All,
We have a use case where we need to change the datacenter name for a cassandra
cluster, we have a script to do this that involves a short downtime. This does
the following
1) Change replication factor for the system key spaces to be { ‘OLD_DC’ : ‘3’,
’NEW_DC”: ‘3’ }
2) Change the dc value in cassandra-rackdc.properties to NEW_DC for each node
3) Add -Dcassandra.ignore_dc=true in cassandra-env.sh for each node
4) Stop all nodes
5) Start each seed node, then start the rest of the nodes
6) change the replication factor for all the keyspaces to { ’NEW_DC”: ‘3’ }
In 3.11.x this all works fine and the cluster is good to be used again after
step 6.
However in 4.0 step 1 is now blocked by the following change "Cassandra will no
longer allow invalid keyspace replication options, such as invalid datacenter
names for NetworkTopologyStrategy”
If you skip step 1) then when the nodes come back up, you cannot login because
the system_auth keyspace still has a replication factor of ‘OLD_DC’ : ‘3’ but
there are no nodes in the dc OLD_DC so the keyspace cannot be accessed.
Is there a way around this to change the name of the datacenter?
Thanks
Paul
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