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

    [ https://issues.apache.org/jira/browse/CASSANDRA-2609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773387#comment-13773387
] 

Jonathan Ellis commented on CASSANDRA-2609:
-------------------------------------------

I'm going to predict that this is unnecessary complexity once CASSANDRA-5351 and possibly
CASSANDRA-3362 are done.
                
> 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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