Thanks for the suggestions. Few more questions on the mixed mode. Can I perform the below operations on my cluster in the mixed mode?
1. Add a new datacenter with the new version 2. Remove a datacenter 3. Add more nodes to the upgraded or non-upgraded datacenter 4. Schema changes I haven't tested these yet, but just trying to gather information about do's and don'ts On Wed, May 19, 2021 at 7:39 PM Jeff Jirsa <jji...@gmail.com> wrote: > Incredibly slow and has no real benefits beyond a single canary. > > > On May 19, 2021, at 7:19 PM, rammohan ganapavarapu < > rammohanga...@gmail.com> wrote: > > > 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 >> >
