Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/3695#issuecomment-66946690
@tdas @JoshRosen Since the directories are created atomically each time the
suite is run, conflicts reported in SPARK-4826 was likely caused by multiple
tests running at the same time and using the same filename (since the
writeLogSegments method is not thread-safe).
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