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From rost...@informatik.uni-leipzig.de
Subject Problem with Summerization
Date Tue, 27 Jun 2017 18:48:36 GMT
Dear All,

I do not understand what the error in the following code can be?

Graph<GradoopId, Long, NullValue> gellyGraph = ...

Graph<GradoopId,Summarization.VertexValue<Long>,  
Summarization.EdgeValue<NullValue>> g =
                             gellyGraph.run(new  
Summarization<GradoopId, Long, NullValue>());

g.getVertices().print(); //this one works fine
g.getEdges().print();    //this one gives the following error

...
org.apache.flink.types.NullFieldException: Field 2 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.runtime.operators.util.metrics.CountingCollector.collect(CountingCollector.java:35)
	at  
org.apache.flink.graph.library.Summarization$VertexGroupReducer.reduce(Summarization.java:318)
	at  
org.apache.flink.runtime.operators.GroupReduceDriver.run(GroupReduceDriver.java:131)
	at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:486)
	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:748)

I also tried with different types for EdgeValue. The same error appears.
When I look at the result vertices, everything looks fine.
But the result edges has this problem.

Any idea?

Regards,
Ali


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