Dashboard: Kubernetes Dashboard freezes

[Eddman]

Environment

Installation method: kubeadm
Kubernetes version: 1.16.9
Dashboard version: 2.0.0
Operating system: N/A
Node.js version ('node --version' output): N/A
Go version ('go version' output): N/A

Steps to reproduce

Open Dashboard on any screen that contains charts. Leave it open/continue browsing on other tabs.

Observed result

After few minutes of inactivity the Dashboard page is not responding anymore. It is frozen and tab has to be closed.

Expected result

Dashboard will not freeze like that.

Comments

I guess the problem is with the new "reloading" mechanism. It does re-fetch every 5 seconds in my case.

[floreks]

It might be due to browser throttling mechanism for inactive tabs. Dashboard still works in background but does not have enough resources to properly work and short 5s refresh might cause request overlap that builds up over time causing tab freeze. Right now workaround would be to increase refresh time to at least 10s for larger clusters. On small clusters with fast API responses it should not happen.

We will try to use Page Visibility API to disable periodic requests when tab is inactive and resume them once it is active again.

[superbiche]

Couldn't the calls use debounce instead of throttle so the calls aren't stacked?
Or set the call in a var that's canceled either when it succeeds or when the next call starts?

[floreks]

debounce will not work here as right now it is called by the timer set to a specific interval. Best solution would be to stop all timers when tab is not focused.

[VampireDX]

I met similar problem, all kubernetes-dashboard backend logs is seemed good, but the UI is freezed. The browser inspecter shows a lot of requests don't get any response.

2020/05/14 08:18:25 Getting list of all replica sets in the cluster
2020/05/14 08:18:25 [2020-05-14T08:18:25Z] Outcoming response to 10.244.0.0:20979 with 200 status code
2020/05/14 08:18:25 Getting pod metrics
2020/05/14 08:18:25 [2020-05-14T08:18:25Z] Outcoming response to 10.244.0.0:20979 with 200 status code
2020/05/14 08:18:25 [2020-05-14T08:18:25Z] Outcoming response to 10.244.0.0:20979 with 200 status code