On Mon, Feb 19, 2018 at 10:01 AM, Kenneth Brotman < kenbrot...@yahoo.com.invalid> wrote:
> > >> Cluster wide management should be a big theme in any next major release. > >> > >Na. Stability and testing should be a big theme in the next major release. > > > > Double Na on that one Jeff. I think you have a concern there about the > need to test sufficiently to ensure the stability of the next major > release. That makes perfect sense.- for every release, especially the > major ones. Continuous improvement is not a phase of development for > example. CI should be in everything, in every phase. Stability and > testing a part of every release not just one. A major release should be a > nice step from the previous major release though. > I guess what Jeff refers to is the tick-tock release cycle experiment, which has proven to be a complete disaster by popular opinion. There's also the "materialized views" feature which failed to materialize in the end (pun intended) and had to be declared experimental retroactively. Another prominent example is incremental repair which was introduced as the default option in 2.2 and now is not recommended to use because of so many corner cases where it can fail. So again experimental as an afterthought. Not to mention that even if you are aware of the default incremental and go with full repair instead, you're still up for a sad surprise: anti-compaction will be triggered despite the "full" repair. Because anti-compaction is only disabled in case of sub-range repair (don't ask why), so you need to use something advanced like Reaper if you want to avoid that. I don't think you'll ever find this in the documentation. Honestly, for an eventually-consistent system like Cassandra anti-entropy repair is one of the most important pieces to get right. And Cassandra fails really badly on that one: the feature is not really well designed, poorly implemented and under-documented. In a summary, IMO, Cassandra is a poor implementation of some good ideas. It is a collection of hacks, not features. They sometimes play together accidentally, and rarely by design. Regards, -- Alex
