Strangely enough, even though CPU might be considered the most important computing resource, RAM allocation for clustered services is even more important due to the fact that RAM overuse can (and will) cause Out of Memory (OOM) process and task failures for anything running on the same host. With the prevalence of memory leaks in software, this usually is not a matter of "if" but "when", so setting limits for RAM allocation is generally very desirable, and in some orchestration configurations it is even mandatory. Suffering from this issue is usually indicated by seeing SIGKILL, "Process killed", or exit code -9 on your service.
Keep in mind, though, that these signals could very well be caused by other things but the most common ...
