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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14869) Better request latency histograms
Date Sun, 22 Nov 2015 17:01:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15021078#comment-15021078
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Lars Hofhansl commented on HBASE-14869:
---------------------------------------

I think we have histograms for all these (put time, get time, call time, etc), but the call
time does not tell which operation happened.
A first step could just be adding the latency bands to our histograms.


> Better request latency histograms
> ---------------------------------
>
>                 Key: HBASE-14869
>                 URL: https://issues.apache.org/jira/browse/HBASE-14869
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>
> 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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