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From Wei Zhu <wz1...@yahoo.com>
Subject Rename cluster
Date Thu, 29 Nov 2012 19:56:28 GMT
Hi,
I am trying to rename a cluster by following the instruction on Wiki:

Cassandra says "ClusterName mismatch: oldClusterName != newClusterName" and refuses to start
To prevent 
operator errors, Cassandra stores the name of the cluster in its system 
table.  If you need to rename a cluster for some reason, you can: 
Perform these steps on each node: 
	1. Start the cassandra-cli connected locally to this node. 
	2. Run the following: 
	1. use system; 
	2. set LocationInfo[utf8('L')][utf8('ClusterName')]=utf8('<new cluster name>'); 
	3. exit; 
	3. Run nodetool flush on this node. 
	4. Update the cassandra.yaml file for the cluster_name as the same as 2b). 
	5. Restart the node. 
Once all nodes have been had this operation performed and restarted, nodetool ring should
show all nodes as UP.

Get the following error:
Connected to: "Test Cluster" on 10.200.128.151/9160
Welcome to Cassandra CLI version 1.1.6

Type 'help;' or '?' for help.
Type 'quit;' or 'exit;' to quit.

[default@unknown] use system;
Authenticated to keyspace: system
[default@system] set LocationInfo[utf8('L')][utf8('ClusterName')]=utf8('<General Services
Cluster>'); 
system keyspace is not user-modifiable.
InvalidRequestException(why:system keyspace is not user-modifiable.)
at org.apache.cassandra.thrift.Cassandra$insert_result.read(Cassandra.java:15974)
at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
at org.apache.cassandra.thrift.Cassandra$Client.recv_insert(Cassandra.java:797)
at org.apache.cassandra.thrift.Cassandra$Client.insert(Cassandra.java:781)
at org.apache.cassandra.cli.CliClient.executeSet(CliClient.java:909)
at org.apache.cassandra.cli.CliClient.executeCLIStatement(CliClient.java:222)
at org.apache.cassandra.cli.CliMain.processStatementInteractive(CliMain.java:219)
at org.apache.cassandra.cli.CliMain.main(CliMain.java:346)

I have to remove the data directory in order to change the cluster name. Luckily it's my testing
box, so no harm. Just wondering what has been changed not to allow the modification through
cli? What is the way of changing the cluster name without wiping out all the data now?

Thanks.
-Wei 
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