Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/6864#issuecomment-113980248
It's proved that increasing thread number of the local `SparkContext` used
by `TestHive` (and running the tests on a node with relatively more cores, say
our Jenkins builder) is pretty useful for detecting concurrency related bugs.
SPARK-8501 and SPARK-8513 are both detected by this means.
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