From eebd8d26907e97f3faf8a73f0f81a096e34e79b1 Mon Sep 17 00:00:00 2001
From: Ted Yu <yuzhihong@gmail.com>
Date: Tue, 2 Apr 2019 15:45:46 -0700
Subject: [PATCH] Remove unnecessary map in cleanupHistory

---
 pkg/controller/daemon/update.go | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/pkg/controller/daemon/update.go b/pkg/controller/daemon/update.go
index 10bf24cf491..f45472ee959 100644
--- a/pkg/controller/daemon/update.go
+++ b/pkg/controller/daemon/update.go
@@ -160,21 +160,13 @@ func (dsc *DaemonSetsController) cleanupHistory(ds *apps.DaemonSet, old []*apps.
 		}
 	}
 
-	// Find all live history with the above hashes
-	liveHistory := make(map[string]bool)
-	for _, history := range old {
-		if hash := history.Labels[apps.DefaultDaemonSetUniqueLabelKey]; liveHashes[hash] {
-			liveHistory[history.Name] = true
-		}
-	}
-
 	// Clean up old history from smallest to highest revision (from oldest to newest)
 	sort.Sort(historiesByRevision(old))
 	for _, history := range old {
 		if toKill <= 0 {
 			break
 		}
-		if liveHistory[history.Name] {
+		if hash := history.Labels[apps.DefaultDaemonSetUniqueLabelKey]; liveHashes[hash] {
 			continue
 		}
 		// Clean up