Github user XuefengWu commented on the pull request:
https://github.com/apache/spark/pull/3380#issuecomment-64148623
this unit test is try to verify the local metrics, but the
shuffleReadMetrics measure time fetch data. It dependence on number of
partitions and read time. In my desktop, when the number of partitions is the
some as cores, the shuffle read time alway be zero. So I hacked the
blockManager, it always sleep 1 millis, to make sure shuffleReadMetrics
fetchWaitTime more than zero.
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