There is a command line utility in 1.2 to shuffle the tokens… http://www.datastax.com/dev/blog/upgrading-an-existing-cluster-to-vnodes
$ ./cassandra-shuffle --help Missing sub-command argument. Usage: shuffle [options] <sub-command> Sub-commands: create Initialize a new shuffle operation ls List pending relocations clear Clear pending relocations en[able] Enable shuffling dis[able] Disable shuffling Options: -dc, --only-dc Apply only to named DC (create only) -tp, --thrift-port Thrift port number (Default: 9160) -p, --port JMX port number (Default: 7199) -tf, --thrift-framed Enable framed transport for Thrift (Default: false) -en, --and-enable Immediately enable shuffling (create only) -H, --help Print help information -h, --host JMX hostname or IP address (Default: localhost) -th, --thrift-host Thrift hostname or IP address (Default: JMX host) Cheers ----------------- Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.com On 3/02/2013, at 11:32 PM, Manu Zhang <owenzhang1...@gmail.com> wrote: > On Sun 03 Feb 2013 05:45:56 AM CST, Daning Wang wrote: >> I'd like to upgrade from 1.1.6 to 1.2.1, one big feature in 1.2 is >> that it can have multiple tokens in one node. but there is only one >> token in 1.1.6. >> >> how can I upgrade to 1.2.1 then breaking the token to take advantage >> of this feature? I went through this doc but it does not say how to >> change the num_token >> >> http://www.datastax.com/docs/1.2/install/upgrading >> >> Is there other doc about this upgrade path? >> >> Thanks, >> >> Daning > > I think for each node you need to change the num_token option in > conf/cassandra.yaml (this only split the current range into num_token parts) > and run the bin/cassandra-shuffle command (this spread it all over the ring).
