Re: [Neo4j] Neo4j + Rexster lock problem
For such a situation,
you should use the Neoj4 HA cluster, which will manage the propagation of
data between the different instances for you. I think that is the cleanest
and best solution here.
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, May 11, 2011 at 11:34 AM, Marko Rodriguez wrote:
> Hi Sulabh,
>
> You can only have one instance of Neo4j over a particular directory. As
> such, when you want to have multiple threads talking to a single Neo4j, you
> will need to pass that reference around to each thread.
>
> Thus, when Rexster is running over Neo4j, Rexster has that reference. To
> have other threads/software talk to Neo4j via Rexster, you can talk to it
> with:
>
> 1. The RESTful interface:
> https://github.com/tinkerpop/rexster/wiki/Basic-REST-API
> 2. Via Gremlin: https://github.com/tinkerpop/rexster/wiki/Using-Gremlin
> 3. By writing an Extension (Rexster-Kibble):
> https://github.com/tinkerpop/rexster/wiki/Creating-an-Extension
> https://github.com/tinkerpop/rexster-kibbles/wiki
>
> In other words, its illegal to do this:
>
> g1 = new Neo4jGraph('/tmp/graph');
> g2 = new Neo4jGraph('/tmp/graph');
>
> You get the "Unable to lock store" exception. However you can do this:
>
> g = new Neo4jGraph('/tmp/graph');
> createThreadAndProcessGraph(g);
>
> It all comes down to reference to the original instance.
>
> Thanks,
> Marko.
>
> http://markorodriguez.com
>
> On May 11, 2011, at 11:33 AM, sulabh choudhury wrote:
>
> A similar question has been asked previously but I could not find a
> solution which would work for me, hence re-posting it.
>
> I am creating a Neo4j graph and want to expose it over REST using Rexster
> so that I can apply traversals to it.
> Now after I have started Rexster, I see that I cannot write to the graph as
> it throws the "java.lang.IllegalStateException: Unable to lock store
> [complete_graph//neostore], this is usually a result of some other Neo4j
> kernel running using the same store."
>
> So does this mean everytime I have to write to the graph I have to shut
> down Rexster (hence disabling my traversals) and then start it again after I
> finish writing to it?
> I read somewhere that you cannot start multiple services to same store in
> write mode, so is there a way where I can expose it over Rexster just in
> read mode and perform traversals ?
>
> Or is there any way around this problem ?
>
>
>
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j + Rexster lock problem
Hi Sulabh,
You can only have one instance of Neo4j over a particular directory. As such,
when you want to have multiple threads talking to a single Neo4j, you will need
to pass that reference around to each thread.
Thus, when Rexster is running over Neo4j, Rexster has that reference. To have
other threads/software talk to Neo4j via Rexster, you can talk to it with:
1. The RESTful interface:
https://github.com/tinkerpop/rexster/wiki/Basic-REST-API
2. Via Gremlin: https://github.com/tinkerpop/rexster/wiki/Using-Gremlin
3. By writing an Extension (Rexster-Kibble):
https://github.com/tinkerpop/rexster/wiki/Creating-an-Extension
https://github.com/tinkerpop/rexster-kibbles/wiki
In other words, its illegal to do this:
g1 = new Neo4jGraph('/tmp/graph');
g2 = new Neo4jGraph('/tmp/graph');
You get the "Unable to lock store" exception. However you can do this:
g = new Neo4jGraph('/tmp/graph');
createThreadAndProcessGraph(g);
It all comes down to reference to the original instance.
Thanks,
Marko.
http://markorodriguez.com
On May 11, 2011, at 11:33 AM, sulabh choudhury wrote:
> A similar question has been asked previously but I could not find a solution
> which would work for me, hence re-posting it.
>
> I am creating a Neo4j graph and want to expose it over REST using Rexster so
> that I can apply traversals to it.
> Now after I have started Rexster, I see that I cannot write to the graph as
> it throws the "java.lang.IllegalStateException: Unable to lock store
> [complete_graph//neostore], this is usually a result of some other Neo4j
> kernel running using the same store."
>
> So does this mean everytime I have to write to the graph I have to shut down
> Rexster (hence disabling my traversals) and then start it again after I
> finish writing to it?
> I read somewhere that you cannot start multiple services to same store in
> write mode, so is there a way where I can expose it over Rexster just in read
> mode and perform traversals ?
>
> Or is there any way around this problem ?
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j + Rexster lock problem
Sulabh, do you have the setup somewhere? This should not be a problem per se, so I think there is some multiple booting of Neo4j going on ... can try to help you off-list with that and get back with the results here. 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, May 11, 2011 at 9:33 AM, sulabh choudhury wrote: > A similar question has been asked previously but I could not find a > solution which would work for me, hence re-posting it. > > I am creating a Neo4j graph and want to expose it over REST using Rexster > so that I can apply traversals to it. > Now after I have started Rexster, I see that I cannot write to the graph as > it throws the "java.lang.IllegalStateException: Unable to lock store > [complete_graph//neostore], this is usually a result of some other Neo4j > kernel running using the same store." > > So does this mean everytime I have to write to the graph I have to shut > down Rexster (hence disabling my traversals) and then start it again after I > finish writing to it? > I read somewhere that you cannot start multiple services to same store in > write mode, so is there a way where I can expose it over Rexster just in > read mode and perform traversals ? > > Or is there any way around this problem ? > ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j + Rexster lock problem
A similar question has been asked previously but I could not find a solution which would work for me, hence re-posting it. I am creating a Neo4j graph and want to expose it over REST using Rexster so that I can apply traversals to it. Now after I have started Rexster, I see that I cannot write to the graph as it throws the "java.lang.IllegalStateException: Unable to lock store [complete_graph//neostore], this is usually a result of some other Neo4j kernel running using the same store." So does this mean everytime I have to write to the graph I have to shut down Rexster (hence disabling my traversals) and then start it again after I finish writing to it? I read somewhere that you cannot start multiple services to same store in write mode, so is there a way where I can expose it over Rexster just in read mode and perform traversals ? Or is there any way around this problem ? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
