sep 15, 2011 at 9:15 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Henry, Anything you can share about jo4neo problems with missing files? I have commit access to the repo... /peter Sent from my phone. On Sep 15, 2011 9:52 PM, henry cleland hnoclel...@gmail.com wrote: oh great!!!, I'll be earnestly looking out for the example. I did hit the wall with my jo4noe. There is a required file that is not in the package. and this has been both intellectually stimulating and frustrating. I do appreciate your advice on manually mapping the classes to graph models and i want to try that once again hoping that this time i will be successful. I really am looking forward to the example so i know how to approach my design. On Thu, Sep 15, 2011 at 7:27 PM, McKinley mckinley1...@gmail.com wrote: I would be happy to share a Neo4j Play framework app with you. I'll isolate a small example and post it. jo4neo looks interesting, but it is not too hard to manually map a few classes to a simple graph model and the experience will be beneficial. The graph model is of a different and finer grain than class based OOP and you shouldn't miss the chance for that to stimulate new ideas. Unfortunately I have too many work deadlines right now, but this weekend I will post the Play plugin and a sample app. However, I'm always happy to be distracted with Neo4j and Play questions so feel free to ask as you dive in :) Cheers, McKinley On Thu, Sep 15, 2011 at 9:20 AM, henry cleland hnoclel...@gmail.com wrote: hiya, thanx for your response. wrapping the models into java classes is a bit challenging for me cos i cant get my head around how the persistence layer will handle that. After the post i did a search for a mapper and found jo4neo, and im currently tryn to use that. Having challenges with how tho make the model persist. I would be very grateful again if you could give me a small sample model implementation for neo such that the controller can persist it. My guess is i need my User Object and Interface to wrap the object into a node or vice versa but how to store, lookup and retrieve it is my challenge. I do strongly wish you reconsider and release your model earlier. or at the least i
Re: [Neo4j] Radix tree
Yes, great work Davide! I think we need to start enabling documentation for the graph collections as it is evolving pretty rapidly! 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. On Thu, Sep 15, 2011 at 1:48 PM, Niels Hoogeveen pd_aficion...@hotmail.com wrote: Thanks to the good work of Davide, graph-collections now contains an implementation of Radix-tree. See: http://en.wikipedia.org/wiki/Radix_tree This particular datastructure can be used to store nodes sorted by a String value, very handy when you want to create associative arrays in Neo4j. Niels ___ 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
Re: [Neo4j] Radix tree
Peter, I agree, we need to work on documentation once the dust has settled around the changes Bryce has been working on. Niels From: peter.neuba...@neotechnology.com Date: Fri, 16 Sep 2011 13:59:07 +0200 To: user@lists.neo4j.org Subject: Re: [Neo4j] Radix tree Yes, great work Davide! I think we need to start enabling documentation for the graph collections as it is evolving pretty rapidly! 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. On Thu, Sep 15, 2011 at 1:48 PM, Niels Hoogeveen pd_aficion...@hotmail.com wrote: Thanks to the good work of Davide, graph-collections now contains an implementation of Radix-tree. See: http://en.wikipedia.org/wiki/Radix_tree This particular datastructure can be used to store nodes sorted by a String value, very handy when you want to create associative arrays in Neo4j. Niels ___ 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 mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j graph collections introduction of NodeCollection interface
Also, since you can do node.getGraphDatabase(), I think we don't need to pass in the graphdb instance in new SortedTree( graphDb(), graphDb().createNode(), new IdComparator(), true, RelTypes.INDEXED_RELATIONSHIP.name() ); ? 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. On Fri, Sep 16, 2011 at 7:37 AM, Bryce bryc...