YARN-5575. Many classes use bare yarn. properties instead of the defined constants. Contributed by Daniel Templeton.

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/ipc/TestMRCJCSocketFactory.java

@@ -33,6 +33,7 @@
 import org.apache.hadoop.mapreduce.MRConfig;
 import org.apache.hadoop.mapreduce.v2.MiniMRYarnCluster;
 import org.apache.hadoop.net.StandardSocketFactory;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -87,9 +88,9 @@ public void testSocketFactory() throws IOException {
       jconf.set("hadoop.rpc.socket.factory.class.default",
                 "org.apache.hadoop.ipc.DummySocketFactory");
       jconf.set(MRConfig.FRAMEWORK_NAME, MRConfig.YARN_FRAMEWORK_NAME);
-      String rmAddress = jconf.get("yarn.resourcemanager.address");
+      String rmAddress = jconf.get(YarnConfiguration.RM_ADDRESS);
       String[] split = rmAddress.split(":");
-      jconf.set("yarn.resourcemanager.address", split[0] + ':'
+      jconf.set(YarnConfiguration.RM_ADDRESS, split[0] + ':'
           + (Integer.parseInt(split[1]) + 10));
       client = new JobClient(jconf);
 

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/v2/TestMRJobs.java

@@ -163,7 +163,7 @@ public static void setup() throws IOException {
       Configuration conf = new Configuration();
       conf.set("fs.defaultFS", remoteFs.getUri().toString());   // use HDFS
       conf.set(MRJobConfig.MR_AM_STAGING_DIR, "/apps_staging_dir");
-      conf.setInt("yarn.cluster.max-application-priority", 10);
+      conf.setInt(YarnConfiguration.MAX_CLUSTER_LEVEL_APPLICATION_PRIORITY, 10);
       mrCluster.init(conf);
       mrCluster.start();
     }
@@ -418,8 +418,7 @@ public void testJobWithChangePriority() throws Exception {
     // set master address to local to test that local mode applied if framework
     // equals local
     sleepConf.set(MRConfig.MASTER_ADDRESS, "local");
-    sleepConf
-        .setInt("yarn.app.mapreduce.am.scheduler.heartbeat.interval-ms", 5);
+    sleepConf.setInt(MRJobConfig.MR_AM_TO_RM_HEARTBEAT_INTERVAL_MS, 5);
 
     SleepJob sleepJob = new SleepJob();
     sleepJob.setConf(sleepConf);

hadoop-tools/hadoop-gridmix/src/test/java/org/apache/hadoop/mapred/gridmix/GridmixTestUtils.java

@@ -11,6 +11,7 @@
 import org.apache.hadoop.mapreduce.MRJobConfig;
 import org.apache.hadoop.mapreduce.server.jobtracker.JTConfig;
 import org.apache.hadoop.conf.Configuration;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.PREFIX;
 
 import java.io.IOException;
 
@@ -45,8 +46,8 @@ public static void initCluster(Class<?> caller) throws IOException {
     Configuration conf = new Configuration();
 //    conf.set("mapred.queue.names", "default,q1,q2");
   conf.set("mapred.queue.names", "default");
-    conf.set("yarn.scheduler.capacity.root.queues", "default");
-    conf.set("yarn.scheduler.capacity.root.default.capacity", "100.0");
+    conf.set(PREFIX + "root.queues", "default");
+    conf.set(PREFIX + "root.default.capacity", "100.0");
     
     
     conf.setBoolean(GRIDMIX_USE_QUEUE_IN_TRACE, false);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestDistributedShell.java

