[jira] [Created] (SPARK-17911) Scheduler does not messageScheduler for ResubmitFailedStages

["Imran Rashid (JIRA)" <ji...@apache.org>]

Imran Rashid created SPARK-17911:
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             Summary: Scheduler does not messageScheduler for ResubmitFailedStages
                 Key: SPARK-17911
                 URL: https://issues.apache.org/jira/browse/SPARK-17911
             Project: Spark
          Issue Type: Improvement
          Components: Scheduler
    Affects Versions: 2.0.0
            Reporter: Imran Rashid


Its not totally clear what the purpose of the {{messageScheduler}} is in {{DAGScheduler}}.  It can perhaps be eliminated completely; or perhaps we should just clearly document its purpose.

This comes from a long discussion w/ [~markhamstra] on an unrelated PR here: https://github.com/apache/spark/pull/15335/files/c80ad22a242255cac91cce2c7c537f9b21100f70#diff-6a9ff7fb74fd490a50462d45db2d5e11

But its tricky so breaking it out here for archiving the discussion.

Note: this issue requires a decision on what to do before a code change, so lets just discuss it on jira first.



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