I think 3.11 supported upgrade from 2.2, but I haven’t checked. I am fairly sure 4.x supported upgrade from 3.0.x also.
> On 11 Dec 2024, at 12:53, Miklosovic, Stefan via dev > <dev@cassandra.apache.org> wrote: > > I see. That makes sense. I think that by 3.x you meant basically the latest > 3.11, right? I guess 2.2 -> 3.0 already works, we would just try to support > 2.2 -> 3.11 straight away. I need to check where we are at in that area. > > ________________________________________ > From: Benedict <bened...@apache.org> > Sent: Wednesday, December 11, 2024 13:09 > To: dev@cassandra.apache.org > Cc: Miklosovic, Stefan; dev@cassandra.apache.org; Miklosovic, Stefan > Subject: Re: Supporting 2.2 -> 5.0 upgrades > > EXTERNAL EMAIL - USE CAUTION when clicking links or attachments > > > > > 2.2 is particularly hard because of the major storage format changes that > took place. > > I think if we want to retain (restore) upgrade support from 3.x I would > support that, but 2.x is probably too burdensome and likely to have too many > hard edges. > > I think if users only had to upgrade 2.2->3.x then eg 3.x->6.0 that would be > a pretty friendly upgrade path all things considered. > >> On 11 Dec 2024, at 12:03, Miklosovic, Stefan via dev >> <dev@cassandra.apache.org> wrote: >> >> Hey, >> >> I want to fork the thread where we are mentioning that 2.2 -> 5.0 would be >> cool to support. >> >> I was involved in checking that offline upgrades from 3.0 to 5.0 work and >> fixed few issues along the way (1), hence I can imagine that supporting 2.2 >> -> 5.0 would be basically the same thing just on steroids and more involved? >> Anyway, having a stab into this is not useless at all, I will at least go >> deep into the upgrade stuff I have never given a lot of thought to which is >> good learning experience. >> >> Any tips where to start? Was any progress done by anybody already in this >> matter to not start from zero? >> >> (1) >> https://urldefense.com/v3/__https://issues.apache.org/jira/browse/CASSANDRA-19002__;!!Nhn8V6BzJA!RFZoz6sQSrP_qLd0K_eNWO3UAc1s8mTT5SkFalUMwM7_l9gWfb4cnfTFvdY68zsh5-REW7T8ALTPQwqMM_gWWSyp$ >> >> Regards >
