Github user jerryshao commented on the pull request:

    https://github.com/apache/spark/pull/6870#issuecomment-117867140
  
    Hi @squito , thanks a lot for your comments, greatly appreciate it. I think 
the total blacklist executor number is controlled by 
`spark.scheduler.blacklist.maxBlacklistFraction`, which is 0.5 by default, 
means the number of blacklisted executors should not be more than half of the 
whole cluster.


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