如何区分logstash中的RAM和堆使用情况？

Question

I am running a logstash Kubernetes pod, I have set LS_JVM_OPTS:= -Xmx1g -Xms500m, and monitoring the same using Prometheus grafana, I see memory usage 3.2 Gig. May I know what is happening here?

Answer 1

You are probably seeing the container memory used and not the heap size, there are other things in the JVM like the GC that require memory. Although, 3.2G seems a bit excessive for that heap, so you might want to check that the logstash JVM does indeed have those heap options.

$ kubectl exec -t <pod-name> -c <container-name> -- /bin/ps -Af | grep java

You can also check ️ what request/limits you have in your container, to see if you are requesting 3.2Gb initially.

kubectl get pod <logstash-pod-name> -c <container-name> -o=yaml