@gmail.com wrote: Hi, I had mentioned in a previous thread that I was working on introducing a NodeCollection interface to remove the dependency from IndexedRelationship to SortedTree. I have an initial cut of this up now in my github repo: https://github.com/brycenz/graph-collections It would be great to get community feedback on this as I think that having a well designed and common NodeCollection interface would help for multiple use cases, e.g. sortedTreeNodeCollection.addAll(linkedListNodeCollection) doing exactly what you think it would. IndexedRelationship now takes a node to index relationships from, a relationship type, and a direction, as well as a NodeCollection at creation time. As in the unit tests this then leads to: Node indexedNode = graphDb().createNode(); SortedTree st = new SortedTree( graphDb(), graphDb().createNode(), new IdComparator(), true, RelTypes.INDEXED_RELATIONSHIP.name() ); IndexedRelationship ir = new IndexedRelationship( indexedNode, RelTypes.INDEXED_RELATIONSHIP, Direction.OUTGOING, st ); To create the IndexedRelationship. To later add nodes to the relationship you need to create an instance of IndexedRelationship without the NodeCollection: IndexedRelationship ir = new IndexedRelationship( indexedNode, RelTypes.INDEXED_RELATIONSHIP, Direction.OUTGOING ); What this means from a NodeCollection implementation point of view is that firstly it needs to use the NodeCollection.RelationshipType.VALUE relationship to connect from its internal data structure to the nodes being added to the collection, and it needs to be able to recreate itself from a base node that is passed into a constructor (that only takes the base node). A node collection also needs to store its class name on the base node for later construction purposes, as well as any other data required to recreate the NodeCollection instance (in the case of SortedTree this is the comparator class, the tree name, and whether it is a unique index. Niels, you may want to have a good look over SortedTree, I have made a few changes to it, mainly around introduction of a base node, and changing of the end value relationships. This could be cleaned up better, but I wanted to start with minimal changes. Both IndexedRelationship and IndexedRelationshipExpander have no dependencies on SortedTree now, and should work with any properly implemented NodeCollection. I will be putting together a paged linked list NodeCollection next to try this. Some future thoughts for NodeCollection, addition of as many of the java.util.Collection methods (e.g. addAll, removeAll, retainAll, contains, containsAll) as well as an abstract base NodeCollection to help provide non-optimised support for these methods. Cheers Bryce ___ 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
Re: [Neo4j] Neo4j graph collections introduction of NodeCollection interface
Bryce's point makes perfect sense. The argument graphDb().createNode() gives the constructor an instance of Node, which contains a reference to the database, so there is no real need to additionally supply the database instance. Of course his example would have been less confusing if he'd written: Node indexedNode = graphDb().createNode(); SortedTree st = new SortedTree( graphDb(), indexedNode, new IdComparator(), true, RelTypes.INDEXED_RELATIONSHIP.name() ); From: peter.neuba...@neotechnology.com Date: Fri, 16 Sep 2011 15:22:27 +0200 To: user@lists.neo4j.org Subject: Re: [Neo4j] Neo4j graph collections introduction of NodeCollection interface Also, since you can do node.getGraphDatabase(), I think we don't need to pass in the graphdb instance in new SortedTree( graphDb(), graphDb().createNode(), new IdComparator(), true, RelTypes.INDEXED_RELATIONSHIP.name() ); ? 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. On Fri, Sep 16, 2011 at 7:37 AM, Bryce bryc...@gmail.com wrote: Hi, I had mentioned in a previous thread that I was working on introducing a NodeCollection interface to remove the dependency from IndexedRelationship to SortedTree. I have an initial cut of this up now in my github repo: https://github.com/brycenz/graph-collections It would be great to get community feedback on this as I think that having a well designed and common NodeCollection interface would help for multiple use cases, e.g. sortedTreeNodeCollection.addAll(linkedListNodeCollection) doing exactly what you think it would. IndexedRelationship now takes a node to index relationships from, a relationship type, and a direction, as well as a NodeCollection at creation time. As in the unit tests this then leads to: Node indexedNode = graphDb().createNode(); SortedTree st = new SortedTree( graphDb(), graphDb().createNode(), new IdComparator(), true, RelTypes.INDEXED_RELATIONSHIP.name() ); IndexedRelationship ir = new IndexedRelationship( indexedNode, RelTypes.INDEXED_RELATIONSHIP, Direction.OUTGOING, st ); To create the IndexedRelationship. To later add nodes to the relationship you need to create an instance of IndexedRelationship without the NodeCollection: IndexedRelationship ir = new IndexedRelationship( indexedNode, RelTypes.INDEXED_RELATIONSHIP, Direction.OUTGOING ); What this means from a NodeCollection implementation point of view is that firstly it needs to use the NodeCollection.RelationshipType.VALUE relationship to connect from its internal data structure to the nodes being added to the collection, and it needs to be able to recreate itself from a base node that is passed into a constructor (that only takes the base node). A node collection also needs to store its class name on the base node for later construction purposes, as well as any other data required to recreate the NodeCollection instance (in the case of SortedTree this is the comparator class, the tree name, and whether it is a unique index. Niels, you may want to have a good look over SortedTree, I have made a few changes to it, mainly around introduction of a base node, and changing of the end value relationships. This could be cleaned up better, but I wanted to start with minimal changes. Both IndexedRelationship and IndexedRelationshipExpander have no dependencies on SortedTree now, and should work with any properly implemented NodeCollection. I will be putting together a paged linked list NodeCollection next to try this. Some future thoughts for NodeCollection, addition of as many of the java.util.Collection methods (e.g. addAll, removeAll, retainAll, contains, containsAll) as well as an abstract base NodeCollection to help provide non-optimised support for these methods. Cheers Bryce ___ 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 mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j graph collections introduction of NodeCollection interface
Hi Bryce, I really like what you are trying to achieve here. One question: Instead of having NodeCollection, why not have GraphCollectionT extends PropertyContainer. That way we can have collections of both Relationships and Nodes. Niels Date: Fri, 16 Sep 2011 17:37:29 +1200 From: bryc...@gmail.com To: user@lists.neo4j.org Subject: [Neo4j] Neo4j graph collections introduction of NodeCollection interface Hi, I had mentioned in a previous thread that I was working on introducing a NodeCollection interface to remove the dependency from IndexedRelationship to SortedTree. I have an initial cut of this up now in my github repo: https://github.com/brycenz/graph-collections It would be great to get community feedback on this as I think that having a well designed and common NodeCollection interface would help for multiple use cases, e.g. sortedTreeNodeCollection.addAll(linkedListNodeCollection) doing exactly what you think it would. IndexedRelationship now takes a node to index relationships from, a relationship type, and a direction, as well as a NodeCollection at creation time. As in the unit tests this then leads to: Node indexedNode = graphDb().createNode(); SortedTree st = new SortedTree( graphDb(), graphDb().createNode(), new IdComparator(), true, RelTypes.INDEXED_RELATIONSHIP.name() ); IndexedRelationship ir = new IndexedRelationship( indexedNode, RelTypes.INDEXED_RELATIONSHIP, Direction.OUTGOING, st ); To create the IndexedRelationship. To later add nodes to the relationship you need to create an instance of IndexedRelationship without the NodeCollection: IndexedRelationship ir = new IndexedRelationship( indexedNode, RelTypes.INDEXED_RELATIONSHIP, Direction.OUTGOING ); What this means from a NodeCollection implementation point of view is that firstly it needs to use the NodeCollection.RelationshipType.VALUE relationship to connect from its internal data structure to the nodes being added to the collection, and it needs to be able to recreate itself from a base node that is passed into a constructor (that only takes the base node). A node collection also needs to store its class name on the base node for later construction purposes, as well as any other data required to recreate the NodeCollection instance (in the case of SortedTree this is the comparator class, the tree name, and whether it is a unique index. Niels, you may want to have a good look over SortedTree, I have made a few changes to it, mainly around introduction of a base node, and changing of the end value relationships. This could be cleaned up better, but I wanted to start with minimal changes. Both IndexedRelationship and IndexedRelationshipExpander have no dependencies on SortedTree now, and should work with any properly implemented NodeCollection. I will be putting together a paged linked list NodeCollection next to try this. Some future thoughts for NodeCollection, addition of as many of the java.util.Collection methods (e.g. addAll, removeAll, retainAll, contains, containsAll) as well as an abstract base NodeCollection to help provide non-optimised support for these methods. Cheers Bryce ___ 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
