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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7694) FSDataInputStream should support "unbuffer"
Date Sun, 24 Jan 2016 01:36:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15114100#comment-15114100
] 

Junping Du commented on HDFS-7694:
----------------------------------

bq. Is there compatibility concern for backporting this to 2.6 branch?
I don't think so, after checking the patch and from description above "This could be added
to the existing APIs as an optional interface." [~cmccabe], what do you think?

> 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
>
>         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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