Janusgraph: Use gremlinpython with multiple jg graphs

Created on 6 May 2018  路  12Comments  路  Source: JanusGraph/janusgraph

How may one connect to a graph with the gremlinpython package when there are multiple graphs created with ConfiguredGraphFactory.create("<graphname>")?

when trying to connect with graph air_routes,

g = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182', 'air_routes'))

I encountered the error below

gremlin_python.driver.protocol.GremlinServerError: 499: The traversal source [air_routes] for alias [g] is not configured on the server.

it works with a single graph config using the following code

g = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182', 'g'))
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picture zhiboz

Most helpful comment

The default traversal is "injected" in the scope thanks to the empty-sample.groovy script:

globals << [g : graph.traversal()]

The script is loaded when the Gremlin server starts because of this line in the configuration gremlin-server.yaml

scriptEngines: {
  gremlin-groovy: {
    imports: [java.lang.Math],
    staticImports: [java.lang.Math.PI],
    scripts: [scripts/empty-sample.groovy]}}

If you want to connect to multiple graphs from Python, you will need two things:

  • make sure to declare multiple Graph instances in gremlin-server.yaml
graphs: {
  graph1: conf/gremlin-server/graph1.properties,
  graph2: conf/gremlin-server/graph2.properties
}
  • modify empty-sample.groovy to load multiple graph traversals, one for each of your Graph instances
globals << [g1 : graph1.traversal(), g2: graph2.traversal()]

Then in Python 

g1 = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182', 'g1'))
g2 = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182', 'g2'))

I have wrote a complete walk through on how to connect to JanusGraph from Python here

Hope this helps

picture benoitguigal on 20 Jul 2018
❤8 🎉4 👍1

All 12 comments

Hi,
The issue is your gremlin server did not know your traversal.
I think that you did not define your traversal in the groovy file of your gremlin server.

davidclement90 picture davidclement90 on 8 May 2018

The default traversal is "injected" in the scope thanks to the empty-sample.groovy script:

globals << [g : graph.traversal()]

The script is loaded when the Gremlin server starts because of this line in the configuration gremlin-server.yaml

scriptEngines: {
  gremlin-groovy: {
    imports: [java.lang.Math],
    staticImports: [java.lang.Math.PI],
    scripts: [scripts/empty-sample.groovy]}}

If you want to connect to multiple graphs from Python, you will need two things:

  • make sure to declare multiple Graph instances in gremlin-server.yaml
graphs: {
  graph1: conf/gremlin-server/graph1.properties,
  graph2: conf/gremlin-server/graph2.properties
}
  • modify empty-sample.groovy to load multiple graph traversals, one for each of your Graph instances
globals << [g1 : graph1.traversal(), g2: graph2.traversal()]

Then in Python 

g1 = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182', 'g1'))
g2 = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182', 'g2'))

I have wrote a complete walk through on how to connect to JanusGraph from Python here

Hope this helps

benoitguigal picture benoitguigal on 20 Jul 2018
❤8 🎉4 👍1

@benoitguigal would you be interested in contributing some of the knowledge from your blog towards improving the documentation around configuring the Gremlin Server for the Python GLV?

pluradj picture pluradj on 31 Jul 2018

@zhiboz I am facing the same issue. Were you able to find a solution?
@benoitguigal I tried changing as per your comments above but still get the same error.

Below are the changes I made:

Added a new file in /conf 'graph1.properties' :-

gremlin.graph=org.janusgraph.core.ConfiguredGraphFactory
storage.backend=cql
graph.graphname=airroutes
storage.hostname=127.0.0.1
cache.db-cache = true
cache.db-cache-clean-wait = 20
cache.db-cache-time = 180000
cache.db-cache-size = 0.5

Update graphs in gremlin-server.yaml as:-

graphs: {
ConfigurationManagementGraph: conf/janusgraph-cql-configurationgraph.properties,graph1: conf/graph1.properties
}

Updated empty-sample.groovy as:-

globals << [g : graph.traversal(), g1 : graph1.traversal()]

When I query for available graphs from gremlin console I get below results:-

gremlin> ConfiguredGraphFactory.getGraphNames()
==>airroutes

Below is the python code to connect to the server:-

from gremlin_python.structure.graph import Graph
from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection
graph = Graph()
g = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182/gremlin','g1'))
g.V().count().next()

the last command gives below error:-
gremlin_python.driver.driver_remote_connection.GremlinServerError: 499: The traversal source [g1] for alias [g] is not configured on the server.

