jiangpengcheng commented on pull request #5029:
URL: https://github.com/apache/openwhisk/pull/5029#issuecomment-730092024
@style95 @bdoyle0182 below is a brief introducation for throttling in new
scheduler:
new scheduler is using a different throttling logic, it doesn't consider the
per minute and concurrent limitations :
- for a namespace, it limit **how many containers a namespace can have**, if
exceed, it enables throttle for the namespace
- for an action, it limit **how many activations can wait in a queue**, if
exceed, it enables throttle for the action
when any throttle is enabled, scheduler will save it into ETCD, and the
`FPCLoadBalancer` will listen to such throttling data and save/update them in a
map
And for an incoming activation, the `FPCLoadBalancer` will use below logic
to decide whether reject or accpet it
```
* Action Throttle true -> 429
* false -> Pass
* not exist -> Namespace Throttle true -> 429
* false -> Pass
* not exist -> Pass
```
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