[FOLLOW UP QUESTION TO #8948]
Before decomm on-prim DC should repair be run all on on-prim DC nodes including newly built AWS DC or required to run repair only on new AWS DC nodes one at a time ?
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Erick Ramirez for the following reason: The question is answered, right answer was accepted
Should we run repair on all nodes after adding a new DC or just on nodes in the new DC?
The general recommendation is to regularly run repairs against your cluster regardless of topology changes. If you know that replicas are not consistent or you haven't been running repairs regularly, repair the existing nodes in the cluster before adding a new DC.
Running repair on the newly added nodes is not necessary immediately after they were added because they should be consistent with other replicas provided you followed the general recommendation above.
The standard procedure before decommissioning a DC is to run a full repair to make sure that replicas in all DCs are consistent before the DC is removed. For details, see Decommissioning a datacenter. Cheers!
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