@@ -220,7 +220,8 @@ private void setupInternal(int numNodeManager, float timelineVersion)
         throw new RuntimeException("Could not find 'yarn-site.xml' dummy file in classpath");
       }
       Configuration yarnClusterConfig = yarnCluster.getConfig();
-      yarnClusterConfig.set("yarn.application.classpath", new File(url.getPath()).getParent());
+      yarnClusterConfig.set(YarnConfiguration.YARN_APPLICATION_CLASSPATH,
+          new File(url.getPath()).getParent());
       //write the document to a buffer (not directly to the file, as that
       //can cause the file being written to get read -which will then fail.
       ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
@@ -234,8 +235,7 @@ private void setupInternal(int numNodeManager, float timelineVersion)
     FileContext fsContext = FileContext.getLocalFSFileContext();
     fsContext
         .delete(
-            new Path(conf
-                .get("yarn.timeline-service.leveldb-timeline-store.path")),
+            new Path(conf.get(YarnConfiguration.TIMELINE_SERVICE_LEVELDB_PATH)),
             true);
     try {
       Thread.sleep(2000);
@@ -263,8 +263,7 @@ public void tearDown() throws IOException {
     FileContext fsContext = FileContext.getLocalFSFileContext();
     fsContext
         .delete(
-            new Path(conf
-                .get("yarn.timeline-service.leveldb-timeline-store.path")),
+            new Path(conf.get(YarnConfiguration.TIMELINE_SERVICE_LEVELDB_PATH)),
             true);
   }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestDistributedShellWithNodeLabels.java

@@ -28,6 +28,7 @@
 import org.apache.hadoop.yarn.server.nodemanager.NodeManager;
 import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
 import org.apache.hadoop.yarn.server.resourcemanager.nodelabels.RMNodeLabelsManager;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.PREFIX;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
@@ -57,13 +58,12 @@ private void initializeNodeLabels() throws IOException {
     labelsMgr.addToCluserNodeLabelsWithDefaultExclusivity(labels);
 
     // Setup queue access to node labels
-    distShellTest.conf.set("yarn.scheduler.capacity.root.accessible-node-labels", "x");
-    distShellTest.conf.set("yarn.scheduler.capacity.root.accessible-node-labels.x.capacity",
-        "100");
-    distShellTest.conf.set("yarn.scheduler.capacity.root.default.accessible-node-labels", "x");
-    distShellTest.conf.set(
-        "yarn.scheduler.capacity.root.default.accessible-node-labels.x.capacity",
+    distShellTest.conf.set(PREFIX + "root.accessible-node-labels", "x");
+    distShellTest.conf.set(PREFIX + "root.accessible-node-labels.x.capacity",
         "100");
+    distShellTest.conf.set(PREFIX + "root.default.accessible-node-labels", "x");
+    distShellTest.conf.set(PREFIX
+        + "root.default.accessible-node-labels.x.capacity", "100");
 
     rmContext.getScheduler().reinitialize(distShellTest.conf, rmContext);
 

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

@@ -80,6 +80,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration;
 import org.apache.hadoop.yarn.util.Records;
 import org.apache.hadoop.yarn.util.Times;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.PREFIX;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
@@ -1704,8 +1705,7 @@ public void testGetQueueInfoPreemptionDisabled() throws Exception {
         "org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity."
         + "ProportionalCapacityPreemptionPolicy");
     conf.setBoolean(YarnConfiguration.RM_SCHEDULER_ENABLE_MONITORS, true);
-    conf.setBoolean(
-        "yarn.scheduler.capacity.root.a.a1.disable_preemption", true);
+    conf.setBoolean(PREFIX + "root.a.a1.disable_preemption", true);
     MiniYARNCluster cluster =
         new MiniYARNCluster("testReservationAPIs", 2, 1, 1);
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/test/java/org/apache/hadoop/yarn/server/timeline/security/TestTimelineAuthenticationFilterInitializer.java

@@ -23,6 +23,7 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.http.FilterContainer;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import static org.apache.hadoop.yarn.server.timeline.security.TimelineAuthenticationFilterInitializer.PREFIX;
 import org.junit.Test;
 import org.mockito.Mockito;
 
