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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7753) Support fadvise and sync_data_range in NativeIO, add ReadaheadPool class
Date Wed, 11 Jul 2012 21:20:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13412008#comment-13412008
] 

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

bq. btw, which jar pulled by webhdfs into Hadoop 1.x caused problems? we should try to fix
that too.

We've seen users having trouble with jersey, which was brought in by webhdfs. For 1.x it is
already broken, like Eli said. We tend to refrain from introducing new dependencies and be
conservative on upping versions. Since users have adapted to the current broken status, changing
(add/remove/upgrade) them causes a lot of pain. :(  
                
> 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, performance
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.0
>
>         Attachments: HADOOP-7753.branch-1.patch, hadoop-7753.txt, 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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