[jira] [Created] (CASSANDRA-5997) -D option to change cluster name

["Robert Coli (JIRA)" <ji...@apache.org>]

Robert Coli created CASSANDRA-5997:
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             Summary: -D option to change cluster name
                 Key: CASSANDRA-5997
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5997
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Robert Coli
            Priority: Minor


A steady trickle of users have a need to change the name of their cluster. Perhaps they accidentally started their cluster with the wrong name and now want to change it.

http://wiki.apache.org/cassandra/FAQ#clustername_mismatch

Has the old recommendation, which was to edit the cluster name in LocationInfo and then restart.

http://comments.gmane.org/gmane.comp.db.cassandra.user/29753

Has the old workaround, which was to remove LocationInfo CF entirely.

As this info now lives in a column called "cluster_name" in a row with key "local" in a CF called "local" in the keyspace "system", one can no longer simply nuke LocationInfo. The only workaround remaining is to nuke the entire system Keyspace and re-coalesce the cluster, and then reload schema.

The community continues to need to perform this operation and we do not want to tell them to nuke or manually modify the system keyspace (though it seems they have perms again to modify..). This ticket requests a new startup -D flag "-Dcassandra.new_cluster_name" which allows one to overwrite this value at startup time. This means a rolling restart will accomplish the "rename my cluster" task, with only the cost of split-cluster for the duration.


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