@@ -35,36 +36,30 @@ public void testProxyUserConfiguration() {
     for (int i = 0; i < 3; ++i) {
       Configuration conf = new YarnConfiguration();
       switch (i) {
-        case 0:
-          // hadoop.proxyuser prefix
-          conf.set("hadoop.proxyuser.foo.hosts", "*");
-          conf.set("hadoop.proxyuser.foo.users", "*");
-          conf.set("hadoop.proxyuser.foo.groups", "*");
-          break;
-        case 1:
-          // yarn.timeline-service.http-authentication.proxyuser prefix
-          conf.set("yarn.timeline-service.http-authentication.proxyuser.foo.hosts",
-              "*");
-          conf.set("yarn.timeline-service.http-authentication.proxyuser.foo.users",
-              "*");
-          conf.set("yarn.timeline-service.http-authentication.proxyuser.foo.groups",
-              "*");
-          break;
-        case 2:
-          // hadoop.proxyuser prefix has been overwritten by
-          // yarn.timeline-service.http-authentication.proxyuser prefix
-          conf.set("hadoop.proxyuser.foo.hosts", "bar");
-          conf.set("hadoop.proxyuser.foo.users", "bar");
-          conf.set("hadoop.proxyuser.foo.groups", "bar");
-          conf.set("yarn.timeline-service.http-authentication.proxyuser.foo.hosts",
-              "*");
-          conf.set("yarn.timeline-service.http-authentication.proxyuser.foo.users",
-              "*");
-          conf.set("yarn.timeline-service.http-authentication.proxyuser.foo.groups",
-              "*");
-          break;
-        default:
-          break;
+      case 0:
+        // hadoop.proxyuser prefix
+        conf.set("hadoop.proxyuser.foo.hosts", "*");
+        conf.set("hadoop.proxyuser.foo.users", "*");
+        conf.set("hadoop.proxyuser.foo.groups", "*");
+        break;
+      case 1:
+        // yarn.timeline-service.http-authentication.proxyuser prefix
+        conf.set(PREFIX + "proxyuser.foo.hosts", "*");
+        conf.set(PREFIX + "proxyuser.foo.users", "*");
+        conf.set(PREFIX + "proxyuser.foo.groups", "*");
+        break;
+      case 2:
+        // hadoop.proxyuser prefix has been overwritten by
+        // yarn.timeline-service.http-authentication.proxyuser prefix
+        conf.set("hadoop.proxyuser.foo.hosts", "bar");
+        conf.set("hadoop.proxyuser.foo.users", "bar");
+        conf.set("hadoop.proxyuser.foo.groups", "bar");
+        conf.set(PREFIX + "proxyuser.foo.hosts", "*");
+        conf.set(PREFIX + "proxyuser.foo.users", "*");
+        conf.set(PREFIX + "proxyuser.foo.groups", "*");
+        break;
+      default:
+        break;
       }
 
       TimelineAuthenticationFilterInitializer initializer =

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/ReservationACLsTestBase.java

@@ -549,8 +549,8 @@ private static Configuration createCapacitySchedulerConfiguration() {
     csConf.setBoolean(YarnConfiguration.RM_RESERVATION_SYSTEM_ENABLE, true);
     csConf.setBoolean(YarnConfiguration.YARN_ACL_ENABLE, true);
     csConf.setBoolean(YarnConfiguration.YARN_RESERVATION_ACL_ENABLE, true);
-    csConf.set("yarn.resourcemanager.scheduler.class", CapacityScheduler
-            .class.getName());
+    csConf.set(YarnConfiguration.RM_SCHEDULER,
+        CapacityScheduler.class.getName());
 
     return csConf;
   }
@@ -602,8 +602,7 @@ private static Configuration createFairSchedulerConfiguration() throws
     fsConf.setBoolean(YarnConfiguration.RM_RESERVATION_SYSTEM_ENABLE, true);
     fsConf.setBoolean(YarnConfiguration.YARN_ACL_ENABLE, true);
     fsConf.setBoolean(YarnConfiguration.YARN_RESERVATION_ACL_ENABLE, true);
-    fsConf.set("yarn.resourcemanager.scheduler.class", FairScheduler.class
-            .getName());
+    fsConf.set(YarnConfiguration.RM_SCHEDULER, FairScheduler.class.getName());
 
     return fsConf;
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestAppManager.java

@@ -80,6 +80,7 @@
 import org.apache.hadoop.yarn.util.Records;
 import org.apache.hadoop.yarn.util.resource.ResourceCalculator;
 import org.apache.hadoop.yarn.util.resource.Resources;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.PREFIX;
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
@@ -291,12 +292,11 @@ public void testQueueSubmitWithNoPermission() throws IOException {
     YarnConfiguration conf = new YarnConfiguration();
     conf.set(YarnConfiguration.RM_SCHEDULER,
         CapacityScheduler.class.getCanonicalName());
-    conf.set("yarn.scheduler.capacity.root.acl_submit_applications", " ");
-    conf.set("yarn.scheduler.capacity.root.acl_administer_queue", " ");
+    conf.set(PREFIX + "root.acl_submit_applications", " ");
+    conf.set(PREFIX + "root.acl_administer_queue", " ");
 
