Always overwrite items in kubelet's work queue

This allows kubelet to change the next sync time based on the last result.

pkg/kubelet/util/queue/work_queue.go

@@ -29,8 +29,7 @@ import (
 type WorkQueue interface {
 	// GetWork dequeues and returns all ready items.
 	GetWork() []types.UID
-	// Enqueue inserts a new item or overwrites an existing item with the
+	// Enqueue inserts a new item or overwrites an existing item.
-	// new timestamp (time.Now() + delay) if it is greater.
 	Enqueue(item types.UID, delay time.Duration)
 }
 
@@ -64,10 +63,5 @@ func (q *basicWorkQueue) GetWork() []types.UID {
 func (q *basicWorkQueue) Enqueue(item types.UID, delay time.Duration) {
 	q.lock.Lock()
 	defer q.lock.Unlock()
-	now := q.clock.Now()
+	q.queue[item] = q.clock.Now().Add(delay)
-	timestamp := now.Add(delay)
-	existing, ok := q.queue[item]
-	if !ok || (ok && existing.Before(timestamp)) {
-		q.queue[item] = timestamp
-	}
 }

pkg/kubelet/util/queue/work_queue_test.go

@@ -63,15 +63,3 @@ func TestGetWork(t *testing.T) {
 	compareResults(t, expected, q.GetWork())
 	compareResults(t, []types.UID{}, q.GetWork())
 }
-
-func TestEnqueueKeepGreaterTimestamp(t *testing.T) {
-	q, _ := newTestBasicWorkQueue()
-	item := types.UID("foo")
-	q.Enqueue(item, -7*time.Hour)
-	q.Enqueue(item, 3*time.Hour)
-	compareResults(t, []types.UID{}, q.GetWork())
-
-	q.Enqueue(item, 3*time.Hour)
-	q.Enqueue(item, -7*time.Hour)
-	compareResults(t, []types.UID{}, q.GetWork())
-}