Sumit Chawla created BEAM-724:
---------------------------------
Summary: NullPointerException in Snapshot State
Key: BEAM-724
URL: https://issues.apache.org/jira/browse/BEAM-724
Project: Beam
Issue Type: Bug
Components: runner-flink
Reporter: Sumit Chawla
This seems like a timing Issue. Its reproducible in case where Kafka topic
does not exist yet. The UDF operator run is not called yet, but other thread
calls snapshot before that:
{code}
java.lang.RuntimeException: Error while triggering checkpoint for Source:
Read(UnboundedKafkaSource) -> ParDo(KafkaRecordToCTuple) ->
ParDo(NetFlowToFlowContentTransformation) ->
ParDo(FlowContentToRelationsTransformation) -> ParDo(GraphToJsonTransformation)
-> AnonymousParDo -> ParDo(KafkaWriter) (1/1)
at org.apache.flink.runtime.taskmanager.Task$2.run(Task.java:949)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Exception: Failed to draw state snapshot from function:
null
at
org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.snapshotOperatorState(AbstractUdfStreamOperator.java:132)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:598)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:565)
at org.apache.flink.runtime.taskmanager.Task$2.run(Task.java:941)
... 5 more
Caused by: java.lang.NullPointerException
at
org.apache.beam.runners.flink.translation.wrappers.streaming.io.UnboundedSourceWrapper.snapshotState(UnboundedSourceWrapper.java:340)
at
org.apache.beam.runners.flink.translation.wrappers.streaming.io.UnboundedSourceWrapper.snapshotState(UnboundedSourceWrapper.java:54)
at
org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.snapshotOperatorState(AbstractUdfStreamOperator.java:129)
... 8 more
{code}
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