From 50c39db1ad60b0cd131c554f989c9ae4c7474251 Mon Sep 17 00:00:00 2001
From: Arpit Agarwal <arp@apache.org>
Date: Wed, 23 May 2018 10:30:12 -0700
Subject: [PATCH] HADOOP-15486. Make NetworkTopology#netLock fair. Contributed
 by Nanda kumar.

---
 .../src/main/java/org/apache/hadoop/net/NetworkTopology.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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 256f07b696b..1f077a753bb 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
@@ -105,7 +105,7 @@ protected NetworkTopology init(InnerNode.Factory factory) {
   private boolean clusterEverBeenMultiRack = false;
 
   /** the lock used to manage access */
-  protected ReadWriteLock netlock = new ReentrantReadWriteLock();
+  protected ReadWriteLock netlock = new ReentrantReadWriteLock(true);
 
   // keeping the constructor because other components like MR still uses this.
   public NetworkTopology() {