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https://issues.apache.org/jira/browse/HADOOP-10410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939738#comment-13939738
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Andrew Wang commented on HADOOP-10410:
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Out of curiosity, have you done any benchmarking with ioprio_set? I actually
tried this a while ago and found that the default queue depth on the disk
controller was too deep to get much latency improvement, you might skip the
queues in the block layer, but then you're still sitting behind 32 or 64
requests on the disk. It works if you reduce the disk queue size, but that
leads to a throughput hit.
> 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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