Hi I changed running cluster endpoint_snitch value SimpleSnitch to GossipingPropertyFileSnitch and tried restarting the cluster but am getting with below error and cluster is down.
ERROR [main] 2022-06-21 12:43:22,219 CassandraDaemon.java:911 - Cannot start node if snitch's data center (dc1) differs from previous data center (datacenter1). Please fix the snitch configuration, decommission and rebootstrap this node or use the flag -Dcassandra.ignore_dc=true.
As the error states, you cannot change the data centre name of nodes once they have joined the cluster. In your case, you've changed them from datecenter1 to dc1 and it is not allowed in Cassandra since it can lead to data loss.
You will need to update cassandra-rackdc.properties on each node to switch back to the previous DC name with:
dc=datecenter1
You should be able to start Cassandra on the nodes once you've updated the DC configuration. Cheers!
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