Github user watermen commented on the pull request:
https://github.com/apache/spark/pull/7210#issuecomment-122786160
@liancheng I see `coalesce` will take locality and load balance(the number
of partitions in each group) into
account(https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/CoalescedRDD.scala#L292),
is it better to take the sum of partition length(part1.len + part2.len + ... +
partN.len) in each group?
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