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https://issues.apache.org/jira/browse/CASSANDRA-1155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892766#action_12892766
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Hudson commented on CASSANDRA-1155:
-----------------------------------
Integrated in Cassandra #501 (See
[http://hudson.zones.apache.org/hudson/job/Cassandra/501/])
> keep persistent row statistics
> ------------------------------
>
> Key: CASSANDRA-1155
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1155
> Project: Cassandra
> Issue Type: Sub-task
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Brandon Williams
> Fix For: 0.7 beta 1
>
> Attachments: 1155-v2.txt, 1155-v3.txt, 1155-v4.txt, 1155-v5.txt,
> 1155.txt
>
>
> during flush and compaction we should keep row size statistics using
> EstimatedHistogram (column count, and row size), replacing min/max/total
> sizes in CFS.
> having this detail will let us estimate, given an index CF, how many nodes we
> need to query to get the number of matching rows requested by the client.
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