Imran Rashid created SPARK-17911:

             Summary: Scheduler does not messageScheduler for 
                 Key: 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:

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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