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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-2232) Clean up and document EstimatedHistogram
Date Mon, 28 Feb 2011 07:01:36 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-2232:
--------------------------------------

    Remaining Estimate: 2h
     Original Estimate: 2h

> Clean up and document EstimatedHistogram
> ----------------------------------------
>
>                 Key: CASSANDRA-2232
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2232
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.7.3
>
>         Attachments: 2232.txt
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> EstimatedHistogram treats adding value n as adding a value infinitesimally greater than
n.  This barely made sense for the original goal of latency tracking but is clearly broken
for inherently integral data like sstables-per-read.
> Also, median() is broken, but even a non-broken median() would not be correct to use
in mean row size reporting which is its only caller.

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