Re: [Neo4j] Multi-master server architecture
Kynao, Neo4j HA is right now a multiple slaves - single write master architecture that will have a write guarantee on 2 nodes if you write to a slave - the slave itself and the master. While this is good and stable for failover and read-heavy production scenarios, in the next version of Neo4j (2.x) we are looking at actually sharding the graph more dynamically than a Dynamo ring, especially runtime, on different machines, so we kind of hop over the stage of having configurable guarantees in a dynamo replication cluster in order to reach the dynamic graph sharding stage faster. HTH? 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. On Wed, Sep 14, 2011 at 11:08 AM, Kynao cloudbe...@gmail.com wrote: Hi, I'm interested by the Multi-master feature like explained here http://www.assembla.com/spaces/orientdb/wiki/Multi-master_server_architecture. i'm also interested to discuss this proposition... What do you think ? What re you remarks ? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Multi-master-server-architecture-tp3335268p3335268.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 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] sdg: @Indexed for relationships?
I'm struggling with the speed of iterating relations. It's where neo4j is said to shine, so I must be doing something wrong. What can I do to speed up the process of looping relationships related to an object? There are too many bottlenecks (warm-up phase), plus my data is too large to fit all into ram. Is @Indexed meant to be used on @RelatedTo and @RelatedToVia collections also? Or do I have to create relationship indexes manually? And then how would sdg use them, or would I have to fall back to basic neo4j api? Any pointer to wiki/manual? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Rebuilding Lucene index
Hi all, Sorry for a noobish question, my knowledge in Java is limited so reading the source is kinda difficult for me (I use neo4j.rb ruby binding v1.2.2 and neo4j 1.4) I ran into index corruption due to non-clean shutdown (through kill -9) and could not start the database anymore. Looking to discussions like http://www.mail-archive.com/user@lists.neo4j.org/msg06100.html, I decided to delete the index folder and it was solved. However I still need to rebuild the index and have no clue on how to do this, have looked on the docs and cannot really find either. Could anybody please help? I also posted my question here http://stackoverflow.com/questions/7440244/how-to-rebuild-neo4j-lucene-index-neo4j-rb,but neo4j activities seem to be low in stackoverflow Thanks all, appreciate your help!, Rama ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Rebuilding Lucene index
Mmh, so what did you do to get the index corrupted? Are you running neo4j.rb? In there, I am not sure that the Lucene index is integrated into the transactional system like in Neo4j java, so maybe Andreas can shed some light? 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. On Fri, Sep 16, 2011 at 7:14 PM, Rama Manusama rama.manus...@gmail.com wrote: Hi all, Sorry for a noobish question, my knowledge in Java is limited so reading the source is kinda difficult for me (I use neo4j.rb ruby binding v1.2.2 and neo4j 1.4) I ran into index corruption due to non-clean shutdown (through kill -9) and could not start the database anymore. Looking to discussions like http://www.mail-archive.com/user@lists.neo4j.org/msg06100.html, I decided to delete the index folder and it was solved. However I still need to rebuild the index and have no clue on how to do this, have looked on the docs and cannot really find either. Could anybody please help? I also posted my question here http://stackoverflow.com/questions/7440244/how-to-rebuild-neo4j-lucene-index-neo4j-rb,but neo4j activities seem to be low in stackoverflow Thanks all, appreciate your help!, Rama ___ 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
Re: [Neo4j] Multi-master server architecture
