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https://issues.apache.org/jira/browse/HADOOP-17165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17177962#comment-17177962
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Chao Sun commented on HADOOP-17165:
-----------------------------------

Sorry for the delay on my reply [~tasanuma]. The Dynamometer result looks good 
so I think we can proceed with this. Like you mentioned above, I think we still 
need something like HADOOP-15016 and we should think how this can evolve to 
that in future or don't get replaced by that. cc [~fengnanli], [~xkrogen] who 
might be interested.

Other than that, I only have some cosmetic comments on the patch:
1. can we use {{Set<String>}} as return type and field type instead of 
{{HashSet<String>}}?

Looking forward to your PR and I'll continue review there.


> 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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