It’s worth noting there can be issues with streaming between different versions of C*. Note this excerpt from https://thelastpickle.com/blog/2019/02/26/data-center-switch.html
Note that with an upgrade it’s important to keep in mind that *streaming in a cluster running mixed versions of Casandra is not recommended* Emphasis mine. With the approach you’re suggesting streaming would be involved both during bootstrap and repair. Would it be possible to upgrade to a more recent release prior to pursuing this course of action? On Thu, Apr 16, 2020 at 1:02 AM Erick Ramirez <erick.rami...@datastax.com> wrote: > I don't mean any disrespect but let me offer you a friendly advice -- > don't do it to yourself. I think you would have a very hard time finding > someone who would recommend implementing a solution that involves mixed > versions. If you run into issues, it would be hell trying to unscramble > that egg. > > On top of that, Cassandra 3.0.9 is an ancient version released 4 years ago > (September 2016). There are several pages of fixes deployed since then. So > in the nicest possible way, what you're planning to do is not a good idea. > I personally wouldn't do it. Cheers! > -- Christopher Bradford
