Stick with 31G in your case. Another article on compressed Oops:


From: Eunsu Kim []
Sent: Dienstag, 13. Februar 2018 08:09
Subject: if the heap size exceeds 32GB..

According to the article above, if the heap size of the JVM is about 32GB, it 
is a waste of memory because it can not use the compress object pointer. (Of 
course talking about ES)

But if this is a general theory about the JVM, does that apply to Cassandra as 

I am using a 64 GB physical memory server and I am concerned about heap size 

Thank you.
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