On Tue, Sep 29, 2015 at 9:35 AM, Dongfeng Lu <dlu66...@yahoo.com> wrote:
> Reading Richard's 6 step plan, I felt that I may just need step 1 for my > case, that is "Switch to a different snitch (possibly GPFS), and the > keyspace from SimpleStrategy to NTS but keep it all in one rack." Since I > only have 3 nodes with repliation_factor of 3 and every node has a replica > of all the data already, such a switch should be a NO-OP. Even if I assign > each node to different racks, this is still a NO-OP. Is this the correct > understanding? Do I need his steps 2 - 6? > If you have RF=N and you have repaired your cluster and have not missed any replication since, all topology changes are a NO-OP, because all data is everywhere. While I have lost thread context in my email client, you can generally treat RF=N as if it is a single node. A related operation question. When we change the snitch settings in > cassandra.yaml file, can we do it one node a time? I just wonder what would > happen if the cluster has different settings on different nodes. Maybe we > need to stop all the nodes, and apply the changes to cassandra.yaml on all > nodes, and bring them back altogether. > You can do it one at a time. =Rob
