It also sounds like they didn't even try #ZGC (https://wiki.openjdk.org/display/zgc/Main) since they're mentioning GC pauses as a problem and apparently their best answer to that was restarting nodes rather than configuring them to use a better GC.
Heap settings are really just tuning the same GC, not changing it.
#zgc #java #jvm #garbageCollection