[jira] [Created] (BEAM-1256) SparkPipelineResult.StreamingMode should not return null on awaitTermination()

["Amit Sela (JIRA)" <ji...@apache.org>]

Amit Sela created BEAM-1256:
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             Summary: SparkPipelineResult.StreamingMode should not return null on awaitTermination()
                 Key: BEAM-1256
                 URL: https://issues.apache.org/jira/browse/BEAM-1256
             Project: Beam
          Issue Type: Bug
          Components: runner-spark
            Reporter: Amit Sela
            Assignee: Amit Sela
            Priority: Minor


Currently, {{SparkPipelineResult.StreamingMode}} will return {{null}} if {{JavaStreamingContext#awaitTerminationOrTimeout(Long)}} returns {{false}}.
This is wrong because this will always return {{false}} and so {{null}} because Spark's {{ContextWaiter}} will only return {{true}} if the context was stopped and this only happens after calling "awaitTermination".

Following Spark code:
awaitTermination returns the [state of stopped|https://github.com/apache/spark/blob/branch-1.6/streaming/src/main/scala/org/apache/spark/streaming/ContextWaiter.scala#L74]
But can only stopped via [notifyStopped|https://github.com/apache/spark/blob/branch-1.6/streaming/src/main/scala/org/apache/spark/streaming/ContextWaiter.scala#L44]
Which is only called by [StreamingContext#stop()|https://github.com/apache/spark/blob/branch-1.6/streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala#L714]



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