Github user YanTangZhai commented on the pull request:
https://github.com/apache/spark/pull/1618#issuecomment-50425621
Hi @andrewor14 The default values of the two max limits are zero, which
does not change the original operating mode and does not fail an application
that is running perfectly fine. If some application has skew data which we
don't expect, it will run for a very long time. In contrast, we want this
application fail fast.
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