> *+1* to changing to G1 on trunk for 5.0 and 4.1.1. We have over a
> thousand clusters and over 10K nodes running on J8 and 11 with G1GC and
> memory management is excellent.
>
Thanks for the support Brad, you're definitely not alone. Alas the project
works in a consensus model, i.e. off the objections made - which have been
all sound. A good compromise has been offered that I will move forward on,
and I'll also update the commented out G1 settings in 4.1.1 to match those
becoming the default in trunk.
> Excellent. Two observations: first we reverted MaxGCPauseMillis=200,
> which is the JVM default. Cassandra's jvm{8,11}-server.options has 500
> (commented out) for some reason. Second on some clusters with 'humongous
> allocations' we've had to increase G1HeapRegionSize in a few cases on
> clusters with very large partitions.
>
> CMS was deprecated in Java 9, so I don't know why Cassandra would still
> use it as the default.
>
Absolutely! Take a look at the patch, it aligns the G1 settings closer to
what you say.
https://github.com/apache/cassandra/compare/trunk...thelastpickle:cassandra:mck/7486/trunk
My apologies I did not create this ticket earlier.
