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https://issues.apache.org/jira/browse/CASSANDRA-2609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-2609.
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Resolution: Won't Fix
> Repair multi-DC awareness
> -------------------------
>
> Key: CASSANDRA-2609
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2609
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Sylvain Lebresne
> Priority: Minor
> Labels: ponies
>
> Repair has no multi-DC awareness in that if you have 2 DC with 3 replica in
> each, a repair of a node will transit 3 merkle tree cross-DC and potentially
> initiate as many cross-DC streaming (with likely a non null intersection
> between those). In theory, we could repair separately in each DC, then repair
> between only two node cross-DC (that we know are up to date in their
> respective DC) and finally re-repair in the separate DC (to pass the cross-DC
> changes to all nodes of the DC).
> It is yet unclear to me if we can make that efficient enough that it is worth
> the added complexity, so this is really meant as an exploratory ticket.
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