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From Jonathan Colby <>
Subject changing replication strategy and effects on replica nodes
Date Thu, 31 Mar 2011 15:04:20 GMT

From my understanding of replica copies,  cassandra picks which nodes to replicate the data
based on replication strategy, and those same "replica partner" nodes are always used according
to token ring distribution.

If you change the replication strategy,  does cassandra pick new nodes to replicate to?  
(for example if you went from simple strategy to a networkTopology strategy where copies are
to be sent to another datacenter)

If so,  do you now have unused replica data on the "old" replica nodes that you need to clean
up manually?
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