Imran Rashid updated SPARK-17911:
    Summary: Scheduler does not need messageScheduler for ResubmitFailedStages  
(was: Scheduler does not messageScheduler for ResubmitFailedStages)

> Scheduler does not need 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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