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https://issues.apache.org/jira/browse/CASSANDRA-3074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091038#comment-13091038
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Jonathan Ellis commented on CASSANDRA-3074:
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the proposed changes conflate the index entries themselves (always one per key) 
and the sampling rate (which is what index_interval affects).

> comments and documentation for index_interval are misleading
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-3074
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3074
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.8.4
>            Reporter: Matthew F. Dennis
>            Assignee: Matthew F. Dennis
>            Priority: Minor
>         Attachments: 3074-cassandra-0.8.patch
>
>
> The comments and documentation for index_interval are misleading.  They state 
> the larger the *sampling* the more effective the index as at the cost of 
> space.  This is true, but in the context of the configuration variable it 
> implies the larger the *setting* is the larger the index is while in fact 
> it's the opposite of that.

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