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From kurt greaves <>
Subject Re: Re[6]: Modify keyspace replication strategy and rebalance the nodes
Date Tue, 19 Sep 2017 04:59:32 GMT
So I haven't completely thought through this, so don't just go ahead and do
it. Definitely test first. Also if anyone sees something terribly wrong
don't be afraid to say.

Seeing as you're only using SimpleStrategy and it doesn't care about racks,
you could change to SimpleSnitch, or GossipingPropertyFileSnitch with just
1 rack, by changing snitch/rack details and setting

Do this for all nodes until you have 40 nodes in 1 rack, then change to NTS
with RF=3. Then do a DC migration to a new DC with the correct
configuration of racks (ideally >=3 racks).

Unfortunately DC migration is currently the only way to change RF and rack
topology without downtime.

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