Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/4964#issuecomment-82206526
Offline discussion with @harishreedharan : There are cases that this fix
does not cover, and doing a principled approach that handles the case where
concurrentJobs > 1 (which is not officially supported) requires a non-trivial
refactoring. In fact, for concurrentJobs > 1, there were existing bugs
independent of the regression referred to in SPARK-6222. So that makes this
issue not really a regression for officially non-supported cases of
concurrentJobs > 1. To fix the regression SPARK-6222 for the the default,
officially supported case of concurrentJobs = 1, we are going to use the
surgical fix in PR #5008.
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