How to traverse graph created using ConfiguredPlanFactory ?

[AG]

Hello All, 

I have set up a Janusgraph Cluster with Cassandra + ES. The cluster has been set up to support ConfiguredGraphFactory. Also, I am connecting the gremlin cluster remotely. I have set up a client and am able to create a graph using :

client.submit(String.format("ConfiguredGraphFactory.create(\"%s\")", graphName));

However, I am not able to get the traversalSource of the graph created using the gremlin driver. Do I have to create raw gremlin queries and traverse the graph using client.submit or is there a way to get it through the gremlin driver using Emptygraph.Instance()

Thanks,

-AG

[David Pitera]

I answered this here https://stackoverflow.com/questions/47342524/how-to-traverse-graph-created-using-configuredplanfactory-in-janusgraph/47354728#47354728 

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[AG]

Hey David,

It seems the stack overflow chatroom is no longer active.  I don't see much activity on the tinkerpop board link (https://issues.apache.org/jira/browse/TINKERPOP-1839) either.

So, thought of taking the conversation ahead through this thread.  I am kind of stuck on this so it would be great if you can suggest a workaround/solution to get around the problem. Let me know if you need further information.

-Anand

On Friday, 17 November 2017 08:07:21 UTC-8, David Pitera wrote:

I answered this here https://stackoverflow.com/questions/47342524/how-to-traverse-graph-created-using-configuredplanfactory-in-janusgraph/47354728#47354728 

On Fri, Nov 17, 2017 at 9:30 AM AG <anan...@gmail.com> wrote:

Hello All, 

I have set up a Janusgraph Cluster with Cassandra + ES. The cluster has been set up to support ConfiguredGraphFactory. Also, I am connecting the gremlin cluster remotely. I have set up a client and am able to create a graph using :

client.submit(String.format("ConfiguredGraphFactory.create(\"%s\")", graphName));

However, I am not able to get the traversalSource of the graph created using the gremlin driver. Do I have to create raw gremlin queries and traverse the graph using client.submit or is there a way to get it through the gremlin driver using Emptygraph.Instance()

Thanks,

-AG

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[David Pitera]

Sorry, I thought the step forward was obvious from the TinkerPop issue. There are two possible solutions to the problem:

1. The short term solution: You make use of the fact that "context" is bound to the ServerGremlinExecutor's context object, and use the setAttribute() function as Stephen explained in the Jira issue to update the global binding of your traversal source name to the traversal source. You would have to issue remote script submission to the server to do this. So if your graph is name "dynamic_g", you can do something like:

client.submit("context.setAttribute(\"dynamic_g_traversal\",ConfiguredGraphFactory.open(\"dynamic_g\").traversal(),javax.script.ScriptContext.GLOBAL_SCOPE);");

2. The long term solution that JanusGraph should adopt. I want to get around to writing this solution, but if you have the cycles, please do and open up a PR against the OSS: Write a custom Channelizer for JanusGraph, and then we can make it so that JanusGraph has access to lower level GremlinServer components. Then you can modify the ConfiguredGraphFactory code to automatically update the context's global bindings when a graph is open.

Good luck!

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[nikhil...@gmail.com]

I tried the same thing from gremlin console

gremlin> context.setAttribute("test_g", ConfiguredGraphFactory.open("abcd").traversal(),javax.script.ScriptContext.GLOBAL_SCOPE)

==>null

gremlin> test_g

No such property: test_g for class: Script23

Type ':help' or ':h' for help.

Display stack trace? [yN]N

This is the error i'm getting. Am i missing something?

[David Pitera]

I fixed this in JG 0.3 (which has not been released yet) so you can build a dist yourself off of master now or wait for JG 0.3 to be released:

https://github.com/JanusGraph/janusgraph/pull/953

https://github.com/JanusGraph/janusgraph/pull/884

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[nikhil...@gmail.com]

ok. is there no other alternative(in JG 0.2) to manually adding bindings and restarting the server every time we want to create a new graph?

[David Pitera]

You can use a different client or try to use the fix described in here https://issues.apache.org/jira/browse/TINKERPOP-1839

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[nikhil...@gmail.com]

Is this the solution you are referring to? If yes, then i have already tried this(as mentioned in above comments). It doesn't work for me. 
Can you please tell me what are some of the other clients you were referring to?

[nikhil...@gmail.com]

Instead of what is mentioned in the link, if we use "context.setAttribute("test_dynamic_ts", ConfiguredGraphFactory.create("test_dynamic").traversal(), 100)", it works.But here the int value 100, represents ENGINE_SCOPE. And if i try 200(for GLOBAL_SCOPE), instead of 100, it fails to create that binding. Can you please help me with this?