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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3300) monitor ingest, query, etc. rates are too smooth
Date Wed, 05 Nov 2014 15:47:34 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14198540#comment-14198540
] 

Josh Elser commented on ACCUMULO-3300:
--------------------------------------

Hard to say without an actual set of changes :). I'm not against it happening for 1.6, it
just depends.

If it's just smoothing of data points by the monitor, my first thought is that 1.6 would be
fine. If we need to actually fetch data points more frequently, that's a different story.

> monitor ingest, query, etc. rates are too smooth
> ------------------------------------------------
>
>                 Key: ACCUMULO-3300
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3300
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: monitor, tserver
>            Reporter: Adam Fuchs
>             Fix For: 1.7.0
>
>         Attachments: smoothed_0.2.png, smoothed_0.95.png
>
>
> We use an exponential decay function to smooth performance monitoring. This dates back
to the early days of the project when we were taking samples frequently and everything looked
like noise. Now our performance is a bit more steady and we take samples about every 5 seconds.
I think we need to update some parameters so that finer-grained performance characteristics
show up in the monitor. This is critical for the next wave of Accumulo performance improvements.



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