tinkerpop gremlin neo4j db Multiple properties on a vertex is not supported

[Pavankumar B]

Hi,
I am using tinkerpop's gremlin server with neo4j db.

How to set the vertex property cardinality to set or list?

java.lang.UnsupportedOperationException: Multiple properties on a vertex is not supported at org.apache.tinkerpop.gremlin.structure.VertexProperty$Exceptions.multiPropertiesNotSupported(VertexProperty.java:99) at org.apache.tinkerpop.gremlin.neo4j.structure.trait.NoMultiNoMetaNeo4jTrait.setVertexProperty(NoMultiNoMetaNeo4jTrait.java:101) at org.apache.tinkerpop.gremlin.neo4j.structure.Neo4jVertex.property(Neo4jVertex.java:85) at org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.AddPropertyStep.sideEffect(AddPropertyStep.java:121) at org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.SideEffectStep.processNextStart(SideEffectStep.java:39) at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143) at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.hasNext(DefaultTraversal.java:192) at org.apache.tinkerpop.gremlin.server.op.AbstractOpProcessor.handleIterator(AbstractOpProcessor.java:89) at org.apache.tinkerpop.gremlin.server.op.AbstractEvalOpProcessor.lambda$evalOpInternal$5(AbstractEvalOpProcessor.java:252) at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:273) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

I have tried setting these following properties in neo4j.properties

gremlin.graph=org.apache.tinkerpop.gremlin.neo4j.structure.Neo4jGraph
gremlin.neo4j.directory=/var/lib/neo4j/data/databases/graph.db
gremlin.neo4j.conf.node_auto_indexing=true
gremlin.neo4j.conf.relationship_auto_indexing=true
gremlin.neo4j.conf.allow_store_upgrade=true
gremlin.neo4j.conf.multiProperties=true
gremlin.neo4j.conf.metaProperties=true
gremlin.tinkergraph.defaultVertexPropertyCardinality=list

and restarted the gremlin-server.

[Stephen Mallette]

I believe that I answered this on SO:

https://stackoverflow.com/q/49664586/1831717

was there something still not working?

--
You received this message because you are subscribed to the Google Groups "Gremlin-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to gremlin-users+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/cceb63aa-4fc0-41ba-9831-34b80e18a0dc%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Robert Dale]

Sounds like the configuration was updated after the initial database was created.  However:

The default setting is to disable multi- and meta-properties. [...] Once the configuration is set, it can not be changed for the lifetime of the graph.

Thus, the database will have to be removed and recreated with the desired configuration.

See also http://tinkerpop.apache.org/docs/current/reference/#_multi_meta_properties

Robert Dale

To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/CAA-H43-9nt9i2OgOfVjiivAK%3DKhvMfDGsHPircnoSY8t7F8z0g%40mail.gmail.com.

[Pavankumar B]

Hi, thanks for your reply.
I've at it and there has been some development.
I installed neo4j again and used this new db file.
I put the properties
gremlin.neo4j.multiProperties=true
gremlin.neo4j.metaProperties=true
and I did g.addV('User').property(set, '1','2').property(set, '1',3')

I got this
gremlin> g.V().valueMap().unfold()
==>1=[3, 2]

Seems like Once the data is inserted without the meta and multi properties,
It doesn't allow to add multi properties further even if the properties are set later on.
Now I'm trying to copy the data from that old db to this new one in which property array works

It sounds lame but I couldn't copy the database to a file and file back to the new db.
I am trying using 

graph.io(IoCore.gryo()).writeGraph("dfs.kryo")

graph.io(IoCore.gryo()).readGraph("dfs.kryo")

         \,,,/

         (o o)

-----oOOo-(3)-oOOo-----

plugin activated: tinkerpop.server

plugin activated: tinkerpop.utilities

plugin activated: tinkerpop.neo4j

plugin activated: tinkerpop.tinkergraph

gremlin> graph = Neo4jGraph.open('/opt/gremlin-server/data/graph.db')

==>neo4jgraph[community single [/opt/gremlin-server/data/graph.db]]

gremlin> graph.io(IoCore.gryo()).writeGraph("dfs.kryo")

==>null

gremlin>

Am I doing the right thing?
Thank you again

[Pavankumar B]

I doesn't copy to the file but gives null

[Stephen Mallette]

Does this:

graph.io(IoCore.gryo()).writeGraph("dfs.kryo")

produce a dfs.kryo file? or does that give you the null? or do you get the null on the reading of that file?

--

You received this message because you are subscribed to the Google Groups "Gremlin-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to gremlin-users+unsubscribe@googlegroups.com.

To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/1ce98259-5385-4adc-a49b-00c4472eea54%40googlegroups.com.

[Robert Dale]

First, the properties are:

gremlin.neo4j.multiProperties=true

gremlin.neo4j.metaProperties=true

Those turn on features within the Gremlin implementation.  The 'gremlin.neo4j.conf' namespace is passed to Neo4j itself.

Using conf/neo4j-standalone.properties:

gremlin.graph=org.apache.tinkerpop.gremlin.neo4j.structure.Neo4jGraph

gremlin.neo4j.directory=/tmp/neo4j

gremlin.neo4j.multiProperties=true

gremlin.neo4j.metaProperties=true

gremlin> graph = GraphFactory.open('conf/neo4j-standalone.properties')

WARN  org.apache.tinkerpop.gremlin.neo4j.structure.Neo4jGraph  - Neo4jGraph multi/meta-properties feature is considered experimental and should not be used in a production setting until this warning is removed

==>neo4jgraph[community single [/tmp/neo4j]]

gremlin> g = graph.traversal()

==>graphtraversalsource[neo4jgraph[community single [/tmp/neo4j]], standard]

gremlin>  g.addV('User').property(set, '1','2').property(set, '1','3')

==>v[0]

gremlin> g.V().valueMap(true)

==>[1:[2,3],label:User,id:0]

gremlin> g.V().properties().valueMap(true)

==>[value:2,key:1,id:99]

==>[value:3,key:1,id:100]

gremlin> 

gremlin> graph.io(gryo()).writeGraph("neo.kryo");

==>null

gremlin> graph.io(gryo()).readGraph("neo.kryo");

==>null

gremlin> g.V().valueMap(true)

==>[1:[3,2],label:User,id:0]

==>[1:[3,2],label:User,id:3]

gremlin> g.V().properties().valueMap(true)

==>[value:3,key:1,id:100]

==>[value:2,key:1,id:99]

==>[value:3,key:1,id:103]

==>[value:2,key:1,id:102]

Now you can see that it did in fact load the graph and added a new vertex with new properties.

Robert Dale

To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/CAA-H43-AGvwq%3Dfw9CKT%2BQVEFcWZZtkm1iTKCcs%2BDxHLROiWyQw%40mail.gmail.com.

[Pavankumar B]

It creates an empty file dfs.kryo and the gremlin prompt says null.

I think null is normal right? but the file created is empty.

gremlin> graph = Neo4jGraph.open('/opt/gremlin-server/data/graph.db')

==>neo4jgraph[community single [/opt/gremlin-server/data/graph.db]]

gremlin> graph.io(IoCore.gryo()).writeGraph("dfs.kryo")

==>null

gremlin>

I was doing it wrong at graph = Neo4jGraph.open('/opt/gremlin-server/data/graph.db')

I tried this graph = GraphFactory.open('conf/neo4j-standalone.properties')
and it worked.

To unsubscribe from this group and stop receiving emails from it, send an email to gremlin-user...@googlegroups.com.