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https://issues.apache.org/jira/browse/CASSANDRA-5220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654147#comment-14654147
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Jonathan Ellis commented on CASSANDRA-5220:
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Very substantial. Excited to get this in!
> Repair improvements when using vnodes
> -------------------------------------
>
> Key: CASSANDRA-5220
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5220
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.2.0 beta 1
> Reporter: Brandon Williams
> Assignee: Marcus Olsson
> Labels: performance, repair
> Attachments: 5220-yourkit.png, 5220-yourkit.tar.bz2,
> cassandra-3.0-5220-1.patch, cassandra-3.0-5220-2.patch,
> cassandra-3.0-5220.patch
>
>
> Currently when using vnodes, repair takes much longer to complete than
> without them. This appears at least in part because it's using a session per
> range and processing them sequentially. This generates a lot of log spam
> with vnodes, and while being gentler and lighter on hard disk deployments,
> ssd-based deployments would often prefer that repair be as fast as possible.
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