App is scaling up and not scaling down due to memory not reducing for my app

[varun0828]

I have configured autoscaling (using memory rule min:30 max:70) to the spring boot app in PCF and giving the load . Based on the load the memory is increasing and scaling up is working fine .

Issue is when I stopped giving the load to the application and the CPU is reducing ,but the momory is not reducing and scaling down is not working.

I have checked the garbage collector and it is functioning .

What could be the reasons and why the memory is not reducing for my app even though there is no laod on the app ?

Please help me on this .

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/179891752

The labels on this github issue will be updated when the story is started.

[silvestre]

Hi @varun0828,

unfortunately, this is not really something we can help you with, as this is an issue with your app and its runtime.

A hint though: As you are using Java, you would need to either use Java 12+ with G1 GC or switch to the Shenandoah GC on Java 11 for the GC to start returning memory to the OS.

Best regards,
Silvestre