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From sumitchawla <...@git.apache.org>
Subject [GitHub] incubator-beam pull request #1061: BEAM-724 - Null pointer fix
Date Thu, 06 Oct 2016 19:43:29 GMT
GitHub user sumitchawla opened a pull request:

    https://github.com/apache/incubator-beam/pull/1061

    BEAM-724 - Null pointer fix

    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:
    
    ```
    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
    ```

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/sumitchawla/incubator-beam beam_724_fix

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-beam/pull/1061.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1061
    
----
commit 5da04d6a1c79e2daf17da435030dffad07a1d175
Author: Sumit Chawla <sumichaw@cisco.com>
Date:   2016-10-06T19:42:20Z

    BEAM-724 - Null pointer fix

----


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