YARN-3056. Add verification for containerLaunchDuration in

TestNodeManagerMetrics. Contributed by zhihai Xu

hadoop-yarn-project/CHANGES.txt

@@ -467,6 +467,9 @@ Release 2.7.0 - UNRELEASED
 
     YARN-3113. Release audit warning for Sorting icons.psd. (stevel via kihwal)
 
+    YARN-3056. Add verification for containerLaunchDuration
+    in TestNodeManagerMetrics. (zhihai xu via xgong)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/metrics/TestNodeManagerMetrics.java

@@ -17,17 +17,20 @@
  */
 package org.apache.hadoop.yarn.server.nodemanager.metrics;
 
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.metrics2.MetricsRecordBuilder;
 import static org.apache.hadoop.test.MetricsAsserts.*;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.util.Records;
 
+import org.junit.Assert;
 import org.junit.Test;
 
 public class TestNodeManagerMetrics {
   static final int GiB = 1024; // MiB
 
   @Test public void testNames() {
+    DefaultMetricsSystem.initialize("NodeManager");
     NodeManagerMetrics metrics = NodeManagerMetrics.create();
     Resource total = Records.newRecord(Resource.class);
     total.setMemory(8*GiB);
@@ -61,7 +64,10 @@ public class TestNodeManagerMetrics {
 
     metrics.initingContainer();
     metrics.runningContainer();
+
+    Assert.assertTrue(!metrics.containerLaunchDuration.changed());
     metrics.addContainerLaunchDuration(1);
+    Assert.assertTrue(metrics.containerLaunchDuration.changed());
 
     // availableGB is expected to be floored,
     // while allocatedGB is expected to be ceiled.