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From "Eli Collins (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 00:40:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13411106#comment-13411106
] 

Eli Collins commented on HADOOP-7753:
-------------------------------------

In CDH we jarjar the guava jar and use/depend on that. Hadoop 1.x is already pretty broken
in this respect as webhdfs and other changes have pulled in a lot of jars which may already
be on downstream or user classpaths so it may not be worth addressing here.
                
> 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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