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Posted to common-issues@hadoop.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2014/04/19 23:19:17 UTC

[jira] [Commented] (HADOOP-10410) Support ioprio_set in NativeIO

    [ https://issues.apache.org/jira/browse/HADOOP-10410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974972#comment-13974972 ] 

Andrew Purtell commented on HADOOP-10410:
-----------------------------------------

bq. Doing our own IO scheduling, however, is a much larger project, which to be effective may also require other deep changes like switching to O_DIRECT

Sooner or later, a database or database-ish system usually ends up at O_DIRECT

> 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
>         Attachments: HADOOP-10410.txt
>
>
> 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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