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https://issues.apache.org/jira/browse/CASSANDRA-5972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-5972:
----------------------------------------
    Component/s: Repair

> Reduce the amount of data to be transferred during repair
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-5972
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5972
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Repair
>            Reporter: Jacek Lewandowski
>            Priority: Minor
>
> Currently, when a validator finds a token range different in n replicas, data 
> streams are initiated simultaneously between each possible pair of these n 
> nodes, in both directions. It yields n*(n-1) data stream in total. 
> It can be done in a sequence - Replica[1] -> R[2], R[2] -> R[3], ... , R[n-1] 
> -> R[n]. After this process, the data in R[n] are up to date. Then, we 
> continue: R[n] -> R[1], R[1] -> R[2], ... , R[n-2] -> R[n-1]. The active 
> repair is done after 2*(n-1) data transfers performed sequentially in 2*(n-1) 
> steps.



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