Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9661#issuecomment-157185760
@davies I don't _necessarily_ think we have to revert first. The original
change did fix SPARK-11016 and, eh, sort of fixed one type of issue described
by SPARK-11271 but really introduced a different related potential problem.
This is a further improvement that happens to walk back part of the change.
Keep in mind the original PR is in branch 1.6 so I want to make sure we
leave 1.6 in a good state if it's going to be cut soon.
This PR does not include a fix for SPARK-11016. Adding it would technically
cause that problem to occur again. I think it would have to include some of the
changes proposed by Charles Allen in the JIRA. Not hard.
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