Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/3695#issuecomment-66995767
The fix in https://github.com/apache/spark/pull/3701 looks simpler but it's
fixing a different supposed cause. Is it really that the random method produces
the same string many times, because of a race condition or something? seems
like synchronization would fix that then. The alternate method in the other PR
may do the same.
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