Thanks Peter for your answer. While my thinking were different from dynamo too and i'm still searching where part of my explanation are too incomplete or fails, good news about orientation taken in release 2.x, it will be very interesting to know how it works. Yes, your answer helps :) Regards On Fri, Sep 16, 2011 at 5:09 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Kynao, Neo4j HA is right now a multiple slaves - single write master architecture that will have a write guarantee on 2 nodes if you write to a slave - the slave itself and the master. While this is good and stable for failover and read-heavy production scenarios, in the next version of Neo4j (2.x) we are looking at actually sharding the graph more dynamically than a Dynamo ring, especially runtime, on different machines, so we kind of hop over the stage of having configurable guarantees in a dynamo replication cluster in order to reach the dynamic graph sharding stage faster. HTH? 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. On Wed, Sep 14, 2011 at 11:08 AM, Kynao cloudbe...@gmail.com wrote: Hi, I'm interested by the Multi-master feature like explained here http://www.assembla.com/spaces/orientdb/wiki/Multi-master_server_architecture . i'm also interested to discuss this proposition... What do you think ? What re you remarks ? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Multi-master-server-architecture-tp3335268p3335268.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 ___ 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
Re: [Neo4j] Rebuilding Lucene index
Thanks Peter, Andreas, Yes I am running neo4j.rb with the newest version, and torquebox 1.1.1 as server I had a non-clean shutdown through ' kill -9 ' due to a Mechanize web request process that took forever (strangely did not follow the timeout config due to some reason). I should not use kill -9 anymore I guess I also enclose messages.log if it would be useful/interesting for you to see Perhaps Andreas could help with how index rebuilding works here? Thanks alot! Cheers, Rama On Fri, Sep 16, 2011 at 7:18 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Mmh, so what did you do to get the index corrupted? Are you running neo4j.rb? In there, I am not sure that the Lucene index is integrated into the transactional system like in Neo4j java, so maybe Andreas can shed some light? 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. On Fri, Sep 16, 2011 at 7:14 PM, Rama Manusama rama.manus...@gmail.com wrote: Hi all, Sorry for a noobish question, my knowledge in Java is limited so reading the source is kinda difficult for me (I use neo4j.rb ruby binding v1.2.2 and neo4j 1.4) I ran into index corruption due to non-clean shutdown (through kill -9) and could not start the database anymore. Looking to discussions like http://www.mail-archive.com/user@lists.neo4j.org/msg06100.html, I decided to delete the index folder and it was solved. However I still need to rebuild the index and have no clue on how to do this, have looked on the docs and cannot really find either. Could anybody please help? I also posted my question here http://stackoverflow.com/questions/7440244/how-to-rebuild-neo4j-lucene-index-neo4j-rb,but neo4j activities seem to be low in stackoverflow Thanks all, appreciate your help!, Rama ___ 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 -- Rama John Gabriel Manusama rama.manus...@gmail.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] sdg: @Indexed for relationships?
Hey Gonfi, can you explain exactly what it is you're trying to achieve ? * datamodel * # of nodes and rels * # of rels per node (per type) * classes, and the specific access/traversal code that poses the problems That will help us to determine the possible causes for slowdowns as well as solutions. You can use @Indexed inside of Relationship-Entities. Then they will be added to relationship-indexes which might speed up supernode iteration. Neo4j shines at traversing relations, not necessarily in handling supernodes (i.e. nodes with 10k rels) at least not with cold caches when they have to be retrieved from disk. We've planned those heavy relationship issues to be worked on. Cheers Michael Am 16.09.2011 um 17:32 schrieb Gonfi den Tschal: I'm struggling with the speed of iterating relations. It's where neo4j is said to shine, so I must be doing something wrong. What can I do to speed up the process of looping relationships related to an object? There are too many bottlenecks (warm-up phase), plus my data is too large to fit all into ram. Is @Indexed meant to be used on @RelatedTo and @RelatedToVia collections also? Or do I have to create relationship indexes manually? And then how would sdg use them, or would I have to fall back to basic neo4j api? Any pointer to wiki/manual? ___ 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
Re: [Neo4j] Neo4j graph collections introduction of NodeCollection interface
