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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7531) Improve the concurrent access on FsVolumeList
Date Tue, 16 Dec 2014 19:10:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14248715#comment-14248715
] 

Lei (Eddy) Xu commented on HDFS-7531:
-------------------------------------

The failed test is not related. I have verified this test locally on a linux machine.

> 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
>
>
> {{FsVolumeList}} uses {{synchronized}} to protect the update on {{FsVolumeList#volumes}},
while various operations (e.g., {{checkDirs()}}, {{getAvailable()}}) iterate {{volumes}} without
protection.
> This JIRA proposes to use {{AtomicReference}} to encapture {{volumes}} to provide better
concurrent access.



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