From ab727f4966b9f177784b84ac130a72e44347ecc4 Mon Sep 17 00:00:00 2001
From: Vinod Kumar Vavilapalli <vinodkv@apache.org>
Date: Wed, 17 Oct 2012 01:24:50 +0000
Subject: [PATCH] YARN-43. Fix TestResourceTrackerService to not depend on test
 order and thus pass on JDK7. Contributed by Thomas Graves.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1399066 13f79535-47bb-0310-9956-ffa450edef68
---
 hadoop-yarn-project/CHANGES.txt                          | 3 +++
 .../yarn/server/resourcemanager/ClusterMetrics.java      | 9 ++++++++-
 .../resourcemanager/TestResourceTrackerService.java      | 1 +
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 22ead622a5..c575c3b964 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -148,6 +148,9 @@ Release 0.23.5 - UNRELEASED
     YARN-161. Fix multiple compiler warnings for unchecked operations in YARN
     common. (Chris Nauroth via vinodkv)
 
+    YARN-43. Fix TestResourceTrackerService to not depend on test order and thus
+    pass on JDK7. (Thomas Graves via vinodkv)
+
   OPTIMIZATIONS
 
   BUG FIXES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ClusterMetrics.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ClusterMetrics.java
index e187fbdbde..5c94ef4190 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ClusterMetrics.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ClusterMetrics.java
@@ -30,7 +30,7 @@
 import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.metrics2.lib.MetricsRegistry;
 import org.apache.hadoop.metrics2.lib.MutableGaugeInt;
-import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeEventType;
+import com.google.common.annotations.VisibleForTesting;
 
 @InterfaceAudience.Private
 @Metrics(context="yarn")
@@ -71,6 +71,12 @@ private static void registerMetrics() {
       ms.register("ClusterMetrics", "Metrics for the Yarn Cluster", INSTANCE);
     }
   }
+
+  @VisibleForTesting
+  synchronized static void destroy() {
+    isInitialized.set(false);
+    INSTANCE = null;
+  }
   
   //Active Nodemanagers
   public int getNumActiveNMs() {
@@ -136,4 +142,5 @@ public void incrNumActiveNodes() {
   public void decrNumActiveNodes() {
     numActiveNMs.decr();
   }
+
 }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestResourceTrackerService.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestResourceTrackerService.java
index 45b0c9933d..7e5b5da935 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestResourceTrackerService.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestResourceTrackerService.java
@@ -414,6 +414,7 @@ public void tearDown() {
     if (hostFile != null && hostFile.exists()) {
       hostFile.delete();
     }
+    ClusterMetrics.destroy();
     if (rm != null) {
       rm.stop();
     }