diff --git a/pkg/schedule/checker/checker_controller.go b/pkg/schedule/checker/checker_controller.go
index 355226cd2d8..cdc826a1dda 100644
--- a/pkg/schedule/checker/checker_controller.go
+++ b/pkg/schedule/checker/checker_controller.go
@@ -31,7 +31,7 @@ import (
 )
 
 // DefaultCacheSize is the default length of waiting list.
-const DefaultCacheSize = 1000
+const DefaultCacheSize = 100000
 
 var denyCheckersByLabelerCounter = labeler.LabelerEventCounter.WithLabelValues("checkers", "deny")