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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10742) Measurement of lock held time in FsDatasetImpl
Date Thu, 25 Aug 2016 17:58:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chen Liang updated HDFS-10742:
------------------------------
    Attachment: HDFS-10742.007.patch

Thanks [~chris.douglas] for the comments! 

Updated a patch to fix Jenkins findbugs complains. Also reverted an unnecessary change from
previous patch that could be misleading. Will update with unit test later on.

Apart from this. I'm considering using hadoop's built-in metric system, instead of maintaining
and printing locally maintained stats, what do you think about this?

> 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
>
>
> 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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