ZanderXu opened a new pull request, #6641:
URL: https://github.com/apache/hadoop/pull/6641

   Using FSLock to make cache-pool and cache-directive thread safe, since 
Clients will access or modify these information and these information has 
nothing to do with block.
   
   Using BMLock to make cachedBlock thread safe, since the related logic will 
access block information and modify cache-related information of one DN.


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