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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7531) Improve the concurrent access on FsVolumeList
Date Wed, 17 Dec 2014 23:44:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250828#comment-14250828

Hadoop QA commented on HDFS-7531:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision f2d150e.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:


Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/9061//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/9061//console

This message is automatically generated.

> Improve the concurrent access on FsVolumeList
> ---------------------------------------------
>                 Key: HDFS-7531
>                 URL: https://issues.apache.org/jira/browse/HDFS-7531
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.6.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>         Attachments: HDFS-7531.000.patch, HDFS-7531.001.patch, HDFS-7531.002.patch
> {{FsVolumeList}} uses {{synchronized}} to protect the update on {{FsVolumeList#volumes}},
while various operations (e.g., {{checkDirs()}}, {{getAvailable()}}) iterate {{volumes}} without
> This JIRA proposes to use {{AtomicReference}} to encapture {{volumes}} to provide better
concurrent access.

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