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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1024) Latency Histograms
Date Mon, 26 Apr 2010 23:47:32 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861172#action_12861172
] 

Jonathan Ellis commented on CASSANDRA-1024:
-------------------------------------------

I'd like to see that too.  (I wrote some naive code for something like this before but it
was too expensive in CPU used and garbage generated.)

> Latency Histograms
> ------------------
>
>                 Key: CASSANDRA-1024
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1024
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Ryan King
>
> In addition to total and recent latency, I would like to keep track of histograms. We
have a way for doing estimated histograms (whose error domain gets worse the higher the latency
and whose storage requirements are constant). It works pretty well for us:
>   http://github.com/robey/ostrich/blob/master/src/main/scala/com/twitter/ostrich/Histogram.scala
> I'm planning on doing the work, but wanted to know if it would be useful to others.

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