Regarding history size

[223311]

Hi friend, I was testing PHPA in one of the EKS clusters and noticed that the history size for the linear regression model is being displayed. I have a few questions regarding this. I would appreciate it if you could provide some details. Thank you.

1. Does PHPA save the history size for the linear regression model in memory, or does it use a config map to store it?
2. In the event of software reinstallation, how can the old data be retrieved?
3. When I run 'kubectl get HPA', the HPA details are not displayed. In this case, how can we determine the current usage of pod and memory? @jthomperoo

[jthomperoo]

Hi @223311,

1. The history is stored in a config map, not in memory, so it is persisted across restarts etc.
2. If you uninstall the PHPA operator/a PHPA any config maps will also be removed, so it is not possible to recover old data.
3. You can use kubectl get phpa to view the PHPAs you have on your system. It does not expose the CPU/memory usage of pods, it only provides these columns:

• Reference = The identifier for the resource being scaled in the format /<api-kind/
• Min Pods = The minimum number of replicas of pods that the resource being managed by the autoscaler can have
• Max Pods = The maximum number of replicas of pods that the resource being managed by the autoscaler can have
• Replicas = The desired number of replicas of pods managed by this autoscaler as last calculated by the autoscaler
• Last Scale Time = The last time the PredictiveHorizontalPodAutoscaler scaled the number of pods