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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