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https://issues.apache.org/jira/browse/HDFS-6363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15027921#comment-15027921
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Mingliang Liu commented on HDFS-6363:
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+1 (non-binding)
> Improve concurrency while checking inclusion and exclusion of datanodes
> -----------------------------------------------------------------------
>
> Key: HDFS-6363
> URL: https://issues.apache.org/jira/browse/HDFS-6363
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Benoy Antony
> Assignee: Benoy Antony
> Labels: BB2015-05-TBR
> Attachments: HDFS-6363-002.patch, HDFS-6363.patch
>
>
> HostFileManager holds two effectively immutable objects - includes and
> excludes. These two objects can be safely published together using a volatile
> container instead of synchronizing for all mutators and accessors.
> This improves the concurrency while using HostFileManager.
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