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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7694) FSDataInputStream should support "unbuffer"
Date Wed, 11 Feb 2015 01:13:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315334#comment-14315334
] 

Yi Liu commented on HDFS-7694:
------------------------------

The latest patch looks good to me, thanks Colin. One comment: 
could we verify that we still read successfully and verify the read content is correct after
we do {{unbuffer}}?


> 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
>         Attachments: HDFS-7694.001.patch, HDFS-7694.002.patch, HDFS-7694.003.patch, HDFS-7694.004.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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