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https://issues.apache.org/jira/browse/HDFS-6363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13993645#comment-13993645
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Benoy Antony commented on HDFS-6363:
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To understand more on the validity of this safe publication approach, please
see
https://issues.apache.org/jira/browse/HADOOP-10448?focusedCommentId=13980112
> 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
> Attachments: 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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