Kay Ousterhout created SPARK-19502:
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Summary: Remove unnecessary code to re-submit stages in the
DAGScheduler
Key: SPARK-19502
URL: https://issues.apache.org/jira/browse/SPARK-19502
Project: Spark
Issue Type: Bug
Components: Scheduler
Affects Versions: 1.1.1
Reporter: Kay Ousterhout
Assignee: Kay Ousterhout
Priority: Minor
There are a [few lines of code in the
DAGScheduler](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L1215)
to re-submit shuffle map stages when some of the tasks fail. My understanding
is that there should be a 1:1 mapping between pending tasks (which are tasks
that haven't completed successfully) and available output locations, so that
code should never be reachable. Furthermore, the approach taken by that code
(to re-submit an entire stage as a result of task failures) is not how we
handle task failures in a stage (the lower-level scheduler resubmits the
individual tasks) which is what the 5-years-old TODO on that code seems to be
implying should be done.
The big caveat is that there's a bug being fixed in SPARK-19263 that means
there is *not* a 1:1 relationship between pendingTasks and available
outputLocations, so that code is serving as a (buggy) band-aid. This should be
fixed once we resolve SPARK-19263.
cc [~imranr] [~markhamstra] [~jinxing6...@126.com]
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