When people have the luxury of working in environments where clusters are massively over provisioned, LCS as a default makes a lot of sense, because there's not much downside. The use cases where you'd actually fall behind in compaction are pretty slim, so the negative impact isn't felt.
Most people aren't doing this. Putting LCS as the default significantly changes the performance profile of new clusters in a way that actively harms a portion of the community. Let me be clear - I am not a fan of STCS, but at least it's a C rating across a variety of workloads. LCS while works better for a majority of workloads, works incredibly poorly for others. I'd rather have mediocre defaults for everyone than a ticking time bomb for a meaningful percentage of the community. We also, as others have said, should move to UCS as the default in the long term, so temporarily switching to LCS now seems pointless. The main grievances over UCS all seem to be doc related, and a lack of experience. These are both fixable problems. Jon On Sat, Dec 7, 2024 at 9:48 AM Jordan West <jorda...@gmail.com> wrote: > Generally agree with the following sentiments: > > - LCS as the stable default, it’s not perfect and can blow up but it’s the > best in the majority of cases. All of the compaction strategies come with > foot guns of varying sizes. If STCS is replaced by UCS it definitely should > not be the default. > > - moving towards UCS as the eventual default by using latest.yaml and > investing in much better docs (and UX?). I’m convinced UCS is better but I > won’t move to it until it’s better documented and understood. > > Jordan > > On Sat, Dec 7, 2024 at 04:16 Brandon Williams <dri...@gmail.com> wrote: > >> On Sat, Dec 7, 2024 at 6:05 AM Štefan Miklošovič <smikloso...@apache.org> >> wrote: >> > ouch ... that hurts ... whoever did that job. Could we be more >> emotions-less here? Branimir did an excellent job and for _technical_ >> documentation there is nothing wrong with it. It is another problem that >> the documentation is not written yet to put it in more layman terms for >> people not reading academic papers regularly. >> >> I agree with your sentiment here. It's a growing problem that we >> don't have anyone focussed on writing user docs any longer - if you >> open a ticket for docs, unfortunately you will probably need to drive >> it for it to go anywhere. >> >> Kind Regards, >> Brandon >> >