Hi Niels, I had wondered about having a collection interface that covered both nodes and relationships. There were a couple of reasons I didn't go with that right now, though well worthwhile discussing it and going with a GraphCollection super interface if it fits properly. Firstly I wanted to get something out there so people could have a look, and having something that matched what IndexedRelationship currently required was easiest first step. Biggest thing specific in there to that functionality is the addNode method returning a relationship. The other issue was more wondering how a relationship collection would work. Say I have a relationship collection, and I have a relationship R1 between node A and B, how am I going to represent that relationship withing some graph based data structure that makes sense. There could be a node X that is part of the relationship collection data structure (e.g. tree) and that node could have an attribute that has the relationship id on it, but that doesn't seem like it would be very performant. There could be a relationship between X and A that also gave the relationship type of R1, so you could find the relationship based on that, but there isn't any guarantee of the relationship type being unique. What it would need to properly model it is the ability to have a relationship between X and R1, i.e. a relationship from a node to a relationship. If instead of being able to add any given relationship to the relationship collection you instead restrict it to being relationships matching a certain criteria from a given node then it is practically the same thing as a relationship expander. Or if you instead have a way through the relationship collection to create relationships from a given node to a set of other arbitrary nodes, with the relationship collection having a fixed relationship type and direction, then that is practically the current IndexedRelationship. I guess a way it could work is similar to IndexedRelationship, basically more general case of that class, where you have a method on the relationship collection createRelationship(startNode, endNode, relationshipType, direction) that was then stored in an internal data structure to create a pseudo relationship between the start and end, and then being able to iterate over this set of relationships. Not sure exactly what the use case of that would be. Maybe of more interest could be the same situation where the relationship type and direction are fixed, then you may have a friend of set of relationships that you create between arbitrary nodes and then iterate over all of those. I can't personally think of a good way of adding a set of arbitrary relationships into a collection stored in a graph data structure. Thoughts? Cheers Bryce P.S. Peter, I had thought to remove the passing in of the graph database and instead just getting it from the node, or only passing in the graph database and creating the node internally. On Sat, Sep 17, 2011 at 2:19 AM, Niels Hoogeveen pd_aficion...@hotmail.comwrote: Hi Bryce, I really like what you are trying to achieve here. One question: Instead of having NodeCollection, why not have GraphCollectionT extends PropertyContainer. That way we can have collections of both Relationships and Nodes. Niels Date: Fri, 16 Sep 2011 17:37:29 +1200 From: bryc...@gmail.com To: user@lists.neo4j.org Subject: [Neo4j] Neo4j graph collections introduction of NodeCollection interface Hi, I had mentioned in a previous thread that I was working on introducing a NodeCollection interface to remove the dependency from IndexedRelationship to SortedTree. I have an initial cut of this up now in my github repo: https://github.com/brycenz/graph-collections It would be great to get community feedback on this as I think that having a well designed and common NodeCollection interface would help for multiple use cases, e.g. sortedTreeNodeCollection.addAll(linkedListNodeCollection) doing exactly what you think it would. IndexedRelationship now takes a node to index relationships from, a relationship type, and a direction, as well as a NodeCollection at creation time. As in the unit tests this then leads to: Node indexedNode = graphDb().createNode(); SortedTree st = new SortedTree( graphDb(), graphDb().createNode(), new IdComparator(), true, RelTypes.INDEXED_RELATIONSHIP.name() ); IndexedRelationship ir = new IndexedRelationship( indexedNode, RelTypes.INDEXED_RELATIONSHIP, Direction.OUTGOING, st ); To create the IndexedRelationship. To later add nodes to the relationship you need to create an instance of IndexedRelationship without the NodeCollection: IndexedRelationship ir = new IndexedRelationship( indexedNode, RelTypes.INDEXED_RELATIONSHIP, Direction.OUTGOING ); What this means from a NodeCollection implementation point of view is that firstly it needs to use the NodeCollection.RelationshipType.VALUE
