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https://issues.apache.org/jira/browse/CASSANDRA-12015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15334041#comment-15334041
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Paulo Motta commented on CASSANDRA-12015:
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while picking replicas from the same DC/rack is definitely useful, I'm not sure
sorting replicas by dynamic snitch within the same rack/dc will buy us many
benefits here for bulk operation like streaming. A simple fix here would be to
use the current AbstractEndpointSnitch.sortByProximity instead, that will only
sort replicas by rack/dc, which should pick primary replicas for each range and
that should already yield a reasonable load distribution.
> Rebuilding from another DC should use different sources
> -------------------------------------------------------
>
> Key: CASSANDRA-12015
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12015
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Fabien Rousseau
>
> Currently, when adding a new DC (ex: DC2) and rebuilding it from an existing
> DC (ex: DC1), only the closest replica is used as a "source of data".
> It works but is not optimal, because in case of an RF=3 and 3 nodes cluster,
> only one node in DC1 is streaming the data to DC2.
> To build the new DC in a reasonable time, it would be better, in that case,
> to stream from multiple sources, thus distributing more evenly the load.
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