cassandra bitnmami chart enable G1GC garbade collection instead of default CMS

[jalsanishant]

Name and Version

bitnami/cassandra 10.6.6

What is the problem this feature will solve?

improves the efficiency of ram management, clears unused space, enables faster processing of tables

What is the feature you are proposing to solve the problem?

need an option for enabling G1GC on all replicas of Cassandra pods inside values of helm chart - https://github.com/bitnami/charts/blob/main/bitnami/cassandra/values.yaml instead of manually changing config at /opt/bitnami/cassandra/conf/jvm11-server.options file on a pod which is not ideal

What alternatives have you considered?

manual change requires commenting of CMS settings & uncommenting G1GC settings inside jvm11-server.options file:

#################
# GC SETTINGS #
#################

### CMS Settings
-XX:+UseConcMarkSweepGC
-XX:+CMSParallelRemarkEnabled
-XX:SurvivorRatio=8
-XX:MaxTenuringThreshold=1
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly
-XX:CMSWaitDuration=10000
-XX:+CMSParallelInitialMarkEnabled
-XX:+CMSEdenChunksRecordAlways
## some JVMs will fill up their heap when accessed via JMX, see CASSANDRA-6541
-XX:+CMSClassUnloadingEnabled

### G1 Settings
## Use the Hotspot garbage-first collector.
#-XX:+UseG1GC
#-XX:+ParallelRefProcEnabled

#
## Have the JVM do less remembered set work during STW, instead
## preferring concurrent GC. Reduces p99.9 latency.
#-XX:G1RSetUpdatingPauseTimePercent=5
#
## Main G1GC tunable: lowering the pause target will lower throughput and vise versa.
## 200ms is the JVM default and lowest viable setting
## 1000ms increases throughput. Keep it smaller than the timeouts in cassandra.yaml.
#-XX:MaxGCPauseMillis=500

## Optional G1 Settings
# Save CPU time on large (>= 16GB) heaps by delaying region scanning
# until the heap is 70% full. The default in Hotspot 8u40 is 40%.
#-XX:InitiatingHeapOccupancyPercent=70

# For systems with > 8 cores, the default ParallelGCThreads is 5/8 the number of logical cores.
# Otherwise equal to the number of cores when 8 or less.
# Machines with > 10 cores should try setting these to <= full cores.
#-XX:ParallelGCThreads=16
# By default, ConcGCThreads is 1/4 of ParallelGCThreads.
# Setting both to the same value can reduce STW durations.
#-XX:ConcGCThreads=16

--> checkout https://github.com/k8ssandra/k8ssandra/blob/140cf8d5960e6fd2b4265817e5a7fdb177a7559d/charts/k8ssandra/values.yaml#L228

[carrodher]

Thank you for bringing this issue to our attention. We appreciate your involvement! If you're interested in contributing a solution, we welcome you to create a pull request. The Bitnami team is excited to review your submission and offer feedback. You can find the contributing guidelines here.

Your contribution will greatly benefit the community. Feel free to reach out if you have any questions or need assistance.

[github-actions[bot]]

This Issue has been automatically marked as "stale" because it has not had recent activity (for 15 days). It will be closed if no further activity occurs. Thanks for the feedback.

[github-actions[bot]]

Due to the lack of activity in the last 5 days since it was marked as "stale", we proceed to close this Issue. Do not hesitate to reopen it later if necessary.