I have a Cassandra cluster with 2 datacenters of 3 nodes each - DC1 and DC2.
During disaster test, network will be down between DC1 and DC2, and application will connect to DC2.
Do we need shutdown cassandra service in DC1 during the test, then bring it back and run nodetool repair one by one after the test? OR no shutdown, just run nodetool repair on all nodes after the test?
Once network recovered, before data fully synced from DC2 to DC1, if application use Consistency Level = one, will it get outdated data from DC1?