-    conf.set("yarn.scheduler.capacity.root.default.acl_submit_applications",
-        " ");
-    conf.set("yarn.scheduler.capacity.root.default.acl_administer_queue", " ");
+    conf.set(PREFIX + "root.default.acl_submit_applications", " ");
+    conf.set(PREFIX + "root.default.acl_administer_queue", " ");
     conf.set(YarnConfiguration.YARN_ACL_ENABLE, "true");
     MockRM mockRM = new MockRM(conf);
     ClientRMService rmService = mockRM.getClientRMService();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRM.java

@@ -69,6 +69,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptState;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.security.NMTokenSecretManagerInRM;
 import org.apache.log4j.Level;
 import org.apache.log4j.LogManager;
@@ -136,7 +137,7 @@ public void testAppWithNoContainers() throws Exception {
   public void testAppOnMultiNode() throws Exception {
     Logger rootLogger = LogManager.getRootLogger();
     rootLogger.setLevel(Level.DEBUG);
-    conf.set("yarn.scheduler.capacity.node-locality-delay", "-1");
+    conf.set(CapacitySchedulerConfiguration.NODE_LOCALITY_DELAY, "-1");
     MockRM rm = new MockRM(conf);
     rm.start();
     MockNM nm1 = rm.registerNode("h1:1234", 5120);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRMAdminService.java

@@ -68,6 +68,9 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration;
+import static org.apache.hadoop.yarn.conf.YarnConfiguration.RM_PROXY_USER_PREFIX;
+import static org.apache.hadoop.yarn.server.resourcemanager.resource.DynamicResourceConfiguration.NODES;
+import static org.apache.hadoop.yarn.server.resourcemanager.resource.DynamicResourceConfiguration.PREFIX;
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
@@ -165,7 +168,8 @@ public void testAdminRefreshQueuesWithFileSystemBasedConfigurationProvider()
 
     CapacitySchedulerConfiguration csConf =
         new CapacitySchedulerConfiguration();
-    csConf.set("yarn.scheduler.capacity.maximum-applications", "5000");
+    csConf.set(CapacitySchedulerConfiguration.MAXIMUM_SYSTEM_APPLICATIONS,
+        "5000");
     uploadConfiguration(csConf, "capacity-scheduler.xml");
 
     rm.adminService.refreshQueues(RefreshQueuesRequest.newInstance());
@@ -226,9 +230,9 @@ public void testRefreshNodesResourceWithFileSystemBasedConfigurationProvider()
 
     DynamicResourceConfiguration drConf =
         new DynamicResourceConfiguration();
-    drConf.set("yarn.resource.dynamic.nodes", "h1:1234");
-    drConf.set("yarn.resource.dynamic.h1:1234.vcores", "4");
-    drConf.set("yarn.resource.dynamic.h1:1234.memory", "4096");
+    drConf.set(PREFIX + NODES, "h1:1234");
+    drConf.set(PREFIX + "h1:1234.vcores", "4");
+    drConf.set(PREFIX + "h1:1234.memory", "4096");
     uploadConfiguration(drConf, "dynamic-resources.xml");
 
     rm.adminService.refreshNodesResources(
@@ -266,9 +270,9 @@ public void testRefreshNodesResourceWithResourceReturnInRegistration()
 
     DynamicResourceConfiguration drConf =
         new DynamicResourceConfiguration();
-    drConf.set("yarn.resource.dynamic.nodes", "h1:1234");
-    drConf.set("yarn.resource.dynamic.h1:1234.vcores", "4");
-    drConf.set("yarn.resource.dynamic.h1:1234.memory", "4096");
+    drConf.set(PREFIX + NODES, "h1:1234");
+    drConf.set(PREFIX + "h1:1234.vcores", "4");
+    drConf.set(PREFIX + "h1:1234.memory", "4096");
     uploadConfiguration(drConf, "dynamic-resources.xml");
 
     rm.adminService.refreshNodesResources(
@@ -316,9 +320,9 @@ public void testRefreshNodesResourceWithResourceReturnInHeartbeat()
 
