Adding Concurrency in Pool Manager (#1698)

Concurrency in the pool manager allows specializing pods concurrently based on a specified limit. 

Co-authored-by: Vishal <vishal-biyani@users.noreply.github.com>

pkg/fission-cli/cmd/function/create.go

@@ -41,6 +41,7 @@ import (
 const (
 	DEFAULT_MIN_SCALE             = 1
 	DEFAULT_TARGET_CPU_PERCENTAGE = 80
+	DEFAULT_CONCURRENCY           = 5
 )
 
 type CreateSubCommand struct {
@@ -96,6 +97,11 @@ func (opts *CreateSubCommand) complete(input cli.Input) error {
 
 	fnIdleTimeout := input.Int(flagkey.FnIdleTimeout)
 
+	fnConcurrency := DEFAULT_CONCURRENCY
+	if input.IsSet(flagkey.FnConcurrency) {
+		fnConcurrency = input.Int(flagkey.FnConcurrency)
+	}
+
 	pkgName := input.String(flagkey.FnPackageName)
 
 	secretNames := input.StringSlice(flagkey.FnSecret)
@@ -294,6 +300,7 @@ func (opts *CreateSubCommand) complete(input cli.Input) error {
 			InvokeStrategy:  *invokeStrategy,
 			FunctionTimeout: fnTimeout,
 			IdleTimeout:     &fnIdleTimeout,
+			Concurrency:     fnConcurrency,
 		},
 	}