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