     DynamicResourceConfiguration drConf =
         new DynamicResourceConfiguration();
-    drConf.set("yarn.resource.dynamic.nodes", "h1:1234");
-    drConf.set("yarn.resource.dynamic.h1:1234.vcores", "4");
-    drConf.set("yarn.resource.dynamic.h1:1234.memory", "4096");
+    drConf.set(PREFIX + NODES, "h1:1234");
+    drConf.set(PREFIX + "h1:1234.vcores", "4");
+    drConf.set(PREFIX + "h1:1234.memory", "4096");
     uploadConfiguration(drConf, "dynamic-resources.xml");
 
     rm.adminService.refreshNodesResources(
@@ -364,9 +368,9 @@ public void testResourcePersistentForNMRegistrationWithNewResource()
 
     DynamicResourceConfiguration drConf =
         new DynamicResourceConfiguration();
-    drConf.set("yarn.resource.dynamic.nodes", "h1:1234");
-    drConf.set("yarn.resource.dynamic.h1:1234.vcores", "4");
-    drConf.set("yarn.resource.dynamic.h1:1234.memory", "4096");
+    drConf.set(PREFIX + NODES, "h1:1234");
+    drConf.set(PREFIX + "h1:1234.vcores", "4");
+    drConf.set(PREFIX + "h1:1234.memory", "4096");
     uploadConfiguration(drConf, "dynamic-resources.xml");
 
     rm.adminService.refreshNodesResources(
@@ -611,8 +615,8 @@ private void verifyServiceACLsRefresh(ServiceAuthorizationManager manager,
         .get("hadoop.proxyuser.test.hosts").contains("test_hosts"));
 
     Configuration yarnConf = new Configuration(false);
-    yarnConf.set("yarn.resourcemanager.proxyuser.test.groups", "test_groups_1");
-    yarnConf.set("yarn.resourcemanager.proxyuser.test.hosts", "test_hosts_1");
+    yarnConf.set(RM_PROXY_USER_PREFIX + "test.groups", "test_groups_1");
+    yarnConf.set(RM_PROXY_USER_PREFIX + "test.hosts", "test_hosts_1");
     uploadConfiguration(yarnConf, "yarn-site.xml");
 
     // RM specific configs will overwrite the common ones
@@ -809,7 +813,8 @@ public void testRMHAWithFileSystemBasedConfiguration() throws IOException,
 
       CapacitySchedulerConfiguration csConf =
           new CapacitySchedulerConfiguration();
-      csConf.set("yarn.scheduler.capacity.maximum-applications", "5000");
+      csConf.set(CapacitySchedulerConfiguration.MAXIMUM_SYSTEM_APPLICATIONS,
+          "5000");
       uploadConfiguration(csConf, "capacity-scheduler.xml");
 
       rm1.adminService.refreshQueues(RefreshQueuesRequest.newInstance());
@@ -897,7 +902,8 @@ public void testRMInitialsWithFileSystemBasedConfigurationProvider()
 
     CapacitySchedulerConfiguration csConf =
         new CapacitySchedulerConfiguration();
-    csConf.set("yarn.scheduler.capacity.maximum-applications", "5000");
+    csConf.set(CapacitySchedulerConfiguration.MAXIMUM_SYSTEM_APPLICATIONS,
+        "5000");
     uploadConfiguration(csConf, "capacity-scheduler.xml");
 
     String aclsString = "alice,bob users,wheel";

