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From Jean Carlo <>
Subject Migrate from one cluster of N nodes to another cluster of M nodes where N>M
Date Fri, 13 Oct 2017 11:24:10 GMT
Hello cassandra folks.

So I want to ask how to migrate a keyspace in production to another smaller
cluster without have a downtime service.

So I was thinking that I dont want to use sstableloader and paid for the
compactions and streaming. I want actually to use the procedure when both
clusters have the same numbers of nodes so I just need to make sure to have
the same token range repartition.

However my case is not the same. I will migrate for a cluster smaller than
in production and I was thinking that I could have the same token
repartition if I combine the tokens of diferents nodes.

If I can combine the tokens of differents machines, Do you see any problems
if I combine also the sstables of the same machines from the old cluster to
the new one ?

I think to combine the tokens I can use CCM to recreate my cluster in
production and then play with removenode.

For info, my keyspace is rf 3 and I have 3 racks

Best regards

Jean Carlo

"The best way to predict the future is to invent it" Alan Kay

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