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https://issues.apache.org/jira/browse/HDFS-14406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822257#comment-16822257
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Erik Krogen commented on HDFS-14406:
------------------------------------

I don't have time to take a full look at the patch today, but will give my 2c 
on this question:
{quote}
Kept this per user per user per method metrics. What do you guys think of this 
idea?
{quote}
I don't think per-user per-method metrics are a good idea. In my current 
system, just wading through the overall system list of per-method metrics is a 
daunting task. For installations with large user counts (100s or 1000s) this 
will make these metrics completely unusable due to their huge volume.

> Add per user RPC Processing time
> --------------------------------
>
>                 Key: HDFS-14406
>                 URL: https://issues.apache.org/jira/browse/HDFS-14406
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.2.0
>            Reporter: Xue Liu
>            Assignee: Xue Liu
>            Priority: Minor
>             Fix For: 3.2.0
>
>         Attachments: HDFS-14406.001.patch, HDFS-14406.002.patch, 
> HDFS-14406.003.patch, HDFS-14406.004.patch, HDFS-14406.005.patch, 
> HDFS-14406.006.patch
>
>
> For a shared cluster we would want to separate users' resources, as well as 
> having our metrics reflecting on the usage, latency, etc, for each user. 
> This JIRA aims to add per user RPC processing time metrics and expose it via 
> JMX.



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