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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HDFS-10682) Replace FsDatasetImpl object lock with a separate lock object
Date Mon, 08 Aug 2016 22:41:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Arpit Agarwal reopened HDFS-10682:

> Replace FsDatasetImpl object lock with a separate lock object
> -------------------------------------------------------------
>                 Key: HDFS-10682
>                 URL: https://issues.apache.org/jira/browse/HDFS-10682
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>             Fix For: 3.0.0-alpha2
>         Attachments: HDFS-10682.001.patch, HDFS-10682.002.patch, HDFS-10682.003.patch,
HDFS-10682.004.patch, HDFS-10682.005.patch, HDFS-10682.006.patch, HDFS-10682.007.patch, HDFS-10682.008.patch,
HDFS-10682.009.patch, HDFS-10682.010.patch, HDFS-10682.branch-2.8.001.patch
> This Jira proposes to replace the FsDatasetImpl object lock with a separate lock object.
Doing so will make it easier to measure lock statistics like lock held time and warn about
potential lock contention due to slow disk operations.
> Right now we can use org.apache.hadoop.util.AutoCloseableLock. In the future we can also
consider replacing the lock with a read-write lock.

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