[jira] [Commented] (HBASE-14869) Better request latency and size histograms

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-14869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15047891#comment-15047891 ] 

Lars Hofhansl commented on HBASE-14869:
---------------------------------------

Committed to the world. (Every branch needed a slight change - just committing is a pain in the ass now, took over 90 minutes)

> Better request latency and size histograms
> ------------------------------------------
>
>                 Key: HBASE-14869
>                 URL: https://issues.apache.org/jira/browse/HBASE-14869
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>            Assignee: Vikas Vishwakarma
>             Fix For: 2.0.0, 1.3.0, 0.98.17
>
>         Attachments: 14869-test-0.98.txt, 14869-v1-0.98.txt, 14869-v1-2.0.txt, 14869-v2-0.98.txt, 14869-v2-2.0.txt, 14869-v3-0.98.txt, 14869-v4-0.98.txt, 14869-v5-0.98.txt, 14869-v6-0.98.txt, AppendSizeTime.png, Get.png
>
>
> I just discussed this with a colleague.
> The get, put, etc, histograms that each region server keeps are somewhat useless (depending on what you want to achieve of course), as they are aggregated and calculated by each region server.
> It would be better to record the number of requests in certainly latency bands in addition to what we do now.
> For example the number of gets that took 0-5ms, 6-10ms, 10-20ms, 20-50ms, 50-100ms, 100-1000ms, > 1000ms, etc. (just as an example, should be configurable).
> That way we can do further calculations after the fact, and answer questions like: How often did we miss our SLA? Percentage of requests that missed an SLA, etc.
> Comments?



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