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

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On Wed, May 11, 2011 at 11:34 AM, Marko Rodriguez <okramma...@gmail.com>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 ?
>
>
>
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