Merge pull request #1755 from tsj-30/fix/handle-single-node

k8s-ci-robot · web-flow · commit 07b1c4e681fe · 2025-10-13T01:36:56.000-07:00
descheduler: handle single-node clusters gracefully
diff --git a/pkg/descheduler/descheduler.go b/pkg/descheduler/descheduler.go
@@ -356,8 +356,8 @@ func (d *descheduler) runDeschedulerLoop(ctx context.Context, nodes []*v1.Node)
 
 	// if len is still <= 1 error out
 	if len(nodes) <= 1 {
-		klog.V(1).InfoS("The cluster size is 0 or 1 meaning eviction causes service disruption or degradation. So aborting..")
-		return fmt.Errorf("the cluster size is 0 or 1")
+		klog.InfoS("Skipping descheduling cycle: requires >=2 nodes", "found", len(nodes))
+		return nil // gracefully skip this cycle instead of aborting
 	}
 
 	var client clientset.Interface

Original file line number	Diff line number	Diff line change
`@@ -356,8 +356,8 @@ func (d descheduler) runDeschedulerLoop(ctx context.Context, nodes []v1.Node)`
`356`	`356`
`357`	`357`	`// if len is still <= 1 error out`
`358`	`358`	`if len(nodes) <= 1 {`
`359`		`- klog.V(1).InfoS("The cluster size is 0 or 1 meaning eviction causes service disruption or degradation. So aborting..")`
`360`		`- return fmt.Errorf("the cluster size is 0 or 1")`
	`359`	`+ klog.InfoS("Skipping descheduling cycle: requires >=2 nodes", "found", len(nodes))`
	`360`	`+ return nil // gracefully skip this cycle instead of aborting`
`361`	`361`	`}`
`362`	`362`
`363`	`363`	`var client clientset.Interface`