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https://issues.apache.org/jira/browse/HDFS-6363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoy Antony updated HDFS-6363:
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Attachment: HDFS-6363.patch
A new container class _HostSetPair_ is defined. This holds includes and
excludes as its fields. The instance of _HostSetPair_ in HostFileManager is
defined _volatile_
Since _HostSetPair_ is immutable and is safely published via volatile, its
state can be accessed from different threads without lock.
To understand more on the validity of this safe publication approach, please
seehttps://issues.apache.org/jira/browse/HADOOP-10448?focusedCommentId=13980112
Since there is no change in functionality , no tests are modified or added.
> 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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