Re: [Neo] threading
Yes I remember but that bug was triggered by concurrently executing getSingleRelatoinship and create/delete relationship (and it's fixed now). My guess is that if this is a bug (it may very well be but I need some code that triggers it) the problem will be found in the fairly new iterable implementation. -Johan On Mon, Oct 12, 2009 at 10:01 PM, Mattias Persson matt...@neotechnology.com wrote: Johan I recognize these characteristics from a previous bug (in the normal EmbeddedNeo). Do you remember it as well? So if there's an old ticket we perhaps could find it and get a clue from there? 2009/10/11, Johan Svensson jo...@neotechnology.com: On Sun, Oct 11, 2009 at 6:01 PM, Marc Preddie mpred...@gmail.com wrote: ... ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo] threading
Johan I recognize these characteristics from a previous bug (in the normal EmbeddedNeo). Do you remember it as well? So if there's an old ticket we perhaps could find it and get a clue from there? 2009/10/11, Johan Svensson jo...@neotechnology.com: On Sun, Oct 11, 2009 at 6:01 PM, Marc Preddie mpred...@gmail.com wrote: Hi Johan, That's what I initially suspected, and so I ran a small test to output the relationship in question, and there is only one. But wouldn't the same error occur when using a single thread, if there were more than one relationship of the same type and I invoked getSingleRelationship... If there is no writing going on it shouldn't matter if you are reading with one or many threads, they should all return the same relationships. If it helps at all I'm running on winxp 64bit. I'm going to try to replicate the issue with using a small sample and if I can, would it be helpful to send it you? It would be very helpful if you can send me sample code that reproduce the issue. Regards, -Johan ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Mattias Persson, [matt...@neotechnology.com] Neo Technology, www.neotechnology.com ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo] threading
Marc, Could you check if the node that you invoke getSingleRelationship on actually has one relationship (of BELONGS_TO_CATEGORY, OUTGOING) when you only perform read operations. You could use the shell (see http://wiki.neo4j.org/content/Shell) and go to the node listing all relationships: // go to node 149816 and list relationships neo-sh (0)$ cd -a 149816 neo-sh (0)$ ls -Johan On Sat, Oct 10, 2009 at 4:35 PM, Marc Preddie mpred...@gmail.com wrote: Hi Johan, No, I am strictly reading from the graph. I have single read only instance which I am attempting to use across multiple threads as you suggest. Regards, Marc On Sat, Oct 10, 2009 at 9:23 AM, Johan Svensson jo...@neotechnology.comwrote: Hi, Do you have a NeoService writing to the store concurrently with the embedded read only ones? Regarding the other question you should use one NeoService (instance) per machine/across multiple threads. The read only instance is more suitable when your graph does not change and you need to load balance reads over multiple machines. Regards, -Johan On Thu, Oct 8, 2009 at 11:52 PM, Marc Preddie mpred...@gmail.com wrote: Hi, When using multiple threads if I use normal (non readonly) neo and lucene index everything works perfectly. If I use the readonly versions of neo and luceneIndex; I begin to get errors of the sort --- More than one relationship[BELONGS_TO_CATEGORY, OUTGOING] found for NodeImpl#149816 --- from ... NodeImpl.getSingleRelationship. If I use the readonly versions from a single thread everything works. Has anyone come across this issue? I'm using build 3108. One other question I have is would it better to use a readonly neo/index instance per thread or use a single neo/index across multiple threads? Regards, Marc ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo] threading
On Sun, Oct 11, 2009 at 6:01 PM, Marc Preddie mpred...@gmail.com wrote: Hi Johan, That's what I initially suspected, and so I ran a small test to output the relationship in question, and there is only one. But wouldn't the same error occur when using a single thread, if there were more than one relationship of the same type and I invoked getSingleRelationship... If there is no writing going on it shouldn't matter if you are reading with one or many threads, they should all return the same relationships. If it helps at all I'm running on winxp 64bit. I'm going to try to replicate the issue with using a small sample and if I can, would it be helpful to send it you? It would be very helpful if you can send me sample code that reproduce the issue. Regards, -Johan ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo] threading
Hi Johan, No, I am strictly reading from the graph. I have single read only instance which I am attempting to use across multiple threads as you suggest. Regards, Marc On Sat, Oct 10, 2009 at 9:23 AM, Johan Svensson jo...@neotechnology.comwrote: Hi, Do you have a NeoService writing to the store concurrently with the embedded read only ones? Regarding the other question you should use one NeoService (instance) per machine/across multiple threads. The read only instance is more suitable when your graph does not change and you need to load balance reads over multiple machines. Regards, -Johan On Thu, Oct 8, 2009 at 11:52 PM, Marc Preddie mpred...@gmail.com wrote: Hi, When using multiple threads if I use normal (non readonly) neo and lucene index everything works perfectly. If I use the readonly versions of neo and luceneIndex; I begin to get errors of the sort --- More than one relationship[BELONGS_TO_CATEGORY, OUTGOING] found for NodeImpl#149816 --- from ... NodeImpl.getSingleRelationship. If I use the readonly versions from a single thread everything works. Has anyone come across this issue? I'm using build 3108. One other question I have is would it better to use a readonly neo/index instance per thread or use a single neo/index across multiple threads? Regards, Marc ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
