ZanderXu opened a new pull request, #6656:
URL: https://github.com/apache/hadoop/pull/6656

   HeartbeatManager and DatanodeAdminMonitor support fine-grained lock.
   
   
   `blockManager.processExtraRedundancyBlocksOnInService(node)` in 
`stopMaintenance` and `stopDecommission` involves storage policy, so it needs 
FSReadLock.
   
   `isSufficient` in `DatanodeAdminDefaultMonitor` involves UC files, so it 
needs FSReadLock.
   
   `isBlockReplicatedOk`  in `DatanodeAdminBackoffMonitor` involves UC files, 
so it needs FSReadLock.


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