Rebuilds data by streaming from other nodes.
This command operates on multiple nodes in a cluster and streams data only from a single source replica when rebuilding a token range. Use this command to add a new datacenter to an existing cluster.
But where exactly to run
nodetool rebuild ?
On each node of each existing DC (or a single time on any node of each existing DC)?
Or the opposite? ie. run
nodetool rebuildon each node of the new DC (or a single time on any node of the new DC)?