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Posted to commits@cassandra.apache.org by "Fabien Rousseau (JIRA)" <ji...@apache.org> on 2016/06/18 21:14:05 UTC

[jira] [Updated] (CASSANDRA-12015) Rebuilding from another DC should use different sources

     [ https://issues.apache.org/jira/browse/CASSANDRA-12015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fabien Rousseau updated CASSANDRA-12015:
----------------------------------------
    Attachment: 12015-2.1.patch

> 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
>         Attachments: 12015-2.1.patch
>
>
> 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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