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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10410) Support ioprio_set in NativeIO
Date Tue, 18 Mar 2014 20:37:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939742#comment-13939742
] 

Andrew Wang commented on HADOOP-10410:
--------------------------------------

It might also be worth playing with the deadline scheduler rather than CFQ, though clearly
that wouldn't provide differentiated service. IIRC ioprio only does something with CFQ too.

> Support ioprio_set in NativeIO
> ------------------------------
>
>                 Key: HADOOP-10410
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10410
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: native
>    Affects Versions: 3.0.0, 2.4.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>
> It would be better to HBase application if HDFS layer provide a fine-grained IO request
priority. Most of modern kernel should support ioprio_set system call now.



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