Kay Ousterhout created SPARK-19560:
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Summary: Improve tests for when DAGScheduler learns of
"successful" ShuffleMapTask from a failed executor
Key: SPARK-19560
URL: https://issues.apache.org/jira/browse/SPARK-19560
Project: Spark
Issue Type: Test
Components: Scheduler
Affects Versions: 2.1.1
Reporter: Kay Ousterhout
Assignee: Kay Ousterhout
Priority: Minor
There's some tricky code around the case when the DAGScheduler learns of a
ShuffleMapTask that completed successfully, but ran on an executor that failed
sometime after the task was launched. This case is tricky because the
TaskSetManager (i.e., the lower level scheduler) thinks the task completed
successfully, but the DAGScheduler considers the output it generated to be no
longer valid (because it was probably lost when the executor was lost). As a
result, the DAGScheduler needs to re-submit the stage, so that the task can be
re-run. This is tested in some of the tests but not clearly documented, so we
should improve this to prevent future bugs (this was encountered by
[~markhamstra] in attempting to find a better fix for SPARK-19263).
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