In order to speed up the conversion to the multi-instance setup & finish the cluster expansion, it would be useful to bootstrap nodes in different DCs in parallel. I asked the cassandra-users mailing list about this, and the reply suggests that this should indeed work:
So, I am proposing to try the following on the staging cluster:
- start a bootstrap of another instance on one of the eqiad nodes, and
- while that is running, bootstrap another instance in codfw.