feat: Expose the Cron workflow workers as argument

cmd/workflow-controller/main.go

@@ -57,6 +57,7 @@ func NewRootCommand() *cobra.Command {
 		workflowWorkers         int    // --workflow-workers
 		workflowTTLWorkers      int    // --workflow-ttl-workers
 		podCleanupWorkers       int    // --pod-cleanup-workers
+		cronWorkflowWorkers     int    // --cron-workflow-workers
 		burst                   int
 		qps                     float32
 		namespaced              bool   // --namespaced
@@ -116,7 +117,7 @@ func NewRootCommand() *cobra.Command {
 			if leaderElectionOff == "true" {
 				log.Info("Leader election is turned off. Running in single-instance mode")
 				log.WithField("id", "single-instance").Info("starting leading")
-				go wfController.Run(ctx, workflowWorkers, workflowTTLWorkers, podCleanupWorkers)
+				go wfController.Run(ctx, workflowWorkers, workflowTTLWorkers, podCleanupWorkers, cronWorkflowWorkers)
 				go wfController.RunMetricsServer(ctx, false)
 			} else {
 				nodeID, ok := os.LookupEnv("LEADER_ELECTION_IDENTITY")
@@ -146,7 +147,7 @@ func NewRootCommand() *cobra.Command {
 					Callbacks: leaderelection.LeaderCallbacks{
 						OnStartedLeading: func(ctx context.Context) {
 							dummyCancel()
-							go wfController.Run(ctx, workflowWorkers, workflowTTLWorkers, podCleanupWorkers)
+							go wfController.Run(ctx, workflowWorkers, workflowTTLWorkers, podCleanupWorkers, cronWorkflowWorkers)
 							go wfController.RunMetricsServer(ctx, false)
 						},
 						OnStoppedLeading: func() {
@@ -183,6 +184,7 @@ func NewRootCommand() *cobra.Command {
 	command.Flags().IntVar(&workflowWorkers, "workflow-workers", 32, "Number of workflow workers")
 	command.Flags().IntVar(&workflowTTLWorkers, "workflow-ttl-workers", 4, "Number of workflow TTL workers")
 	command.Flags().IntVar(&podCleanupWorkers, "pod-cleanup-workers", 4, "Number of pod cleanup workers")
+	command.Flags().IntVar(&cronWorkflowWorkers, "cron-workflow-workers", 8, "Number of cron workflow workers")
 	command.Flags().IntVar(&burst, "burst", 30, "Maximum burst for throttle.")
 	command.Flags().Float32Var(&qps, "qps", 20.0, "Queries per second")
 	command.Flags().BoolVar(&namespaced, "namespaced", false, "run workflow-controller as namespaced mode")

workflow/controller/controller.go

@@ -217,10 +217,10 @@ func (wfc *WorkflowController) runGCcontroller(ctx context.Context, workflowTTLW
 	}
 }
 
-func (wfc *WorkflowController) runCronController(ctx context.Context) {
+func (wfc *WorkflowController) runCronController(ctx context.Context, cronWorkflowWorkers int) {
 	defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
 
-	cronController := cron.NewCronController(wfc.wfclientset, wfc.dynamicInterface, wfc.namespace, wfc.GetManagedNamespace(), wfc.Config.InstanceID, wfc.metrics, wfc.eventRecorderManager)
+	cronController := cron.NewCronController(wfc.wfclientset, wfc.dynamicInterface, wfc.namespace, wfc.GetManagedNamespace(), wfc.Config.InstanceID, wfc.metrics, wfc.eventRecorderManager, cronWorkflowWorkers)
 	cronController.Run(ctx)
 }
 
@@ -235,7 +235,7 @@ var indexers = cache.Indexers{
 }
 
 // Run starts an Workflow resource controller
-func (wfc *WorkflowController) Run(ctx context.Context, wfWorkers, workflowTTLWorkers, podCleanupWorkers int) {
+func (wfc *WorkflowController) Run(ctx context.Context, wfWorkers, workflowTTLWorkers, podCleanupWorkers, cronWorkflowWorkers int) {
 	defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
 
 	// init DB after leader election (if enabled)
@@ -305,7 +305,7 @@ func (wfc *WorkflowController) Run(ctx context.Context, wfWorkers, workflowTTLWo
 	go wfc.archivedWorkflowGarbageCollector(ctx.Done())
 
 	go wfc.runGCcontroller(ctx, workflowTTLWorkers)
-	go wfc.runCronController(ctx)
+	go wfc.runCronController(ctx, cronWorkflowWorkers)
 	go wait.Until(wfc.syncWorkflowPhaseMetrics, 15*time.Second, ctx.Done())
 	go wait.Until(wfc.syncPodPhaseMetrics, 15*time.Second, ctx.Done())
 

workflow/cron/controller.go

@@ -48,11 +48,11 @@ type Controller struct {
 	dynamicInterface     dynamic.Interface
 	metrics              *metrics.Metrics
 	eventRecorderManager events.EventRecorderManager
+	cronWorkflowWorkers  int
 }
 
 const (
 	cronWorkflowResyncPeriod = 20 * time.Minute
-	cronWorkflowWorkers      = 8
 )
 
 var (
@@ -68,7 +68,7 @@ func init() {
 	log.WithField("cronSyncPeriod", cronSyncPeriod).Info("cron config")
 }
 
-func NewCronController(wfclientset versioned.Interface, dynamicInterface dynamic.Interface, namespace string, managedNamespace string, instanceId string, metrics *metrics.Metrics, eventRecorderManager events.EventRecorderManager) *Controller {
+func NewCronController(wfclientset versioned.Interface, dynamicInterface dynamic.Interface, namespace string, managedNamespace string, instanceId string, metrics *metrics.Metrics, eventRecorderManager events.EventRecorderManager, cronWorkflowWorkers int) *Controller {
 	return &Controller{
 		wfClientset:          wfclientset,
 		namespace:            namespace,
@@ -80,6 +80,7 @@ func NewCronController(wfclientset versioned.Interface, dynamicInterface dynamic
 		cronWfQueue:          metrics.RateLimiterWithBusyWorkers(workqueue.DefaultControllerRateLimiter(), "cron_wf_queue"),
 		metrics:              metrics,
 		eventRecorderManager: eventRecorderManager,
+		cronWorkflowWorkers:  cronWorkflowWorkers,
 	}
 }
 
@@ -110,7 +111,7 @@ func (cc *Controller) Run(ctx context.Context) {
 
 	go wait.UntilWithContext(ctx, cc.syncAll, cronSyncPeriod)
 
-	for i := 0; i < cronWorkflowWorkers; i++ {
+	for i := 0; i < cc.cronWorkflowWorkers; i++ {
 		go wait.Until(cc.runCronWorker, time.Second, ctx.Done())
 	}