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https://issues.apache.org/jira/browse/CASSANDRA-1719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930660#action_12930660
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Jonathan Ellis commented on CASSANDRA-1719:
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bq. when I bring it up all kinds of keys are missing

isn't that just "it was the closest replica, but it didn't have the keys in 
question since it was down?"  or do you mean they don't RR?

> improve read repair
> -------------------
>
>                 Key: CASSANDRA-1719
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1719
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.6.8, 0.7.0
>
>         Attachments: 1719.txt
>
>
> Read repair recomputes the local digest for each replica, which is a lot of 
> wasted CPU on large reads

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