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https://issues.apache.org/jira/browse/CASSANDRA-4124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13401660#comment-13401660
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Jonathan Ellis commented on CASSANDRA-4124:
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Now that we support repairing a specific range of data (CASSANDRA-3912),  you 
could expose "repair one vnode's worth of data" easily enough through nodetool, 
no changes needed on the backend.
                
> staggered repair for multiple ranges
> ------------------------------------
>
>                 Key: CASSANDRA-4124
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4124
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Sam Overton
>            Assignee: Sam Overton
>
> One difference to take into account when considering the benefit of 
> staggering repair: with the introduction of a distribution factor, replicas 
> for all ranges on one host will be spread across a larger number of other 
> hosts (DF > RF), so the impact of repair will be less with larger values of 
> DF.

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