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https://issues.apache.org/jira/browse/HDFS-7694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15119738#comment-15119738
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Junping Du commented on HDFS-7694:
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I have cherry-pick it to branch-2.6.
> FSDataInputStream should support "unbuffer"
> -------------------------------------------
>
> Key: HDFS-7694
> URL: https://issues.apache.org/jira/browse/HDFS-7694
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.7.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Fix For: 2.7.0, 2.6.4
>
> Attachments: HDFS-7694.001.patch, HDFS-7694.002.patch,
> HDFS-7694.003.patch, HDFS-7694.004.patch, HDFS-7694.005.patch
>
>
> For applications that have many open HDFS (or other Hadoop filesystem) files,
> it would be useful to have an API to clear readahead buffers and sockets.
> This could be added to the existing APIs as an optional interface, in much
> the same way as we added setReadahead / setDropBehind / etc.
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