My recollection (and brief sleuthing now) surfaces: we've gone back and forth on the G1 vs. CMS debate over the years and I think we settled on "it all depends on your environment, workload, and you need to tune it anyway. It might be worth having a 'default' mode that selects one of the two based on heap size unless otherwise specified".
I certainly wouldn't make changes to any defaults on a release between beta and rc personally. On Wed, Nov 9, 2022, at 4:20 PM, Jeff Jirsa wrote: > G1 you can argue for with the changes in the JDK, though it's MUCH less > friendly to small heaps (e.g. probably our default simple user). > > Offheap memtables are different though. If someone wants to attest that > offheap_objects get the same level of rigorous testing as the existing > default, that'd be useful, but I'm pretty sure that's not true, and bugs like > https://issues.apache.org/jira/browse/CASSANDRA-12125 (which remains > undiagnosed) reinforce that it's less commonly used and may have latent > undiscovered bugs for default users. > > > > > > On Wed, Nov 9, 2022 at 11:23 AM Mick Semb Wever <m...@apache.org> wrote: >> Any objections to making these changes, at the very last minute, for 4.1-rc1 >> ? >> This is CASSANDRA-12029 and CASSANDRA-7486 >> >> Provided we figure out patches for them in the next day or two.
