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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Resolved] (CASSANDRA-2609) Repair multi-DC awareness
Date Fri, 20 Sep 2013 20:34:52 GMT


Jonathan Ellis resolved CASSANDRA-2609.

    Resolution: Won't Fix
> Repair multi-DC awareness
> -------------------------
>                 Key: CASSANDRA-2609
>                 URL:
>             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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