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Jonathan Ellis commented on CASSANDRA-4756:
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Well, let me give a trivial example addressing both of those.
Suppose I have 3 nodes, A C D, and RF=2. Row 1 is replicated to A and C. We
add node B, then bulk load snapshots with my scheme.
The snapshot of A with --one-copy=0 would send that row to A. The snapshot of
C with --one-copy=1 would send that row to B.
> 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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