Need help in remote graph traversal

[Ajay Srivastava]

Hi,

I am trying to add a vertex using remote graph traversal and getting following error -

scala> val graph = EmptyGraph.instance().traversal().withRemote("/root/janusgraph-0.1.1-hadoop2/conf/janusgraph-remote.properties")

graph: org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource = graphtraversalsource[emptygraph[empty], standard]

scala> graph.addV("Concept").property("ABC", 12).head

17:17:39,585  INFO Connection:121 - Created new connection for ws://dev-3:8182/gremlin

17:17:39,592  INFO Connection:121 - Created new connection for ws://dev-3:8182/gremlin

17:17:39,592  INFO ConnectionPool:106 - Opening connection pool on Host{address=ajay-dev-3/192.168.168.171:8182, hostUri=ws://ajay-dev-3:8182/gremlin} with core size of 2

java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.tinkerpop.gremlin.process.remote.traversal.DefaultRemoteTraverser

  at org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal$TraverserIterator.next(DriverRemoteTraversal.java:138)

  at org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal$TraverserIterator.next(DriverRemoteTraversal.java:123)

  at org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal.nextTraverser(DriverRemoteTraversal.java:104)

  at org.apache.tinkerpop.gremlin.process.remote.traversal.step.map.RemoteStep.processNextStart(RemoteStep.java:62)

  at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:128)

  at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:38)

  at org.apache.tinkerpop.gremlin.process.traversal.Traversal.fill(Traversal.java:154)

  at org.apache.tinkerpop.gremlin.process.traversal.Traversal.toList(Traversal.java:111)

  at gremlin.scala.GremlinScala.toList(GremlinScala.scala:30)

  at gremlin.scala.GremlinScala.head(GremlinScala.scala:39)

  ... 32 elided

scala> graph.addV().head

java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.tinkerpop.gremlin.process.remote.traversal.DefaultRemoteTraverser

  at org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal$TraverserIterator.next(DriverRemoteTraversal.java:138)

What could be the reason for above exception ?

Regards,

Ajay

[Robert Dale]

Looks like one side of your serializers is set to `serializeResultToString: true`. 

Your remote client properties file should look like:  https://github.com/JanusGraph/janusgraph/blob/master/janusgraph-dist/src/assembly/static/conf/remote-graph.properties

Your clusterFile should point to something like:  https://github.com/JanusGraph/janusgraph/blob/master/janusgraph-dist/src/assembly/static/conf/remote-objects.yaml

Robert Dale

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[Ajay Srivastava]

Thanks Robert.

I corrected that and problem got resolved.

Regards,

Ajay

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[adrielv...@gmail.com]

I'm in a similiar position as you; however, my properties files seems to be incorrect. Do you mind posting a sample of your janusgraph-remote.properties?

[Ajay Srivastava]

Hi,

These are files from my old setup. Hope that it’s useful for you. I was doing POC of graph dbs and have started working on another project now.

[root@ajay-dev-1 conf]# cat janusgraph-remote.properties

gremlin.remote.remoteConnectionClass=org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteConnection

# cluster file has the remote server configuration

gremlin.remote.driver.clusterFile=/root/janusgraph-0.1.1-hadoop2/conf/remote-objects.yaml

# source name is the global graph traversal source defined on the server

gremlin.remote.driver.sourceName=g

[root@ajay-dev-1 conf]# cat remote-objects.yaml

hosts: [ajay-dev-3]

port: 8182

serializer: { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

[root@ajay-dev-1 conf]# cat remote-objects.yaml

hosts: [ajay-dev-3]

port: 8182

serializer: { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

[root@ajay-dev-1 conf]# cat gremlin-server/socket-gremlin-server.yaml 

host: ajay-dev-3

port: 8182

scriptEvaluationTimeout: 30000

channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer

graphs: {

  graph: conf/gremlin-server/socket-janusgraph-hbase-server.properties

  olapgraph: conf/hadoop-graph/read-hbase.properties }

plugins:

  - janusgraph.imports

scriptEngines: {

  gremlin-groovy: {

    imports: [java.lang.Math],

    staticImports: [java.lang.Math.PI],

    scripts: [scripts/empty-sample.groovy]}}

serializers:

  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoLiteMessageSerializerV1d0, config: {ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { serializeResultToString: true }}

  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV2d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

processors:

  - { className: org.apache.tinkerpop.gremlin.server.op.session.SessionOpProcessor, config: { sessionTimeout: 28800000 }}

  - { className: org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor, config: { cacheExpirationTime: 600000, cacheMaxSize: 1000 }}

metrics: {

  consoleReporter: {enabled: true, interval: 180000},

  csvReporter: {enabled: true, interval: 180000, fileName: /tmp/gremlin-server-metrics.csv},

  jmxReporter: {enabled: true},

  slf4jReporter: {enabled: true, interval: 180000},

  gangliaReporter: {enabled: false, interval: 180000, addressingMode: MULTICAST},

  graphiteReporter: {enabled: false, interval: 180000}}

maxInitialLineLength: 4096

maxHeaderSize: 8192

maxChunkSize: 8192

maxContentLength: 65536

maxAccumulationBufferComponents: 1024

resultIterationBatchSize: 64

writeBufferLowWaterMark: 32768

writeBufferHighWaterMark: 65536

ssl: {

  enabled: false}

Regards,

Ajay

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