Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/4001#issuecomment-70609080
@baishuo Would you mind closing this PR? The `Driver.plan` field is not
properly synchronized; otherwise we wouldn't need the synchronization at all.
And other parts of `Driver` are not obviously thread-safe. Considering DDL
operations is infrequent, synchronize the whole function is both safe and
performance insensitive.
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