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRMProxyUsersConf.java

@@ -26,6 +26,7 @@
 import org.apache.hadoop.security.authorize.AuthorizationException;
 import org.apache.hadoop.security.authorize.ProxyUsers;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import static org.apache.hadoop.yarn.conf.YarnConfiguration.RM_PROXY_USER_PREFIX;
 import org.junit.Assert;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -50,30 +51,30 @@ public static Collection<Object[]> headers() {
   public TestRMProxyUsersConf(int round) {
     conf = new YarnConfiguration();
     switch (round) {
-      case 0:
-        // hadoop.proxyuser prefix
-        conf.set("hadoop.proxyuser.foo.hosts", ipAddress);
-        conf.set("hadoop.proxyuser.foo.users", "bar");
-        conf.set("hadoop.proxyuser.foo.groups", "bar_group");
-        break;
-      case 1:
-        // yarn.resourcemanager.proxyuser prefix
-        conf.set("yarn.resourcemanager.proxyuser.foo.hosts", ipAddress);
-        conf.set("yarn.resourcemanager.proxyuser.foo.users", "bar");
-        conf.set("yarn.resourcemanager.proxyuser.foo.groups", "bar_group");
-        break;
-      case 2:
-        // hadoop.proxyuser prefix has been overwritten by
-        // yarn.resourcemanager.proxyuser prefix
-        conf.set("hadoop.proxyuser.foo.hosts", "xyz");
-        conf.set("hadoop.proxyuser.foo.users", "xyz");
-        conf.set("hadoop.proxyuser.foo.groups", "xyz");
-        conf.set("yarn.resourcemanager.proxyuser.foo.hosts", ipAddress);
-        conf.set("yarn.resourcemanager.proxyuser.foo.users", "bar");
-        conf.set("yarn.resourcemanager.proxyuser.foo.groups", "bar_group");
-        break;
-      default:
-        break;
+    case 0:
+      // hadoop.proxyuser prefix
+      conf.set("hadoop.proxyuser.foo.hosts", ipAddress);
+      conf.set("hadoop.proxyuser.foo.users", "bar");
+      conf.set("hadoop.proxyuser.foo.groups", "bar_group");
+      break;
+    case 1:
+      // yarn.resourcemanager.proxyuser prefix
+      conf.set(RM_PROXY_USER_PREFIX + "foo.hosts", ipAddress);
+      conf.set(RM_PROXY_USER_PREFIX + "foo.users", "bar");
+      conf.set(RM_PROXY_USER_PREFIX + "foo.groups", "bar_group");
+      break;
+    case 2:
+      // hadoop.proxyuser prefix has been overwritten by
+      // yarn.resourcemanager.proxyuser prefix
+      conf.set("hadoop.proxyuser.foo.hosts", "xyz");
+      conf.set("hadoop.proxyuser.foo.users", "xyz");
+      conf.set("hadoop.proxyuser.foo.groups", "xyz");
+      conf.set(RM_PROXY_USER_PREFIX + "foo.hosts", ipAddress);
+      conf.set(RM_PROXY_USER_PREFIX + "foo.users", "bar");
+      conf.set(RM_PROXY_USER_PREFIX + "foo.groups", "bar_group");
+      break;
+    default:
+      break;
     }
   }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestWorkPreservingRMRestart.java

@@ -94,6 +94,7 @@
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.PREFIX;
 
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.mock;
@@ -644,7 +645,7 @@ public void testCapacitySchedulerRecovery() throws Exception {
     rm1.clearQueueMetrics(app1_2);
     rm1.clearQueueMetrics(app2);
 
-    csConf.set("yarn.scheduler.capacity.root.Default.QueueB.state", "STOPPED");
+    csConf.set(PREFIX + "root.Default.QueueB.state", "STOPPED");
 
     // Re-start RM
     rm2 = new MockRM(csConf, memStore);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/ahs/TestRMApplicationHistoryWriter.java

@@ -389,10 +389,9 @@ private void testRMWritingMassiveHistory(boolean isFS) throws Exception {
     YarnConfiguration conf = new YarnConfiguration();
     if (isFS) {
       conf.setBoolean(FairSchedulerConfiguration.ASSIGN_MULTIPLE, true);
-      conf.set("yarn.resourcemanager.scheduler.class",
-          FairScheduler.class.getName());
+      conf.set(YarnConfiguration.RM_SCHEDULER, FairScheduler.class.getName());
     } else {
-      conf.set("yarn.resourcemanager.scheduler.class",
+      conf.set(YarnConfiguration.RM_SCHEDULER,
           CapacityScheduler.class.getName());
     }
     // don't process history events

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/capacity/TestProportionalCapacityPreemptionPolicy.java

@@ -157,8 +157,7 @@ public void setup() {
     conf.setBoolean(YarnConfiguration.RM_SCHEDULER_ENABLE_MONITORS, true);
     // FairScheduler doesn't support this test,
     // Set CapacityScheduler as the scheduler for this test.
-    conf.set("yarn.resourcemanager.scheduler.class",
-        CapacityScheduler.class.getName());
+    conf.set(YarnConfiguration.RM_SCHEDULER, CapacityScheduler.class.getName());
 
     mClock = mock(Clock.class);
     mCS = mock(CapacityScheduler.class);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestApplicationLimits.java

