scheduler: skip evict-leader-scheduler when setting schedule deny label

client/http/interface.go

@@ -81,6 +81,10 @@ type Client interface {
 	DeletePlacementRuleGroupByID(context.Context, string) error
 	GetAllRegionLabelRules(context.Context) ([]*LabelRule, error)
 	GetRegionLabelRulesByIDs(context.Context, []string) ([]*LabelRule, error)
+	// `SetRegionLabelRule` sets the label rule for a region.
+	// When a label rule (deny scheduler) is set,
+	//  1. All schedulers will be disabled except for the evict-leader-scheduler.
+	//  2. The merge-checker will be disabled, preventing these regions from being merged.
 	SetRegionLabelRule(context.Context, *LabelRule) error
 	PatchRegionLabelRules(context.Context, *LabelRulePatch) error
 	/* Scheduling-related interfaces */

pkg/schedule/schedulers/scheduler_controller.go

@@ -486,7 +486,8 @@ retry:
 			if labelMgr == nil {
 				continue
 			}
-			if labelMgr.ScheduleDisabled(region) {
+			_, ok := s.Scheduler.(*evictLeaderScheduler)
+			if labelMgr.ScheduleDisabled(region) && !ok {
 				denySchedulersByLabelerCounter.Inc()
 				continue retry
 			}