Github user kevinyu98 commented on the pull request:

    https://github.com/apache/spark/pull/10314#issuecomment-169238048
  
    @viirya @yhuai @srowen @marmbrus @concretevitamin: 
SHUFFLE_TARGET_POSTSHUFFLE_INPUT_SIZE was added by spark-9850, PR#9276, I am 
including Yin , 
    Michael set the autoBroadcastJoinThreshold to 10 * 1024 * 1024 through 
PR3064,
    spark-2393 set the autoBroadcastJoinThreshold to Int.
    I am not sure which one to choose either, so I cc on the persons who 
introduce these two fields. Thanks for your input. 


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