Github user colorant commented on the pull request:
https://github.com/apache/spark/pull/1499#issuecomment-50301634
@mateiz , yep, the map tasks did spill and it seems contribute most to the
increased process time. though in my case only about 400K data been spilled to
disk per task. But it lead to 15 seconds more time for process. Say the task
time increased from 15 seconds to 30 seconds
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