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https://issues.apache.org/jira/browse/HDFS-7531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14249243#comment-14249243
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Colin Patrick McCabe commented on HDFS-7531:
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+1. Thanks, Eddy.
> 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
>
>
> {{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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