@@ -60,6 +60,7 @@
 import org.apache.hadoop.yarn.util.resource.DefaultResourceCalculator;
 import org.apache.hadoop.yarn.util.resource.ResourceCalculator;
 import org.apache.hadoop.yarn.util.resource.Resources;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.PREFIX;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -339,11 +340,8 @@ public void testLimitsComputation() throws Exception {
             );
 
     // Change the per-queue max AM resources percentage.
-    csConf.setFloat(
-      "yarn.scheduler.capacity." + 
-          queue.getQueuePath() + 
-          ".maximum-am-resource-percent",
-      0.5f);
+    csConf.setFloat(PREFIX + queue.getQueuePath()
+        + ".maximum-am-resource-percent", 0.5f);
     // Re-create queues to get new configs.
     queues = new HashMap<String, CSQueue>();
     root = 
@@ -364,10 +362,8 @@ public void testLimitsComputation() throws Exception {
       Resource.newInstance(400*GB, 1));
 
     // Change the per-queue max applications.
-    csConf.setInt(
-      "yarn.scheduler.capacity." + 
-          queue.getQueuePath() + 
-          ".maximum-applications", 9999);
+    csConf.setInt(PREFIX + queue.getQueuePath() + ".maximum-applications",
+        9999);
     // Re-create queues to get new configs.
     queues = new HashMap<String, CSQueue>();
     root = 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestCapacitySchedulerQueueACLs.java

@@ -66,7 +66,8 @@ protected Configuration createConfiguration() {
     csConf.setAcls(CapacitySchedulerConfiguration.ROOT, aclsOnRootQueue);
 
     csConf.setBoolean(YarnConfiguration.YARN_ACL_ENABLE, true);
-    csConf.set("yarn.resourcemanager.scheduler.class", CapacityScheduler.class.getName());
+    csConf.set(YarnConfiguration.RM_SCHEDULER,
+        CapacityScheduler.class.getName());
 
     return csConf;
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestLeafQueue.java

@@ -154,9 +154,9 @@ private void setUpInternal(ResourceCalculator rC) throws Exception {
     
     csConf = 
         new CapacitySchedulerConfiguration();
-    csConf.setBoolean("yarn.scheduler.capacity.user-metrics.enable", true);
-    csConf.setBoolean(
-        "yarn.scheduler.capacity.reservations-continue-look-all-nodes", false);
+    csConf.setBoolean(CapacitySchedulerConfiguration.ENABLE_USER_METRICS, true);
+    csConf.setBoolean(CapacitySchedulerConfiguration.RESERVE_CONT_LOOK_ALL_NODES,
+        false);
     final String newRoot = "root" + System.currentTimeMillis();
     setupQueueConfiguration(csConf, newRoot);
     YarnConfiguration conf = new YarnConfiguration();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestReservations.java

@@ -112,7 +112,7 @@ private void setup(CapacitySchedulerConfiguration csConf) throws Exception {
   private void setup(CapacitySchedulerConfiguration csConf,
       boolean addUserLimits) throws Exception {
 
-    csConf.setBoolean("yarn.scheduler.capacity.user-metrics.enable", true);
+    csConf.setBoolean(CapacitySchedulerConfiguration.ENABLE_USER_METRICS, true);
     final String newRoot = "root" + System.currentTimeMillis();
     // final String newRoot = "root";
 
@@ -502,8 +502,8 @@ public void testReservationNoContinueLook() throws Exception {
     queues = new HashMap<String, CSQueue>();
     // test that the deadlock occurs when turned off
     CapacitySchedulerConfiguration csConf = new CapacitySchedulerConfiguration();
-    csConf.setBoolean(
-        "yarn.scheduler.capacity.reservations-continue-look-all-nodes", false);
+    csConf.setBoolean(CapacitySchedulerConfiguration.RESERVE_CONT_LOOK_ALL_NODES,
+        false);
     setup(csConf);
 
     // Manipulate queue 'a'

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFairSchedulerEventLog.java

@@ -45,7 +45,7 @@ public void setUp() throws IOException {
     Configuration conf = new YarnConfiguration();
     conf.setClass(YarnConfiguration.RM_SCHEDULER, FairScheduler.class,
         ResourceScheduler.class);
-    conf.set("yarn.scheduler.fair.event-log-enabled", "true");
+    conf.set(FairSchedulerConfiguration.EVENT_LOG_ENABLED, "true");
 
