Erik Krogen created HDFS-10872:
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             Summary: Add MutableRate metrics for FSNamesystemLock operations
                 Key: HDFS-10872
                 URL: https://issues.apache.org/jira/browse/HDFS-10872
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
            Reporter: Erik Krogen
            Assignee: Erik Krogen


Add metrics for FSNamesystemLock operations to see, overall, how long each 
operation is holding the lock for. Use MutableRate metrics for now. 



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