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