HADOOP-15486. Make NetworkTopology#netLock fair. Contributed by Nanda kumar.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/be22e242
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/be22e242
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/be22e242

Branch: refs/heads/branch-2.7
Commit: be22e242ac66322958f47dec14db8424f908e7d3
Parents: 7be1bc5
Author: Arpit Agarwal <a...@apache.org>
Authored: Wed May 23 10:30:12 2018 -0700
Committer: Arpit Agarwal <a...@apache.org>
Committed: Wed May 23 10:31:39 2018 -0700

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 .../src/main/java/org/apache/hadoop/net/NetworkTopology.java       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/be22e242/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
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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 d242119..5eeb0d0 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
@@ -389,7 +389,7 @@ public class NetworkTopology {
   private boolean clusterEverBeenMultiRack = false;
 
   /** the lock used to manage access */
-  protected ReadWriteLock netlock = new ReentrantReadWriteLock();
+  protected ReadWriteLock netlock = new ReentrantReadWriteLock(true);
 
   public NetworkTopology() {
     clusterMap = new InnerNode(InnerNode.ROOT);


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