Hi Aaron - Yes, I've read the part about changing the replication factor on a running cluster. I've even done it without a problem. My real point of my question was ....
> do you now have unused replica data on the "old" replica nodes that you need > to clean up manually? any insight would be appreciated. On Apr 1, 2011, at 1:45 PM, aaron morton wrote: > See the section on Replication here > http://wiki.apache.org/cassandra/Operations#Replication It talks about how to > change the RF and then says you can do the same when change the placement > strategy. > > It can be done, but is a little messy. > > Depending on your setup it may also be possible to copy / move the nodes > manually by moving sstable files. > > I've not done it myself, are you able to run a test ? > > Hope that helps. > Aaron > > On 1 Apr 2011, at 02:04, Jonathan Colby wrote: > >> >> 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? >
