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https://issues.apache.org/jira/browse/FLINK-4823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15588046#comment-15588046
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Sajeev Ramakrishnan commented on FLINK-4823:
--------------------------------------------
I could figure out the issue.
This issue is coming when the keys in edges are not getting mapped with
vertices.
I think this can be handled in gelly api
> org.apache.flink.types.NullFieldException: Field 0 is null, but expected to
> hold a value
> ----------------------------------------------------------------------------------------
>
> Key: FLINK-4823
> URL: https://issues.apache.org/jira/browse/FLINK-4823
> Project: Flink
> Issue Type: Bug
> Components: Gelly
> Affects Versions: 1.1.0
> Environment: RHEL 6.6
> Reporter: Sajeev Ramakrishnan
> Priority: Blocker
>
> Team,
> We are getting NULL pointer exception while doing the vertex centric graph
> traversal.
> org.apache.flink.types.NullFieldException: Field 0 is null, but expected to
> hold a value.
> at
> org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:126)
> at
> org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:30)
> at
> org.apache.flink.runtime.plugable.SerializationDelegate.write(SerializationDelegate.java:56)
> at
> org.apache.flink.runtime.io.network.api.serialization.SpanningRecordSerializer.addRecord(SpanningRecordSerializer.java:83)
> at
> org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:85)
> at
> org.apache.flink.runtime.operators.shipping.OutputCollector.collect(OutputCollector.java:65)
> at
> org.apache.flink.api.java.operators.JoinOperator$DefaultJoin$WrappingFlatJoinFunction.join(JoinOperator.java:572)
> at
> org.apache.flink.runtime.operators.JoinWithSolutionSetFirstDriver.run(JoinWithSolutionSetFirstDriver.java:196)
> at
> org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:486)
> at
> org.apache.flink.runtime.iterative.task.AbstractIterativeTask.run(AbstractIterativeTask.java:146)
> at
> org.apache.flink.runtime.iterative.task.IterationIntermediateTask.run(IterationIntermediateTask.java:92)
> at
> org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:351)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
> at
> org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:122)
> at
> org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:30)
> at
> org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:124)
> ... 13 more
> All the parameters that I am passing for the vertex and edges are not null.
> Not able to find out the root cause.
> Thanks & Regards,
> Sajeev Ramakrishnan
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