How about option 1? Any issues with option 1? On Wed, May 19, 2021, 6:58 PM Kane Wilson <k...@raft.so> wrote:
> On Thu, May 20, 2021 at 11:17 AM Jai Bheemsen Rao Dhanwada < > jaibheem...@gmail.com> wrote: > >> Thanks for the response, >> >> Is there a limit on how long I can run in mixed mode? Let's say if >> datacenter 1 is upgraded and upgradesstables was run on day 1 and >> datacenter 3 is upgraded and upgradesstables runs on day 10. Is that going >> to be a big concern? >> > There is no "limit". The major caveat is a lack of ability to run repair, > which may or may not be a problem in your scenario. > > >> > 2 might be strictly safer if you trust internode mixed mode AND have a >> way to fail out of a dc and rebuild it without violating consistency. >> I tested the mixed mode and it works, but are there any catches that >> won't work? >> >> I am okay to disable repair during this time. >> > I'd still advise limiting time in mixed mode. You probably don't want to > be stuck doing operations in mixed mode, or without repair for too long. An > alternative would be to just upgrade one node in each DC first, and monitor > that node for any issues. If that node seems stable enough you can roll out > to the whole DC, whereas if it encounters problems you can downgrade/fix it > without having to go through a complex DC failover. You could even do this > in parallel across all your DC's, and thus limit the time you're in mixed > mode substantially. > > -- > raft.so - Cassandra consulting, support, and managed services >
