Mark Grover created SPARK-21525:
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Summary: ReceiverSupervisorImpl seems to ignore the error code
when writing to the WAL
Key: SPARK-21525
URL: https://issues.apache.org/jira/browse/SPARK-21525
Project: Spark
Issue Type: Bug
Components: DStreams
Affects Versions: 2.2.0
Reporter: Mark Grover
{{AddBlock}} returns an error code related to whether writing the block to the
WAL was successful or not. In cases where a WAL may be unavailable temporarily,
the write would fail but it seems like we are not using the return code (see
[here|https://github.com/apache/spark/blob/ba8912e5f3d5c5a366cb3d1f6be91f2471d048d2/streaming/src/main/scala/org/apache/spark/streaming/receiver/ReceiverSupervisorImpl.scala#L162]).
For example, when using the Flume Receiver, we should be sending a n'ack back
to Flume if the block wasn't written to the WAL. I haven't gone through the
full code path yet but at least from looking at the ReceiverSupervisorImpl, it
doesn't seem like that return code is being used.
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