No. This is not going to work. The vnodes feature requires the murmur3 partitioner which was introduced with Cassandra 1.2.
Since you are currently using 1.1, you must be using the random partitioner, which is not compatible with vnodes. Because the partitioner determines the physical layout of all of your data on disk and across the cluster, it is not possible to change partitioner without taking some downtime to rewrite all of your data. You should probably plan on an upgrade to 1.2 but without also switching to vnodes at this point. -Tupshin On Dec 30, 2013 9:46 AM, "Katriel Traum" <katr...@google.com> wrote: > Hello list, > > I have a 2 DC set up with DC1:3, DC2:3 replication factor. DC1 has 6 > nodes, DC2 has 3. This whole setup runs on AWS, running cassandra 1.1. > Here's my nodetool ring: > 1.1.1.1 eu-west 1a Up Normal 55.07 GB 50.00% > 0 > 2.2.2.1 us-east 1b Up Normal 107.82 GB 100.00% > 1 > 1.1.1.2 eu-west 1b Up Normal 53.98 GB 50.00% > 28356863910078205288614550619314017622 > 1.1.1.3 eu-west 1c Up Normal 54.85 GB 50.00% > 56713727820156410577229101238628035242 > 2.2.2.2 us-east 1d Up Normal 107.25 GB 100.00% > 56713727820156410577229101238628035243 > 1.1.1.4 eu-west 1a Up Normal 54.99 GB 50.00% > 85070591730234615865843651857942052863 > 1.1.1.5 eu-west 1b Up Normal 55.1 GB 50.00% > 113427455640312821154458202477256070484 > 2.2.2.3 us-east 1e Up Normal 106.78 GB 100.00% > 113427455640312821154458202477256070485 > 1.1.1.6 eu-west 1c Up Normal 55.01 GB 50.00% > 141784319550391026443072753096570088105 > > > I am going to upgrade my machine type, upgrade to 1.2 and change the > 6-node to 3 nodes. I will have to do it on the live system. > I'd appreciate any comments about my plan. > 1. Decommission a 1.1 node. > 2. Bootstrap a new one in-place, cassandra 1.2, vnodes enabled (I am > trying to avoid a re-balance later on). > 3. When done, decommission nodes 4-6 at DC1 > > Issues i've spotted: > 1. I'm guessing I will have an unbalanced cluster for the time period > where I have 1.2+vnodes and 1.1 mixed. > 2. Rollback is cumbersome, snapshots won't help here. > > Any feedback appreciated > > Katriel > >
