diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index cfbc616fdc7..389196f722a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -256,6 +256,9 @@ Trunk (Unreleased)
   OPTIMIZATIONS
     HDFS-5349. DNA_CACHE and DNA_UNCACHE should be by blockId only. (cmccabe)
 
+    HDFS-5665. Remove the unnecessary writeLock while initializing CacheManager
+    in FsNameSystem Ctor. (Uma Maheswara Rao G via Andrew Wang)
+
   BUG FIXES
     HADOOP-9635 Fix potential Stack Overflow in DomainSocket.c (V. Karthik Kumar
                 via cmccabe)
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
index 63756348e9b..fd3d06b2da9 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
@@ -735,12 +735,7 @@ public static FSNamesystem loadFromDisk(Configuration conf)
       this.dtSecretManager = createDelegationTokenSecretManager(conf);
       this.dir = new FSDirectory(fsImage, this, conf);
       this.snapshotManager = new SnapshotManager(dir);
-      writeLock();
-      try {
-        this.cacheManager = new CacheManager(this, conf, blockManager);
-      } finally {
-        writeUnlock();
-      }
+      this.cacheManager = new CacheManager(this, conf, blockManager);
       this.safeMode = new SafeModeInfo(conf);
       this.auditLoggers = initAuditLoggers(conf);
       this.isDefaultAuditLogger = auditLoggers.size() == 1 &&