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Need help in remote graph traversal
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Ajay Srivastava <Ajay.Sr...@...>
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
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Robert Dale <rob...@...>
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 On Fri, Oct 13, 2017 at 7:57 AM, Ajay Srivastava <Ajay.Sr...@...> wrote:
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Ajay Srivastava <Ajay.Sr...@...>
Thanks Robert.
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I corrected that and problem got resolved.
Regards,
Ajay
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adrielv...@...
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? On Friday, October 13, 2017 at 7:57:57 AM UTC-4, Ajay Srivastava wrote:
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Ajay Srivastava <Ajay.Sr...@...>
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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