I am not sure what I am missing here. Can you please help me with this?

akshitbhatnagar2008 picture akshitbhatnagar2008 on 23 Aug 2018

@akshitbhatnagar2008 Did you work this out?

syseeker picture syseeker on 7 Sep 2018

@syseeker not yet...I had to go back to older version of Janusgraph for it to work.

akshitbhatnagar2008 picture akshitbhatnagar2008 on 27 Oct 2018

So, no solution for this yet?

vMarcelino picture vMarcelino on 29 Dec 2018

You can refer to my configuration
https://github.com/JanusGraph/janusgraph/issues/1299#issuecomment-455479457

aofengli picture aofengli on 18 Jan 2019

To prevent confusion we have recently added a default template for new issues containing the guidelines as to what belongs in issues. Usage, configuration, and general questions should be asked in gitter, stackoverflow, or the janusgraph-users google group. Github issues are for reporting bugs, requesting new features, and tracking the development of JanusGraph. If your issue is still outstanding please consult one of the communities mentioned. If you still feel like your issue belongs here and was closed in error please feel free to repoen it.

chupman picture chupman on 7 Feb 2019

@benoitguigal I am not able to use this for ConfiguredGraphFactory

globals << [g1 : graph1.traversal(), g2: ConfigurationManagementGraph.traversal()]

It seems to not work with 'ConfigurationManagementGraph' (https://github.com/JanusGraph/janusgraph/blob/master/docs/configuredgraphfactory.adoc)
I get this error 

java.lang.IllegalStateException: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: static org.janusgraph.graphdb.management.ConfigurationManagementGraph.traversal() is applicable for argument types: () values: []
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.lambda$createGremlinScriptEngine$16(DefaultGremlinScriptEngineManager.java:464)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
    at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
    at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:270)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.createGremlinScriptEngine(DefaultGremlinScriptEngineManager.java:450)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.getEngineByName(DefaultGremlinScriptEngineManager.java:219)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.lambda$getEngineByName$0(CachedGremlinScriptEngineManager.java:57)
    at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:57)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:263)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: static org.janusgraph.graphdb.management.ConfigurationManagementGraph.traversal() is applicable for argument types: () values: []
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:397)
    at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
    at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.lambda$createGremlinScriptEngine$16(DefaultGremlinScriptEngineManager.java:460)
    ... 24 more
Caused by: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: static org.janusgraph.graphdb.management.ConfigurationManagementGraph.traversal() is applicable for argument types: () values: []
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:713)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:395)
    ... 26 more
Caused by: groovy.lang.MissingMethodException: No signature of method: static org.janusgraph.graphdb.management.ConfigurationManagementGraph.traversal() is applicable for argument types: () values: []
    at groovy.lang.MetaClassImpl.invokeStaticMissingMethod(MetaClassImpl.java:1518)
    at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1504)
    at org.codehaus.groovy.runtime.callsite.StaticMetaClassSite.call(StaticMetaClassSite.java:52)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)
    at Script1.run(Script1.groovy:16)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:690)
    ... 27 more
15015 [main] WARN  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Could not initialize gremlin-groovy GremlinScriptEngine as init script could not be evaluated
java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
    at java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:375)
    at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1934)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.lambda$new$4(ServerGremlinExecutor.java:141)
    at java.util.LinkedHashMap$LinkedKeySet.forEach(LinkedHashMap.java:559)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:136)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:120)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:84)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:343)
Caused by: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.registerLookUpInfo(CachedGremlinScriptEngineManager.java:95)
    at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:58)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:263)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
mandar1010 picture mandar1010 on 14 Jun 2019