     // All tests assume only one assignment per node update
     conf.set(FairSchedulerConfiguration.ASSIGN_MULTIPLE, "false");

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFairSchedulerQueueACLs.java

@@ -55,7 +55,7 @@ protected Configuration createConfiguration() throws IOException {
     fsConf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
 
     fsConf.setBoolean(YarnConfiguration.YARN_ACL_ENABLE, true);
-    fsConf.set("yarn.resourcemanager.scheduler.class", FairScheduler.class.getName());
+    fsConf.set(YarnConfiguration.RM_SCHEDULER, FairScheduler.class.getName());
 
     return fsConf;
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesAppsModification.java

@@ -189,7 +189,7 @@ protected void configureServlets() {
   private class CapTestServletModule extends TestServletModule {
     @Override
     public void configureScheduler() {
-      conf.set("yarn.resourcemanager.scheduler.class",
+      conf.set(YarnConfiguration.RM_SCHEDULER,
           CapacityScheduler.class.getName());
     }
   }
@@ -215,8 +215,7 @@ public void configureScheduler() {
       } catch(IOException e) {
       }
       conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, FS_ALLOC_FILE);
-      conf.set("yarn.resourcemanager.scheduler.class",
-          FairScheduler.class.getName());
+      conf.set(YarnConfiguration.RM_SCHEDULER, FairScheduler.class.getName());
     }
   }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesDelegationTokenAuthentication.java

@@ -58,7 +58,6 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ApplicationSubmissionContextInfo;
-import org.apache.hadoop.yarn.util.ConverterUtils;
 import org.codehaus.jettison.json.JSONObject;
 import org.junit.AfterClass;
 import org.junit.Assert;
@@ -66,6 +65,7 @@
 import org.junit.Test;
 
 import com.sun.jersey.api.client.ClientResponse.Status;
+import static org.apache.hadoop.yarn.conf.YarnConfiguration.RM_PROXY_USER_PREFIX;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
 
@@ -159,8 +159,8 @@ private static void setupAndStartRM() throws Exception {
     rmconf.set(YarnConfiguration.NM_WEBAPP_SPNEGO_KEYTAB_FILE_KEY,
       httpSpnegoKeytabFile.getAbsolutePath());
     rmconf.setBoolean("mockrm.webapp.enabled", true);
-    rmconf.set("yarn.resourcemanager.proxyuser.client.hosts", "*");
-    rmconf.set("yarn.resourcemanager.proxyuser.client.groups", "*");
+    rmconf.set(RM_PROXY_USER_PREFIX + "client.hosts", "*");
+    rmconf.set(RM_PROXY_USER_PREFIX + "client.groups", "*");
     UserGroupInformation.setConfiguration(rmconf);
     rm = new MockRM(rmconf);
     rm.start();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesHttpStaticUserPermissions.java

@@ -104,8 +104,8 @@ private static void setupAndStartRM() throws Exception {
     rmconf.setBoolean(YarnConfiguration.YARN_ACL_ENABLE, true);
     rmconf.set(CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHENTICATION,
       "kerberos");
-    rmconf.set("yarn.resourcemanager.principal", spnegoPrincipal);
-    rmconf.set("yarn.resourcemanager.keytab",
+    rmconf.set(YarnConfiguration.RM_PRINCIPAL, spnegoPrincipal);
+    rmconf.set(YarnConfiguration.RM_KEYTAB,
         spnegoKeytabFile.getAbsolutePath());
     rmconf.setBoolean("mockrm.webapp.enabled", true);
     UserGroupInformation.setConfiguration(rmconf);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesReservation.java

@@ -170,7 +170,7 @@ protected void configureServlets() {
   private static class CapTestServletModule extends TestServletModule {
     @Override
     public void configureScheduler() {
-      conf.set("yarn.resourcemanager.scheduler.class",
+      conf.set(YarnConfiguration.RM_SCHEDULER,
           CapacityScheduler.class.getName());
     }
   }
@@ -196,8 +196,7 @@ public void configureScheduler() {
       } catch (IOException e) {
       }
       conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, FS_ALLOC_FILE);
-      conf.set("yarn.resourcemanager.scheduler.class",
-          FairScheduler.class.getName());
+      conf.set(YarnConfiguration.RM_SCHEDULER, FairScheduler.class.getName());
     }
   }