Custom attribute serializer

[J MacNaught]

Hi all,

I'm porting my application from Titan to JanusGraph.

I was able to define a custom serializer for certain Java types, for example, ArrayList.

I cannot get this to work in JanusGraph.

I have this in my configuration: 

root.attributes.custom.attribute1.attribute-class=java.util.HashMap

root.attributes.custom.attribute1.serializer-class=com.ibm.research.psyche.core.serializer.GenericSerializer

root.attributes.custom.attribute2.attribute-class = java.util.LinkedHashMap

root.attributes.custom.attribute2.serializer-class = com.ibm.research.psyche.core.serializer.GenericSerializer

root.attributes.custom.attribute3.attribute-class = java.util.ArrayList

root.attributes.custom.attribute3.serializer-class = com.ibm.research.psyche.core.serializer.GenericSerializer

root.attributes.custom.attribute4.attribute-class = java.util.LinkedList

root.attributes.custom.attribute4.serializer-class = com.ibm.research.psyche.core.serializer.GenericSerializer

I get this error when defining the property:

java.lang.IllegalArgumentException: Not a supported data type: class java.util.ArrayList

at com.google.common.base.Preconditions.checkArgument(Preconditions.java:120) ~[guava-15.0.jar:?]

at org.janusgraph.graphdb.types.StandardPropertyKeyMaker.make(StandardPropertyKeyMaker.java:93) ~[janusgraph-core-0.1.1.jar:?]

.....

Are custom attributes supported anymore?

Note that the Configuration Reference in the documentations says that the option name should be this: 

attributes.custom.[X].attribute-class

But you get this error: java.lang.IllegalStateException: Need to set configuration value: root.attributes.custom.attribute-class

Thanks!

[Jason Plurad]

That functionality works. I've ported my Titan example over to JanusGraph. You shouldn't have "root." on your properties.
Note that JanusGraph registers a standard serializer for HashMap, so an exception would have been thrown if you attempted to register one for it.

[J MacNaught]

Thank you for the example, it helped to know it was supposed to work.  However, I couldn't get your example to work at first. I still got this error:

        java.lang.IllegalStateException: Need to set configuration value: root.attributes.custom.attribute-class

which is really not helpful because if you change the option name to "root.xxx" the error messages go away, but it's not really fixed.

Ultimately, the only way I could get it to work was to delete my cassandra database and start over.   I thought that options which were GLOBAL_OFFLINE could still be configured after DB initialization.

[Robert Dale]

You can change it, just not through the properties file. You have to use the Management interface.   See  http://docs.janusgraph.org/latest/configuration.html#configuration-global

Robert Dale

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[J MacNaught]

Aha!

Perhaps it would be best to configure it programmatically from the beginning.  I already have a java program to define all my schema elements.

Robert Dale

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[Rohit]

I am getting below exception while running gremlin server.

Caused by: java.lang.IllegalArgumentException: Duplicate attribute registration: class java.util.HashMap and class java.util.HashMap

How to resolve this issue?

 Robert Dale wrote:

Robert Dale

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[Jason Plurad]

Do you have a stack trace? That would be helpful, as would more details on how you are registering your custom attribute serialization.

[Rohit]

Hi

We might have define custom attribute serializer for same class.

I have the attribute via Java Client.

mgmt = graph.openManagement();

mgmt.set("attributes.custom.attribute68.attribute-class", "java.util.HashMap");

mgmt.set("attributes.custom.attribute68.serializer-class", "com.vz.attribute.serializer.HashMapSerializer");

 

mgmt.commit();

And I am getting the below line printed as well

*** HashMapSerializer constructor

For the serializer , I have taken inputs from Janusgraph documentation plus your github repo.

however , In the next step I getting below Error

java.lang.IllegalArgumentException: Encountered missing datatype registration for number: 68

at com.google.common.base.Preconditions.checkArgument(Preconditions.java:145) ~[guava-18.0.jar:na]

at org.janusgraph.graphdb.database.serialize.StandardSerializer.getDataType(StandardSerializer.java:192) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.serialize.StandardSerializer.access$600(StandardSerializer.java:56) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.serialize.StandardSerializer$ClassSerializer.getClass(StandardSerializer.java:432) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.serialize.StandardSerializer$ClassSerializer.read(StandardSerializer.java:426) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.serialize.StandardSerializer$ClassSerializer.read(StandardSerializer.java:410) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.serialize.StandardSerializer.readObjectNotNullInternal(StandardSerializer.java:264) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.serialize.StandardSerializer.readClassAndObject(StandardSerializer.java:273) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.EdgeSerializer.readPropertyValue(EdgeSerializer.java:198) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.EdgeSerializer.readPropertyValue(EdgeSerializer.java:193) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.EdgeSerializer.parseRelation(EdgeSerializer.java:136) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.database.EdgeSerializer.readRelation(EdgeSerializer.java:73) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.transaction.RelationConstructor.readRelation(RelationConstructor.java:75) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.transaction.RelationConstructor$1$1.next(RelationConstructor.java:60) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.transaction.RelationConstructor$1$1.next(RelationConstructor.java:48) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.types.vertices.JanusGraphSchemaVertex.getDefinition(JanusGraphSchemaVertex.java:87) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.types.vertices.RelationTypeVertex.multiplicity(RelationTypeVertex.java:65) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.types.vertices.PropertyKeyVertex.cardinality(PropertyKeyVertex.java:36) ~[janusgraph-core-0.2.0.jar:na]

at org.janusgraph.graphdb.tinkerpop.JanusGraphFeatures$JanusGraphVertexFeatures.getCardinality(JanusGraphFeatures.java:160) ~[janusgraph-core-0.2.0.jar:na]

at org.apache.tinkerpop.gremlin.structure.util.Attachable$Method.lambda$createVertex$12(Attachable.java:296) ~[gremlin-core-3.3.1.jar:3.3.1]

at java.util.Iterator.forEachRemaining(Unknown Source) ~[na:1.8.0_73]

at org.apache.tinkerpop.gremlin.structure.util.Attachable$Method.createVertex(Attachable.java:293) ~[gremlin-core-3.3.1.jar:3.3.1]

at org.apache.tinkerpop.gremlin.structure.util.Attachable$Method.lambda$create$10(Attachable.java:149) ~[gremlin-core-3.3.1.jar:3.3.1]

at org.apache.tinkerpop.gremlin.structure.util.Attachable.attach(Attachable.java:63) ~[gremlin-core-3.3.1.jar:3.3.1]

at org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONReader.lambda$readGraph$1(GraphSONReader.java:107) ~[gremlin-core-3.3.1.jar:3.3.1]

at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source) ~[na:1.8.0_73]

at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[na:1.8.0_73]

at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[na:1.8.0_73]

at java.util.ArrayList$Itr.forEachRemaining(Unknown Source) ~[na:1.8.0_73]

at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_73]

at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_73]

at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_73]

at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source) ~[na:1.8.0_73]

at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source) ~[na:1.8.0_73]

at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_73]

at java.util.stream.ReferencePipeline.forEach(Unknown Source) ~[na:1.8.0_73]

at org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONReader.readGraph(GraphSONReader.java:105) ~[gremlin-core-3.3.1.jar:3.3.1]

[rohit....@verizon.com]

 I want this hashmap for data loading via graphson

[as...@appranix.com]

I am getting error: Need to set configuration value: root.attributes.custom.attribute-class while following https://github.com/pluradj/janusgraph-attribute-serializer

Please help me, someone.