deshanxiao commented on issue #15267: [SPARK-17667] [YARN][WIP]Make locking fine grained in YarnAllocator#enqueueGetLossReasonRequest URL: https://github.com/apache/spark/pull/15267#issuecomment-557436677 I meet this problem in spark 2.1 just now. RPC threads are all blocked by the lock.
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