G1 can rely on `-XX:G1NewSizePercent=50` to always floor the young generation's size to 50% of the heap. (In production this can be raised to 66% for optimal performance.)
Fixing the young generation size with `-Xmn` is only applicable to CMS, so move it to the appropriate section.
When using G1, we can automatically set `-XX:ParallelGCThreads` and `-XX:ConcGCThreads` to the number of system cpu cores.
The auto-generated heap size is now half the server's physical RAM, capped at 16G for CMS and 31G for G1.
Increase MaxTenuringThreshold from 1 to 2, as evidence has shown it has no cost (over values of zero or one), but can have significant benefits in keeping objects in the young generation. While, values above 2 don't have any noticeable benefit.
Always set CASSANDRA_HEAPDUMP_DIR, default it to $CASSANDRA_LOG_DIR, to avoid hprof filling up unexpected disk volumes. Assumption here is that the logs directory is large enough to handle these dumps, and/or operators are monitoring these directories more than other randon/unknown directories.
patch by Mick Semb Wever; reviewed by Jon Haddad for CASSANDRA-20296
- Add Bouncycastle dependency
- Upgrade tcnative boringssl
- Add TLSv1.3 to encryption options tests
- Revert defaults after changes in Netty 4.1.75
- Remove Guava 18 from deps - we accidentally ended with Guava 30+ and 18 on the classpath because JimFS includes it as a transient dependency.
Patch by Jacek Lewandowski and Brandon Williams; reviewed by Ekaterina Dimitrova and Berenguer Blasi for CASSANDRA-17992
Co-authored-by: Jacek Lewandowski <lewandowski.jacek@gmail.com>
Co-authored-by: Brandon Williams <driftx@gmail.com>
Some transitive dependencies to these have also been added to raise their versions. asm-* transitive dependencies have been excluded.
patch by Mick Semb Wever; reviewed by Ekaterina Dimitrova for CASSANDRA-18049
mck