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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10742) Measurement of lock held time in FsDatasetImpl
Date Fri, 02 Sep 2016 14:45:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15458717#comment-15458717
] 

Arpit Agarwal commented on HDFS-10742:
--------------------------------------

Hi [~chris.douglas], are you okay with proceeding? Was your concern was with exposing AutoCloseableLock
in hadoop utils or just an overall objection to this idiom even if it's not exposed outside
the DN.

> 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
>         Attachments: HDFS-10742.001.patch, HDFS-10742.002.patch, HDFS-10742.003.patch,
HDFS-10742.004.patch, HDFS-10742.005.patch, HDFS-10742.006.patch, HDFS-10742.007.patch, HDFS-10742.008.patch,
HDFS-10742.009.patch, HDFS-10742.010.patch, HDFS-10742.011.patch
>
>
> 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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