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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10682) Replace FsDatasetImpl object lock with a separate lock object
Date Mon, 08 Aug 2016 23:07:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412623#comment-15412623
] 

Hadoop QA commented on HDFS-10682:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  7s{color} | {color:red}
HDFS-10682 does not apply to branch-2. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12822684/HDFS-10682-branch-2.001.patch
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| JIRA Issue | HDFS-10682 |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/16345/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> 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-10682.001.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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