Can't set list as a property

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Tomasz Jurczyk

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Nov 20, 2019, 8:39:14 AM11/20/19

to Gremlin-users

Hi,

I'm trying to set a list as a property and so far without much luck. I'm running latest janusgraph docker and 3.4.1 gremlinpython.

>>> g.addV('person').property('name','john').iterate()
[['addV', 'person'], ['property', 'name', 'john'], ['none']]
>>> g.addV('person').property('name','john').next()
v[8368]
>>> g.V(8368).valueMap().toList()
[{'name': ['john']}]

>>> g.V(8368).property(list, 'name', 'johnny').next()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/process/traversal.py", line 88, in next
    return self.__next__()
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/process/traversal.py", line 47, in __next__
    self.traversal_strategies.apply_strategies(self)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/process/traversal.py", line 506, in apply_strategies
    traversal_strategy.apply(traversal)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/remote_connection.py", line 148, in apply
    remote_traversal = self.remote_connection.submit(traversal.bytecode)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/driver_remote_connection.py", line 54, in submit
    results = result_set.all().result()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/_base.py", line 432, in result
    return self.__get_result()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/resultset.py", line 90, in cb
    f.result()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/_base.py", line 425, in result
    return self.__get_result()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/thread.py", line 56, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/connection.py", line 80, in _receive
    status_code = self._protocol.data_received(data, self._results)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/protocol.py", line 110, in data_received
    raise GremlinServerError(message["status"])
gremlin_python.driver.protocol.GremlinServerError: 599: null:property([[], name, johnny])

The server is also throwing an error:

24725609 [gremlin-server-worker-1] ERROR org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor  - Could not deserialize the Traversal instance
java.lang.IllegalStateException: null:property([[], name, johnny])
	at org.apache.tinkerpop.gremlin.jsr223.JavaTranslator.invokeMethod(JavaTranslator.java:250)
	at org.apache.tinkerpop.gremlin.jsr223.JavaTranslator.translate(JavaTranslator.java:87)
	at org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor.iterateBytecodeTraversal(TraversalOpProcessor.java:360)
	at org.apache.tinkerpop.gremlin.server.handler.OpExecutorHandler.channelRead0(OpExecutorHandler.java:68)
	at org.apache.tinkerpop.gremlin.server.handler.OpExecutorHandler.channelRead0(OpExecutorHandler.java:43)
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
	at io.netty.handler.codec.http.websocketx.Utf8FrameValidator.channelRead(Utf8FrameValidator.java:77)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler$1.channelRead(WebSocketServerProtocolHandler.java:204)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:582)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tinkerpop.gremlin.jsr223.JavaTranslator.invokeMethod(JavaTranslator.java:244)
	... 57 more
Caused by: java.lang.IllegalArgumentException: The provided key/value array length must be a multiple of two
	at org.apache.tinkerpop.gremlin.structure.Element$Exceptions.providedKeyValuesMustBeAMultipleOfTwo(Element.java:126)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.Parameters.set(Parameters.java:177)
	at org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.AddPropertyStep.configure(AddPropertyStep.java:78)
	at org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal.property(GraphTraversal.java:2114)
	at org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal.property(GraphTraversal.java:2142)
	... 61 more
24725610 [gremlin-server-worker-1] WARN  org.apache.tinkerpop.gremlin.server.handler.OpExecutorHandler  - Could not deserialize the Traversal instance
org.apache.tinkerpop.gremlin.server.op.OpProcessorException: Could not deserialize the Traversal instance
	at org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor.iterateBytecodeTraversal(TraversalOpProcessor.java:368)
	at org.apache.tinkerpop.gremlin.server.handler.OpExecutorHandler.channelRead0(OpExecutorHandler.java:68)
	at org.apache.tinkerpop.gremlin.server.handler.OpExecutorHandler.channelRead0(OpExecutorHandler.java:43)
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
	at io.netty.handler.codec.http.websocketx.Utf8FrameValidator.channelRead(Utf8FrameValidator.java:77)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler$1.channelRead(WebSocketServerProtocolHandler.java:204)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:582)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
	at java.lang.Thread.run(Thread.java:748)
11/20/19 9:39:47 AM ============================================================

I'm out of ideas, can anyone help? Thanks!

Stephen Mallette

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Nov 20, 2019, 8:46:45 AM11/20/19

to gremli...@googlegroups.com

how did you import "list" in:

g.V(8368).property(list, 'name', 'johnny').next()

are you sure that's referring to Cardinality? Perhaps try:

g.V(8368).property(Cardinality.list, 'name', 'johnny').next()

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Tomasz Jurczyk

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Nov 20, 2019, 4:58:42 PM11/20/19

to Gremlin-users

Thanks Stephen, that's a good point. I didn't have it imported. Fixed it by

from gremlin_python.process.traversal import Cardinality

and then the following doesn't throw the error, but it's now complaining about the cardinality being defined as SINGLE. The error trace is below.

I'm trying to follow the tinkerpop manual: http://tinkerpop.apache.org/docs/current/reference/#vertex-properties

When I run it through the gremlin console everything works, but when working on gremlin-python and using Remote connection, not quite. I would appreciate any help.

>>> g.V(v).property(Cardinality.list_, 'name', 'johny').iterate()

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>

  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/process/traversal.py", line 65, in iterate
    try: self.nextTraverser()
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/process/traversal.py", line 70, in nextTraverser

    self.traversal_strategies.apply_strategies(self)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/process/traversal.py", line 506, in apply_strategies
    traversal_strategy.apply(traversal)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/remote_connection.py", line 148, in apply
    remote_traversal = self.remote_connection.submit(traversal.bytecode)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/driver_remote_connection.py", line 54, in submit
    results = result_set.all().result()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/_base.py", line 432, in result
    return self.__get_result()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/resultset.py", line 90, in cb
    f.result()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/_base.py", line 425, in result
    return self.__get_result()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/concurrent/futures/thread.py", line 56, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/connection.py", line 80, in _receive
    status_code = self._protocol.data_received(data, self._results)
  File "/Users/george/.pyenvs/python3/lib/python3.6/site-packages/gremlin_python/driver/protocol.py", line 110, in data_received
    raise GremlinServerError(message["status"])

gremlin_python.driver.protocol.GremlinServerError: 500: Key is defined for SINGLE cardinality which conflicts with specified: list

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Stephen Mallette

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Nov 21, 2019, 6:52:24 AM11/21/19

to gremli...@googlegroups.com

I think the pertinent part to you error is:

Key is defined for SINGLE cardinality which conflicts with specified: list

I assume that error is from JanusGraph and that it just means that you don't have your schema defined properly:

https://docs.janusgraph.org/basics/schema/#property-key-cardinality

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