@benoitguigal I am not able to use this for ConfiguredGraphFactory

globals << [g1 : graph1.traversal(), g2: ConfigurationManagementGraph.traversal()]

It seems to not work with 'ConfigurationManagementGraph' (https://github.com/JanusGraph/janusgraph/blob/master/docs/configuredgraphfactory.adoc)
I get this error

java.lang.IllegalStateException: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: static org.janusgraph.graphdb.management.ConfigurationManagementGraph.traversal() is applicable for argument types: () values: []
  at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.lambda$createGremlinScriptEngine$16(DefaultGremlinScriptEngineManager.java:464)
  at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
  at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
  at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
  at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
  at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:270)
  at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
  at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
  at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
  at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
  at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
  at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
  at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
  at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.createGremlinScriptEngine(DefaultGremlinScriptEngineManager.java:450)
  at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.getEngineByName(DefaultGremlinScriptEngineManager.java:219)
  at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.lambda$getEngineByName$0(CachedGremlinScriptEngineManager.java:57)
  at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
  at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:57)
  at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:263)
  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  at java.lang.Thread.run(Thread.java:748)
Caused by: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: static org.janusgraph.graphdb.management.ConfigurationManagementGraph.traversal() is applicable for argument types: () values: []
  at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:397)
  at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
  at org.apache.tinkerpop.gremlin.jsr223.DefaultGremlinScriptEngineManager.lambda$createGremlinScriptEngine$16(DefaultGremlinScriptEngineManager.java:460)
  ... 24 more
Caused by: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: static org.janusgraph.graphdb.management.ConfigurationManagementGraph.traversal() is applicable for argument types: () values: []
  at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:713)
  at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:395)
  ... 26 more
Caused by: groovy.lang.MissingMethodException: No signature of method: static org.janusgraph.graphdb.management.ConfigurationManagementGraph.traversal() is applicable for argument types: () values: []
  at groovy.lang.MetaClassImpl.invokeStaticMissingMethod(MetaClassImpl.java:1518)
  at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1504)
  at org.codehaus.groovy.runtime.callsite.StaticMetaClassSite.call(StaticMetaClassSite.java:52)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)
  at Script1.run(Script1.groovy:16)
  at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:690)
  ... 27 more
15015 [main] WARN  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Could not initialize gremlin-groovy GremlinScriptEngine as init script could not be evaluated
java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
  at java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:375)
  at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1934)
  at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.lambda$new$4(ServerGremlinExecutor.java:141)
  at java.util.LinkedHashMap$LinkedKeySet.forEach(LinkedHashMap.java:559)
  at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:136)
  at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:120)
  at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:84)
  at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:343)
Caused by: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
  at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.registerLookUpInfo(CachedGremlinScriptEngineManager.java:95)
  at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.getEngineByName(CachedGremlinScriptEngineManager.java:58)
  at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:263)
  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  at java.lang.Thread.run(Thread.java:748)
  1. Do not use file 'empty-sample.groovy'
  2. ConfigurationManagementGraph is dynamically binding xx_traversal

e.g. g = traversal().withRemote(DriverRemoteConnection.using("tinkerpop/remote-objects.yaml", "ig_traversal"))

  1. Where 'ig' is your 'graphname' its using ConfiguredGraphFactory.create("ig") mehod created.

see
https://docs.janusgraph.org/basics/configured-graph-factory/#graph-and-traversal-bindings
https://docs.janusgraph.org/basics/multi-node/#dynamic-graph-and-traversal-bindings

english is not good
I think you will understand.

wjtien picture wjtien on 11 Nov 2019

@wjtien it failed me to auto generate xx_traversal when it comes to docker env, do you use docker for this?

ChenZhaobin picture ChenZhaobin on 16 Sep 2020
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