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https://issues.apache.org/jira/browse/HADOOP-10410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940091#comment-13940091
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Liang Xie commented on HADOOP-10410:
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[~andrew.wang], yeh, per this doc:
https://www.kernel.org/doc/Documentation/block/ioprio.txt, seems only works
with CFQ which is the default scheduler in most of OS distributions:)
But Jens' doc was long long ago, maybe we need to have a double-check into
kernel code. And pretty thanks for sharing your finding about io request
queue, very valuable!!! For "leads to a throughput hit", i am not too worry
about it so far since at least per HBase online service requirement, the
latency issue will pop up prior against throughput in most of time.
> 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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