Terence Yim created SPARK-20935:
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Summary: A daemon thread, "BatchedWriteAheadLog Writer", left
behind after terminating StreamContext.
Key: SPARK-20935
URL: https://issues.apache.org/jira/browse/SPARK-20935
Project: Spark
Issue Type: Bug
Components: Structured Streaming
Affects Versions: 2.1.1, 1.6.3
Reporter: Terence Yim
With batched write ahead log on by default in driver (SPARK-11731), if there is
no receiver based {{InputDStream}}, the "BatchedWriteAheadLog Writer" thread
created by {{BatchedWriteAheadLog}} never get shutdown.
The root cause is due to
https://github.com/apache/spark/blob/master/streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverTracker.scala#L168
that it never call {{ReceivedBlockTracker.stop()}} (which in turn call
{{BatchedWriteAheadLog.close()}}) if there is no receiver based input.
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