Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/1603#issuecomment-50246388
I have not analyzed in detail, but this looks like something which might
cause deadlocks ..
Changing to logging instead of throwing exception is a good idea though :
earlier we were not exit'ing in case of uncaught exception - which was
introduced in some subsequent release - so this should be done now (logError).
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