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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10742) Measurement of lock held time in FsDatasetImpl
Date Tue, 09 Aug 2016 20:42:21 GMT
Chen Liang created HDFS-10742:
---------------------------------

             Summary: Measurement of lock held time in FsDatasetImpl
                 Key: HDFS-10742
                 URL: https://issues.apache.org/jira/browse/HDFS-10742
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
    Affects Versions: 3.0.0-alpha2
            Reporter: Chen Liang
            Assignee: Chen Liang


This JIRA proposes to measure the time the of lock of {{FsDatasetImpl}} is held by a thread.
Doing so will allow us to measure lock statistics.

This can be done by extending the {{AutoCloseableLock}} lock object in {{FsDatasetImpl}}.
In the future we can also consider replacing the lock with a read-write lock.



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