Hi, We did it once and it worked well. Those two links should help (this is more or less what we've done) : http://www.datastax.com/documentation/cassandra/1.2/webhelp/cassandra/operations/ops_add_dc_to_cluster_t.html http://www.datastax.com/documentation/cassandra/1.2/webhelp/cassandra/operations/ops_decomission_dc_t.html
2013/12/12 Andrew Cooper <andrew.coo...@nisc.coop> > Hello, > > We are in the process of isolating multiple applications currently running > in one large cassandra cluster to individual smaller clusters. Each > application runs in its own keyspace. In order to reduce/eliminate > downtime for a migration, I was curious if anyone had attempted the > following process to migrate data to a new cluster: > > 1) Add new cluster nodes as a new datacenter to existing cluster > 2) Set RF for specific keyspace to non-zero for new cluster, use nodetool > rebuild on new nodes to stream data > 3) Change application node connections to point to new cluster > 4) Set RF to 0 for original cluster (stop new writes from going to > original cluster) > 5) Break connection between nodes so new nodes become a standalone > cluster??? <- Is this possible? what would be the high level steps? > > If this is an extremely bad or misinformed idea, I would like to know that > as well! > > I am aware of other tools available including sstableloader, etc, but this > seemed like a more elegant solution, leveraging cassandra's active-active > features. > > Thanks, > > -Andrew > NISC -- Fabien Rousseau <aur...@yakaz.com>www.yakaz.com
