I would recommend checking first for what exact metric do you have drops:
free memory or available memory. There is a common delusion about free vs
available memory in Linux: https://www.linuxatemyram.com/
Overwise if you really have spikes in *used* memory and these are spikes in
memory used by Ca
The section *"Why does top report that Cassandra is using a lot more memory
than the Java heap max?" *on the page
https://cassandra.apache.org/doc/latest/cassandra/overview/faq/index.html
can provide some useful information. I have seen Cassandra tries to take
all the available free RAM using mappe
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