Executor failing when request burst is more than poolsize

[swaroopnuli]

Fission/Kubernetes version
AWS EKS 1.17.1

$ fission --version
$ kubectl version
client:
  fission/core:
    BuildDate: "2020-10-20T14:43:45Z"
    GitCommit: 52508e19343ef93da4ce8960908c5569f44da225
    Version: 1.11.2
server:
  fission/core:
    BuildDate: unknown
    GitCommit: unknown
    Version: unknown

Kubernetes platform (e.g. Google Kubernetes Engine)
AWS EKS
Describe the bug

When the HTTP function call request burst is more than the poolsize, the new pods are not spawned.
To Reproduce

function poolsize: 20
concurrent request burst: 100 (substantially higher than poolszie)
function HTTP trigger: POST
Expected result

unmanaged pods should scale out and handle more load
Actual result
executed failing and no more scaling up of the pods

Screenshots/Dump file

fission-dump_1607955728.zip

$ fission support dump

Additional context