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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-2609) Repair multi-DC awareness
Date Thu, 05 May 2011 10:48:03 GMT
Repair multi-DC awareness

                 Key: CASSANDRA-2609
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Sylvain Lebresne
            Priority: Minor

Repair has no multi-DC awareness in that if for instance 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 met as an exploratory ticket. 

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