From d99bdfffc8792d324bbd2ca985c81a556ca5427d Mon Sep 17 00:00:00 2001
From: Jan Chaloupka <jchaloup@redhat.com>
Date: Tue, 16 Aug 2022 13:38:11 +0200
Subject: [PATCH] NodeFit: do not check whether node fitsRequest when a pod is
 already assigned to the node

---
 pkg/descheduler/node/node.go | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/pkg/descheduler/node/node.go b/pkg/descheduler/node/node.go
index e95606325..c476ec98e 100644
--- a/pkg/descheduler/node/node.go
+++ b/pkg/descheduler/node/node.go
@@ -119,9 +119,11 @@ func NodeFit(nodeIndexer podutil.GetPodsAssignedToNodeFunc, pod *v1.Pod, node *v
 		errors = append(errors, fmt.Errorf("pod does not tolerate taints on the node"))
 	}
 	// Check if the pod can fit on a node based off it's requests
-	ok, reqErrors := fitsRequest(nodeIndexer, pod, node)
-	if !ok {
-		errors = append(errors, reqErrors...)
+	if pod.Spec.NodeName == "" || pod.Spec.NodeName != node.Name {
+		ok, reqErrors := fitsRequest(nodeIndexer, pod, node)
+		if !ok {
+			errors = append(errors, reqErrors...)
+		}
 	}
 	// Check if node is schedulable
 	if IsNodeUnschedulable(node) {