From 971a4c8e8328a4bdea65de4a0e84c82b5b2de24b Mon Sep 17 00:00:00 2001
From: Wei-Chiu Chuang <weichiu@apache.org>
Date: Fri, 16 Aug 2019 17:19:13 -0700
Subject: [PATCH] HDFS-14523. Remove excess read lock for NetworkToplogy.
 Contributed by Wu Weiwei.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
Reviewed-by: Chen Liang <cliang@apache.org>
---
 .../org/apache/hadoop/net/NetworkTopology.java     | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
index 6fc4acc941..9f608de515 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
@@ -295,22 +295,12 @@ public String getRack(String loc) {
   
   /** @return the total number of racks */
   public int getNumOfRacks() {
-    netlock.readLock().lock();
-    try {
-      return numOfRacks;
-    } finally {
-      netlock.readLock().unlock();
-    }
+    return numOfRacks;
   }
 
   /** @return the total number of leaf nodes */
   public int getNumOfLeaves() {
-    netlock.readLock().lock();
-    try {
-      return clusterMap.getNumOfLeaves();
-    } finally {
-      netlock.readLock().unlock();
-    }
+    return clusterMap.getNumOfLeaves();
   }
 
   /** Return the distance between two nodes