The default garbage collector in Java 11 is G1*. *It's designed to be self-tuning, so I'd call it friendly. We have run Java 8 and 11 on G1 in production on all of our 1,000+ clusters for several years.
I'd agree with Jeremiah that it's worth changing in trunk at the very least and consider backporting. On Wed, Nov 9, 2022 at 5:10 PM Brandon Williams <dri...@gmail.com> wrote: > If CMS is gone, is there a friendlier alternative to G1? > > On Wed, Nov 9, 2022 at 3:53 PM Josh McKenzie <jmcken...@apache.org> wrote: > > > > 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. > > > > >
