Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/11487#issuecomment-193249061
@srowen
> My question was more like, does the extra locking cause trouble in 2.11?
I know you said 2.11 doesn't need this change per se.
I think the extra locking cause a little performance penalty while building
logical plan in a driver process but it is much smaller than execution time.
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