From 002dcc4ebf79bbaa5e603565640d8289991d781f Mon Sep 17 00:00:00 2001
From: Sunil G <sunilg@apache.org>
Date: Wed, 3 Apr 2019 18:57:28 +0530
Subject: [PATCH] YARN-4901. QueueMetrics needs to be cleared before MockRM is
 initialized. Contributed by Peter Bacsko.

---
 .../apache/hadoop/yarn/server/resourcemanager/MockRM.java    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/MockRM.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/MockRM.java
index b45ce6697fd..a0dad817ced 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/MockRM.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/MockRM.java
@@ -32,6 +32,7 @@ import java.util.Set;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.DataOutputBuffer;
 import org.apache.hadoop.test.GenericTestUtils;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.security.Credentials;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
@@ -100,6 +101,7 @@ import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeEventType;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeStartedEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.AbstractYarnScheduler;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.QueueMetrics;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplication;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNode;
@@ -156,6 +158,9 @@ public class MockRM extends ResourceManager {
   public MockRM(Configuration conf, RMStateStore store,
       boolean useNullRMNodeLabelsManager, boolean useRealElector) {
     super();
+    // Clear metrics to avoid possible interference between tests
+    DefaultMetricsSystem.shutdown();
+    QueueMetrics.clearQueueMetrics();
     if (conf.getBoolean(TestResourceProfiles.TEST_CONF_RESET_RESOURCE_TYPES,
         true)) {
       ResourceUtils.resetResourceTypes(conf);