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https://issues.apache.org/jira/browse/HADOOP-10410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940101#comment-13940101
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Andrew Wang commented on HADOOP-10410:
--------------------------------------
Sure thing Liang, let me know how it goes :) If you're purely focused on
latency, then this is definitely worth examining. I think the deadline
scheduler might also get you the desired results without any code changes too,
and you could experiment just with fio, which is Jens' benchmarking tool.
To zero out the io queue length, do something like:
{noformat}
echo 0 | sudo tee /sys/block/sda/queue/nr_requests
{noformat}
> 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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