fix unittest

Author: zhengchenyu

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/TestGetGroups.java

@@ -24,6 +24,7 @@
 import java.util.concurrent.TimeUnit;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.service.Service;
 import org.apache.hadoop.service.Service.STATE;
 import org.apache.hadoop.service.ServiceStateChangeListener;
@@ -39,6 +40,10 @@
 import org.slf4j.LoggerFactory;
 
 public class TestGetGroups extends GetGroupsTestBase {
+
+  static {
+    DefaultMetricsSystem.setMiniClusterMode(true);
+  }
 
   private static final Logger LOG =
           LoggerFactory.getLogger(TestGetGroups.class);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/TestResourceManagerAdministrationProtocolPBClientImpl.java

@@ -23,6 +23,7 @@
 import java.util.concurrent.TimeUnit;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.service.Service;
 import org.apache.hadoop.service.Service.STATE;
 import org.apache.hadoop.service.ServiceStateChangeListener;
@@ -60,6 +61,11 @@
  * Test ResourceManagerAdministrationProtocolPBClientImpl. Test a methods and the proxy without  logic.
  */
 public class TestResourceManagerAdministrationProtocolPBClientImpl {
+
+  static {
+    DefaultMetricsSystem.setMiniClusterMode(true);
+  }
+
   private static ResourceManager resourceManager;
   private static final Logger LOG = LoggerFactory
           .getLogger(TestResourceManagerAdministrationProtocolPBClientImpl.class);