lei w created HDFS-17523:
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             Summary: Add  fine-grained locks metrics in DataSetLockManager
                 Key: HDFS-17523
                 URL: https://issues.apache.org/jira/browse/HDFS-17523
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: lei w


Currently we use fine-grained locks to manage FsDataSetImpl. But we did not add 
lock-related metrics. In some cases, we actually need lock-holding information 
to understand the time-consuming lock-holding of a certain operation. Using 
this information, we can also optimize some long-term lock operations as early 
as possible.



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