introduce concurrent flags to controllers

[pigletfly]

Signed-off-by: pigletfly wangbing.adam@gmail.com

What type of PR is this?
/kind feature

What this PR does / why we need it:

Make controller reconcile concurrent configurable

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmada-controller-manager`: Introduced several flags to specify controller's capacities:
- --concurrent-work-syncs
- --concurrent-namespace-syncs
- --concurrent-resource-template-syncs
- --concurrent-cluster-syncs
- --concurrent-clusterresourcebinding-syncs
- --concurrent-resourcebinding-syncs

`karmada-agent`: Introduced several flags to specify controller's capacities:
- --concurrent-work-syncs
- --concurrent-cluster-syncs

The larger number of these flags means faster controller reconciles, but more CPU (and network) load.

[pigletfly]

if numbers of objects are huge,controller can't proccess them in time.In my case, pp objects get reconciled after serveral minutes.

[pigletfly]

/release-note-none

[pigletfly]

/priority important-soon

[pigletfly]

/cc @RainbowMango @Garrybest

[Garrybest]

Refer to #1260

[Garrybest]

Hi @pigletfly, what about make it easier by using ControllerConfigurationSpec in when NewManager? Like this.

controllerManager, err := controllerruntime.NewManager(config, controllerruntime.Options{
	Scheme:                     gclient.NewSchema(),
	SyncPeriod:                 &opts.ResyncPeriod.Duration,
	LeaderElection:             opts.LeaderElection.LeaderElect,
	LeaderElectionID:           opts.LeaderElection.ResourceName,
	LeaderElectionNamespace:    opts.LeaderElection.ResourceNamespace,
	LeaderElectionResourceLock: opts.LeaderElection.ResourceLock,
	HealthProbeBindAddress:     net.JoinHostPort(opts.BindAddress, strconv.Itoa(opts.SecurePort)),
	LivenessEndpointName:       "/healthz",
	Controller: v1alpha1.ControllerConfigurationSpec{
		GroupKindConcurrency: map[string]int{
			workv1alpha2.SchemeGroupVersion.WithKind("ResourceBinding"): rbConcurrentReconciles,
			workv1alpha2.SchemeGroupVersion.WithKind("ClusterResourceBinding"): crbConcurrentReconciles,
			workv1alpha1.SchemeGroupVersion.WithKind("Work"): workConcurrentReconciles,
			......
		},
	},
})

[pigletfly]

Hi @pigletfly, what about make it easier by using ControllerConfigurationSpec in when NewManager? Like this.

controllerManager, err := controllerruntime.NewManager(config, controllerruntime.Options{
	Scheme:                     gclient.NewSchema(),
	SyncPeriod:                 &opts.ResyncPeriod.Duration,
	LeaderElection:             opts.LeaderElection.LeaderElect,
	LeaderElectionID:           opts.LeaderElection.ResourceName,
	LeaderElectionNamespace:    opts.LeaderElection.ResourceNamespace,
	LeaderElectionResourceLock: opts.LeaderElection.ResourceLock,
	HealthProbeBindAddress:     net.JoinHostPort(opts.BindAddress, strconv.Itoa(opts.SecurePort)),
	LivenessEndpointName:       "/healthz",
	Controller: v1alpha1.ControllerConfigurationSpec{
		GroupKindConcurrency: map[string]int{
			workv1alpha2.SchemeGroupVersion.WithKind("ResourceBinding"): rbConcurrentReconciles,
			workv1alpha2.SchemeGroupVersion.WithKind("ClusterResourceBinding"): crbConcurrentReconciles,
			workv1alpha1.SchemeGroupVersion.WithKind("Work"): workConcurrentReconciles,
			......
		},
	},
})

that's fine with normal controllers (e.g,ResourceBinding) except detector,work,cluster.

[pigletfly]

@Garrybest @RainbowMango PTAL

[Garrybest]

I think you may forget this.

karmada/pkg/detector/detector.go

Line 97 in b5493cc

d.bindingReconcileWorker.Run(1, d.stopCh)

karmada/pkg/controllers/mcs/service_export_controller.go

Line 116 in b5493cc

c.worker.Run(c.WorkerNumber, c.StopChan)

[pigletfly]

I think you may forget this.

karmada/pkg/detector/detector.go

Line 97 in b5493cc

d.bindingReconcileWorker.Run(1, d.stopCh)

karmada/pkg/controllers/mcs/service_export_controller.go

Line 116 in b5493cc

c.worker.Run(c.WorkerNumber, c.StopChan)

good catch.But resourcebinding shares the same flag,we can't redefined in detector.Or we can hack like this flag.Lookup("resourcebinding-workers").Value.(flag.Getter).Get().(int) in detector.And I will send a separate PR to move resourcebinding reconcile all into resourcebinding_controller,then there will be only one flag.

xref #1309

[RainbowMango]

I just finished the detector part of the review.

[RainbowMango]

I guess we are good to go now.
@dddddai @Garrybest
Could you please take a look?

[dddddai]

/lgtm

[Garrybest]

Nice work👍
/lgtm

[RainbowMango]

/retitle introduce concurrent flags to controllers

[RainbowMango]

/approve

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