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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14869) Better request latency histograms
Date Mon, 30 Nov 2015 04:56:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15031322#comment-15031322
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Lars Hofhansl commented on HBASE-14869:
---------------------------------------

-v3 looks good to me. I wonder whether it's worth to make it more generic. I.e. have one class
and pass unit and ranges in? Maybe overkill.

Need a matching Hadoop1 change for 0.98 (or we can leave Hadoop1 as is, [~apurtell]?), and
a version for the master branch.
I'd also like to get input from other folks about whether there any preferences for the metrics
names ([~davelatham], [~stack], [~enis], any opinions).


> Better request latency histograms
> ---------------------------------
>
>                 Key: HBASE-14869
>                 URL: https://issues.apache.org/jira/browse/HBASE-14869
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>            Assignee: Vikas Vishwakarma
>         Attachments: 14869-test-0.98.txt, 14869-v1-0.98.txt, 14869-v2-0.98.txt, 14869-v3-0.98.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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