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Date: Thu, 27 Oct 2011 05:25:32 +0000 (UTC)
From: "Kihwal Lee (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HADOOP-7753) Support fadvise and
 sync_data_range in NativeIO, add ReadaheadPool class
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    [ https://issues.apache.org/jira/browse/HADOOP-7753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13136785#comment-13136785 ] 

Kihwal Lee commented on HADOOP-7753:
------------------------------------

It is a custom macro so autoconf didn't automatically took care of everything. I think HAVE_SYNC_FILE_RANGE has to be checked and _GNU_SOURCE needs to be set before including fcntl.h.
                
> Support fadvise and sync_data_range in NativeIO, add ReadaheadPool class
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-7753
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7753
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: io, native
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-7753.txt, hadoop-7753.txt, hadoop-7753.txt, hadoop-7753.txt
>
>
> This JIRA adds JNI wrappers for sync_data_range and posix_fadvise. It also implements a ReadaheadPool class for future use from HDFS and MapReduce.

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