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https://issues.apache.org/jira/browse/CASSANDRA-4756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472854#comment-13472854
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Nick Bailey commented on CASSANDRA-4756:
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Imagine I have a cluster of 3 nodes and RF=3. This means each node has a full
copy of the data. If I snapshot one of those nodes and then load that snapshot
using the bulkloader, it will stream a full copy of the data to all nodes. So
just bulk loading this one snapshot will create RF copies of the data. Bulk
loading a snapshot from the remaining two nodes will then repeat this process,
so 3 nodes streaming 3 copies of the data = Rf^2.
> Bulk loading snapshots creates RF^2 copies of the data
> ------------------------------------------------------
>
> Key: CASSANDRA-4756
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4756
> Project: Cassandra
> Issue Type: Improvement
> Affects Versions: 1.2.0 beta 1
> Reporter: Nick Bailey
>
> Since a cluster snapshot will contain rf copies of each piece of data,
> bulkloading all of those snapshots will create rf^2 copies of each piece of
> data.
> Not sure what the solution here is. Ideally we would merge the RF copies of
> the data before sending to the cluster. This would solve any inconsistencies
> that existed when the snapshot was taken.
> A more naive approach of only loading one of the RF copies and assuming there
> are no inconsistencies might be an easier goal for the near term though.
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