Cassandra database instance exits after 10 hours of use

Document ID : KB000115802
Last Modified Date : 15/10/2018
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Introduction:
The exiting of any Cassandra microservice is not normal. 
Question:
Support, I have the Sysview MTC zLinux appliance running and after being up for about 10 hours on of the cassandra database instances exits. Is this normal? 
Environment:
MAINFRAME OPERATIONAL INTELLIGENCE 2.0
Answer:
Root cause of the exited container was insufficient memory. The kernel killed the cassandra3 process due to lack of memory. This was identified in the syslogs/var/log/messages file. Sample message for searching was "Sep 20 19:32:33 SVN0_MFOI kernel: Out of memory: Kill process 5320 (java-run) score 212 or sacrifice child" 
Additional Information:
 Increasing site's installation memory from 39GB to recommended 64GB.