How to configure properties types in JanusGraph?

[Tomasz]

I want to create vertex with 'confirmed' property which should be a boolen data type. Currently, when I add vertex I do it as follows:

 g.addV('Sample').property(confirmed', '0')

The '0' value is string type. I want to insert the value which will be the boolen type.

I found information about configuring data types in Janus: http://docs.janusgraph.org/latest/schema.html. According to it, I can do it as follows:

mgmt = graph.openManagement() 
confirmed = mgmt.makePropertyKey('confirmed').dataType(Boolean.class).cardinality(Cardinality.SINGLE).make() 
mgmt.commit()

 
I use gremlin-python, that's why I ask here not in JanusGraph groups. I try to execute above code on my graph object which is Graph class type (graph = Graph(), Graph is - from gremlin_python.structure.graph import Graph) but I get an error that there is no openManagement() method on graph object.

I confused how to pass that configutation via gremlin-python to Janus Graph. Maybe I should do in not via Gremlin but in some configuration file od JanusGraph.

How can I add a property of certain type using gremlin-python to JanusGraph database?

[Robert Dale]

GLVs only support the traversal API. Schema management is database-specific. Thus, you will need to submit database schema changes as a script to be evaluated on the remote Gremlin Server. You can use the gremlin-python driver to submit scripts.  Be sure to use the matching version (JanusGraph 0.2 -> TinkerPop 3.2.6).

See also http://tinkerpop.apache.org/docs/3.2.6/reference/#connecting-via-python

Robert Dale

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[Jason Plurad]

Dave Brown had an example of how to send a schema transaction via Python client on this thread on janusgraph-users
https://groups.google.com/forum/m/?source=mog&gl=us#!topic/janusgraph-users/4aEjYjvzhX8

On Sat, Oct 21, 2017 at 4:53 AM Robert Dale <rob...@gmail.com> wrote:

GLVs only support the traversal API. Schema management is database-specific. Thus, you will need to submit database schema changes as a script to be evaluated on the remote Gremlin Server. You can use the gremlin-python driver to submit scripts.  Be sure to use the matching version (JanusGraph 0.2 -> TinkerPop 3.2.6).

See also http://tinkerpop.apache.org/docs/3.2.6/reference/#connecting-via-python

Robert Dale

On Sat, Oct 21, 2017 at 4:34 AM, Tomasz <troj...@gmail.com> wrote:

I want to create vertex with 'confirmed' property which should be a boolen data type. Currently, when I add vertex I do it as follows:

 g.addV('Sample').property(confirmed', '0')

The '0' value is string type. I want to insert the value which will be the boolen type.

I found information about configuring data types in Janus: http://docs.janusgraph.org/latest/schema.html. According to it, I can do it as follows:

mgmt = graph.openManagement() 
confirmed = mgmt.makePropertyKey('confirmed').dataType(Boolean.class).cardinality(Cardinality.SINGLE).make() 
mgmt.commit()

 
I use gremlin-python, that's why I ask here not in JanusGraph groups. I try to execute above code on my graph object which is Graph class type (graph = Graph(), Graph is - from gremlin_python.structure.graph import Graph) but I get an error that there is no openManagement() method on graph object.

I confused how to pass that configutation via gremlin-python to Janus Graph. Maybe I should do in not via Gremlin but in some configuration file od JanusGraph.

How can I add a property of certain type using gremlin-python to JanusGraph database?

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[Tomasz]

Thank you for information.
I have another problem, I added a datatype to number and it works but I get a warning:

458911 [gremlin-server-exec-2] WARN  org.apache.tinkerpop.gremlin.server.op.AbstractEvalOpProcessor  - Exception processing a script on request [RequestMessage{, requestId=a2de96bf-ccf5-4bf0-9332-a8e5fd3d4cbb, op='eval', processor='', args={gremlin=mgmt = graph.openManagement()
                number = mgmt.makePropertyKey('number').dataType(Integer.class).cardinality(Cardinality.SINGLE).make()
                mgmt.commit(), aliases={g=g}}}].
org.janusgraph.core.SchemaViolationException: Adding this property for key [~T$SchemaName] and value [rt number] violates a uniqueness constraint [SystemIndex#~T$SchemaName]
    at org.janusgraph.graphdb.transaction.StandardJanusGraphTx.addProperty(StandardJanusGraphTx.java:793)
    at org.janusgraph.graphdb.transaction.StandardJanusGraphTx.addProperty(StandardJanusGraphTx.java:722)
    at org.janusgraph.graphdb.transaction.StandardJanusGraphTx.makeSchemaVertex(StandardJanusGraphTx.java:849)
    at org.janusgraph.graphdb.transaction.StandardJanusGraphTx.makePropertyKey(StandardJanusGraphTx.java:869)
    at org.janusgraph.graphdb.types.StandardPropertyKeyMaker.make(StandardPropertyKeyMaker.java:100)
    at org.janusgraph.core.schema.PropertyKeyMaker$make$7.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
    at Script8.run(Script8.groovy:2)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:843)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:548)
    at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233)
    at org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines.eval(ScriptEngines.java:120)
    at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:290)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

I don't understand what means that it "violates a uniqueness constraint". Could you explain me it?

[Jason Plurad]

You typically see that error when you're trying to define a property key that already exists. You should check with the management system if the property exists before creating it.

[Tomasz]

My question is related to the code:

mgmt = graph.openManagement()
number = mgmt.makePropertyKey('number').dataType(Integer.class).cardinality(Cardinality.SINGLE).make()

...
...
mgmt.commit()

Should I run the code each time when I start my app or should I run it 'once' and it will be saved somewhere is JanusGraph config?

[Robert Dale]

The schema is persisted to the database and becomes available to all graph instances.

Robert Dale

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