virajjasani opened a new pull request, #5533:
URL: https://github.com/apache/hadoop/pull/5533

   Mount table resolver location cache gets invalidated by taking write lock as 
part of addEntry/removeEntry/refreshEntries calls. Since the write lock 
exclusively updates the cache, getDestinationForPath already takes read lock 
before accessing the cache. Similarly, retrieval of the cache size should also 
take the read lock.


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