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https://issues.apache.org/jira/browse/HDFS-10682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chen Liang updated HDFS-10682:
------------------------------
    Attachment: HDFS-10682-branch-2.002.patch

re-submitted a patch for branch-2

> 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-branch-2.001.patch, 
> HDFS-10682-branch-2.002.patch, 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
>
>
> 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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