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Date: Fri, 17 Jun 2016 13:08:05 +0000 (UTC)
From: "Paulo Motta (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-12015) Rebuilding from another DC
 should use different sources
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archived-at: Fri, 17 Jun 2016 13:08:07 -0000


    [ https://issues.apache.org/jira/browse/CASSANDRA-12015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336005#comment-15336005 ] 

Paulo Motta commented on CASSANDRA-12015:
-----------------------------------------

bq. How about just copying the sortByProximity impl from AbstractEndpointSnitch to RangeStreamer ?

you'd probably need to also copy the {{compareEndpoints}} from {{AbstractNetworkTopologySnitch}}, maybe abstract to a common static method so it can be reuse... and we'd also need to special case the {{SimpleSnitch}} case I guess. yes, definitely not a one-liner but should be feasible..

> 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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