Hi,
these are the outputs for a small test graph:
gellyGraph.getVertices().print();
(000000000000000000000003,9)
(000000000000000000000007,9)
(000000000000000000000005,5)
(000000000000000000000001,9)
(000000000000000000000006,9)
(000000000000000000000000,9)
(000000000000000000000004,9)
(000000000000000000000002,2)
(000000000000000000000008,8)
(000000000000000000000009,9)
(00000000000000000000000a,10)
gellyGraph.getEdges().print();
(000000000000000000000002,000000000000000000000001,(null))
(000000000000000000000006,000000000000000000000003,(null))
(000000000000000000000000,000000000000000000000001,(null))
(000000000000000000000008,000000000000000000000003,(null))
(000000000000000000000005,000000000000000000000006,(null))
(000000000000000000000009,000000000000000000000000,(null))
(000000000000000000000009,00000000000000000000000a,(null))
(000000000000000000000005,00000000000000000000000a,(null))
(000000000000000000000009,000000000000000000000004,(null))
(000000000000000000000005,000000000000000000000006,(null))
(000000000000000000000005,000000000000000000000007,(null))
(000000000000000000000009,000000000000000000000000,(null))
(000000000000000000000006,000000000000000000000007,(null))
(000000000000000000000004,000000000000000000000007,(null))
(000000000000000000000008,000000000000000000000007,(null))
(000000000000000000000002,000000000000000000000000,(null))
(000000000000000000000009,000000000000000000000001,(null))
(000000000000000000000005,000000000000000000000003,(null))
(000000000000000000000008,000000000000000000000006,(null))
(000000000000000000000000,000000000000000000000004,(null))
(000000000000000000000002,000000000000000000000004,(null))
(000000000000000000000007,000000000000000000000004,(null))
(000000000000000000000007,000000000000000000000006,(null))
(000000000000000000000004,000000000000000000000000,(null))
g.getVertices().print(); //correct results
(000000000000000000000005,(5,1))
(000000000000000000000002,(2,1))
(000000000000000000000008,(8,1))
(000000000000000000000004,(9,7))
(00000000000000000000000a,(10,1))
g.getEdges.print(); //error!!
As I said, I also tested when edges have values other than null
and the same problem appears.
Regards,
Ali
Quoting Greg Hogan <c...@greghogan.com>:
Hi Ali,
Could you print and include a gellyGraph which results in this error.
Greg
On Jun 27, 2017, at 2:48 PM, rost...@informatik.uni-leipzig.de wrote:
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
