Github user andrewor14 commented on the pull request:

    https://github.com/apache/spark/pull/6430#issuecomment-106597721
  
    Another related problem with or without my suggested change: we actually 
call `updateAndSync...` quite often (every 100ms). While we're initializing 
we'll end up flooding the AM with `requestTotalExecutors` messages. Maybe this 
is not a huge problem but it's something to look out for.


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