zhangshuyan0 opened a new pull request, #5471:
URL: https://github.com/apache/hadoop/pull/5471
…. Contributed by Shuyan Zhang.
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### Description of PR
Cherry-pick from trunk.
The remove method in LowRedundancyBlocks is not protected by synchronized.
This method is private and is called by BlockManager. As a result,
priorityQueues has the risk of being accessed concurrently by multiple threads.
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