Datastax Error : Cannot start node if snitch's data center (dc1) differs from previous data center (dc2)

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This error occurs when the node try to start and see it has snitch information which differ from previous data center. In my case, i was using DseSimpleSnitch which name the datacenter based on workload type. Previously i had enabled solr in dse default
configuration file ( /etc/default/dse ) and datasenter name was Solr. Now i tried to start the dse with graph enabled, which change the name to datacenter SearchGraph which is default workload type name.

CassandraDaemon.java:698 - Cannot start node if snitch's data center (Solr) differs from previous data center (SearchGraph). Please fix the snitch configuration, decommission and rebootstrap this node or use the flag -Dcassandra.ignore_dc=true


 Solution :

1) In the last line of cassandra-env.sh set in the jvm opts as given below :


  JVM_OPTS="$JVM_OPTS -Dcassandra.ignore_dc=true"

2) If it starts successfully, execute:

 
   nodetool repair 
   nodetool cleanup

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