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From "Ahmed Radwan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7754) Expose file descriptors from Hadoop-wrapped local FileSystems
Date Mon, 06 Aug 2012 08:50:03 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429032#comment-13429032
] 

Ahmed Radwan commented on HADOOP-7754:
--------------------------------------

Here is an updated patch that applies cleanly to trunk.
                
> Expose file descriptors from Hadoop-wrapped local FileSystems
> -------------------------------------------------------------
>
>                 Key: HADOOP-7754
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7754
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: native
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: HADOOP-7754_trunk.patch, hadoop-7754-0.23.0-hasfd.txt, hasfd.txt
>
>
> In HADOOP-7714, we determined that using fadvise inside of the MapReduce shuffle can
yield very good performance improvements. But many parts of the shuffle are FileSystem-agnostic
and thus operate on FSDataInputStreams and RawLocalFileSystems. This JIRA is to figure out
how to allow RawLocalFileSystem to expose its FileDescriptor object without unnecessarily
polluting the public APIs.

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