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Re: Error during serialization: Cannot get namespace of root

mandarba...@...
 

I am getting the same error

When I am using python client.

gremlin_client = client.Client('ws://localhost:8182/gremlin', 'g')
gremlin_client.submit("JanusGraphFactory.open('/janusgraph-config/janus-berkleyje.properties')").next()


My gremlin yaml
host: 0.0.0.0
port: 8182
scriptEvaluationTimeout: 30000
channelizer: org.janusgraph.channelizers.JanusGraphWsAndHttpChannelizer
#org.apache.tinkerpop.gremlin.server.channel.WsAndHttpChannelizer
#org.apache.tinkerpop.gremlin.server.channel.HttpChannelizer
graphManager: org.janusgraph.graphdb.management.JanusGraphManager

graphs: {
# graph: /janusgraph-config/janusgraph.properties,
graph: /janusgraph-config/janus-berkleyje.properties,
ConfigurationManagementGraph: /janusgraph-config/JanusGraph-configurationmanagement.properties
}
scriptEngines: {
gremlin-python: {},
gremlin-groovy: {
plugins: { org.janusgraph.graphdb.tinkerpop.plugin.JanusGraphGremlinPlugin: {},
org.apache.tinkerpop.gremlin.server.jsr223.GremlinServerGremlinPlugin: {},
org.apache.tinkerpop.gremlin.tinkergraph.jsr223.TinkerGraphGremlinPlugin: {},
org.apache.tinkerpop.gremlin.jsr223.ImportGremlinPlugin: {classImports: [java.lang.Math], methodImports: [java.lang.Math#*]},
org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin: {files: [scripts/empty-sample.groovy]}}}}
serializers:
- { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { serializeResultToString: true }}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV2d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
# Older serialization versions for backwards compatibility:
- { 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.GraphSONMessageSerializerGremlinV2d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
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


On Tuesday, 11 July 2017 17:16:35 UTC+1, David Pitera wrote:
Hey Ramesh,

I have seen this issue before but only when the query you issue is actually returning a Graph reference itself; and I've only seen it in the context of an Http query. This leads me to believe there is an issue with the way the Http serializer serializes a graph reference.

It should be a no-stopper for you, as everything else should work as expected, and if you really don't like seeing that message, you can modify your gremlin scripts from something like `graph` to `graph; 0;` or `graph.vertices().size()` (anything that doesn't actually return a graph reference).

If you feel so inspired, please open an issue in the repo. I have a feeling but not sure that the fix might be at the TinkerPop level.

On Thursday, July 6, 2017 at 11:04:08 AM UTC-4, Ramesh Nagaraju wrote:
Hi All,

 I am totally new to Graph Databases.
 I am using node js package gremlin-javascript with Janusgraph Project.
 When I execute the node pgm, I get the following error:

 I am not sure what is wrong:


Error during serialization: Cannot get namespace of root (through reference chain: java.util.ArrayList[0]->org.janusgraph.graphdb.database.StandardJanusGraph["backend"]->org.janusgraph.diskstorage.Backend["storeManager"]->org.janusgraph.diskstorage.keycolumnvalue.keyvalue.OrderedKeyValueStoreManagerAdapter["features"]->org.janusgraph.diskstorage.keycolumnvalue.StandardStoreFeatures["keyConsistentTxConfig"]->org.janusgraph.diskstorage.configuration.ModifiableConfiguration["rootNamespace"]->org.janusgraph.diskstorage.configuration.ConfigNamespace["namespace"]) (Error 599)

Thanks
Ramesh N
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