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Date: Wed, 15 Aug 2012 11:11:38 +1100 (NCT)
From: "Alejandro Abdelnur (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-7754) Expose file descriptors from
 Hadoop-wrapped local FileSystems
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    [ https://issues.apache.org/jira/browse/HADOOP-7754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434681#comment-13434681 ] 

Alejandro Abdelnur commented on HADOOP-7754:
--------------------------------------------

Ahmed, jenkins precommit job picks up the last file you upload, you uploaded the report of your local run, jenkins tried to apply that as patch and it failed. please re-upload, only, your trunk patch.
                
> 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, performance
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-7754-0.23.0-hasfd.txt, HADOOP-7754_branch-1_rev2.patch, HADOOP-7754_branch-1_rev3.patch, HADOOP-7754_branch-1_rev4.patch, HADOOP-7754_trunk.patch, HADOOP-7754_trunk_rev2.patch, HADOOP-7754_trunk_rev2.patch, HADOOP-7754_trunk_rev3.patch, HADOOP-7754_trunk_rev4.patch, HADOOP-7754_trunk_rev4.patch, hasfd.txt, test-patch-hadoop-7754.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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