[jira] Commented: (CASSANDRA-1155) keep persistent row statistics

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-1155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874963#action_12874963 ] 

Jonathan Ellis commented on CASSANDRA-1155:
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this metadata needs to be persisted (as a Meta file to go with Data Index and Filter), too.

> 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
>             Fix For: 0.7
>
>
> 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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