ZanderXu opened a new pull request, #6645:
URL: https://github.com/apache/hadoop/pull/6645

   Normally, BlockManagerSafeMode will leave the safemode only if the number of 
reported block has reached the threshold. So it only involves BM, so the 
BMWrite lock is enough for it.
   
   But `checkAndProvisionSnapshotTrashRoots` in the `leaveSafeMode` needs to 
create some directories, so it needs FSWriteLock.


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