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https://issues.apache.org/jira/browse/HADOOP-17165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17176082#comment-17176082
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Takanobu Asanuma commented on HADOOP-17165:
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Thanks for your comment, [~csun]. I will create PR and address your comment
later.
I did some tests for our workload using Dynamometer with or without this patch.
I uploaded the graph of the queue length.
In the test, the queue size is two, high priority and low priority, and the
weight ratio is 9:1. Our important service-user submitted jobs heavily in the
time range. From the before graph, the RPCs of the service-user are stacked
into the low priority queue. From the after graph (applied this patch), you can
see they are into the high priority queue. Of course, the service-user command
latency is faster with this patch.
> Implement service-user feature in DecayRPCScheduler
> ---------------------------------------------------
>
> Key: HADOOP-17165
> URL: https://issues.apache.org/jira/browse/HADOOP-17165
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Takanobu Asanuma
> Assignee: Takanobu Asanuma
> Priority: Major
> Attachments: HADOOP-17165.001.patch, HADOOP-17165.002.patch,
> after.png, before.png
>
>
> In our cluster, we want to use FairCallQueue to limit heavy users, but not
> want to restrict certain users who are submitting important requests. This
> jira proposes to implement the service-user feature that the user is always
> scheduled high-priority queue.
> According to HADOOP-9640, the initial concept of FCQ has this feature, but
> not implemented finally.
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