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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10410) Support ioprio_set in NativeIO
Date Wed, 19 Mar 2014 05:20:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940192#comment-13940192

Liang Xie commented on HADOOP-10410:

emmm, seems Jens' confirmation about the above ioprio.txt document is faster than i try to
learn/understand the related code: 
"Yep, the above description is still accurate - both with regards to the classes and priority
levels, as well as only CFQ supporting it"

> 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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