Github user jongyoul commented on the pull request:

    https://github.com/apache/spark/pull/4170#issuecomment-80798498
  
    @elyast Thanks for interesting this PR, which was about resources of cores 
and memory. I misunderstood how mesos works specially in memory side, so I 
closed this PR. However, I agree with you that executor cores are sometime too 
much. @tnachen we cannot adjust memory issue, but, changing executor cores is 
meaningful and should fix that executor has same cores with CPUS_PER_TASK 
initially. See TODO(pwendell) in MesosSchedulerBackend.scala. I want to fix 
this TODO to extract a configuration parameter. What do you think of it?


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