Since the cluster name is only cosmetic people do not often change it. I would not do this in a production cluster for sure.
On Thu, Nov 29, 2012 at 2:56 PM, Wei Zhu <wz1...@yahoo.com> wrote: > 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 <http://wiki.apache.org/cassandra/LocationInfo> > > [utf8('L')][utf8('ClusterName<http://wiki.apache.org/cassandra/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 >
