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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10742) Measurement of lock held time in FsDatasetImpl
Date Thu, 08 Sep 2016 21:23:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15475060#comment-15475060
] 

Erik Krogen commented on HDFS-10742:
------------------------------------

For v16 patch IIUC you actually still have the default set at 2s (FsDatasetImpl line 287)

> 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, HDFS-10742.012.patch, HDFS-10742.013.patch,
HDFS-10742.014.patch, HDFS-10742.015.patch, HDFS-10742.016.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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