YARN-11320. [Federation] Add getSchedulerInfo REST APIs for Router.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/CapacitySchedulerInfo.java

@@ -121,6 +121,7 @@ public CapacitySchedulerInfo(CSQueue parent, CapacityScheduler cs) {
         .getAutoCreationEligibility(parent);
 
     defaultNodeLabelExpression = parent.getDefaultNodeLabelExpression();
+    schedulerName = "Capacity Scheduler";
   }
 
   public float getCapacity() {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/FairSchedulerInfo.java

@@ -45,6 +45,7 @@ public FairSchedulerInfo(FairScheduler fs) {
     scheduler = fs;
     rootQueue = new FairSchedulerQueueInfo(scheduler.getQueueManager().
         getRootQueue(), scheduler);
+    schedulerName = "Fair Scheduler";
   }
 
   /**

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/FifoSchedulerInfo.java

@@ -84,6 +84,8 @@ public FifoSchedulerInfo(final ResourceManager rm) {
       this.totalNodeCapacity += ni.getTotalCapability().getMemorySize();
       this.numContainers += fs.getNodeReport(ni.getNodeID()).getNumContainers();
     }
+
+    this.schedulerName = "Fifo Scheduler";
   }
 
   public int getNumNodes() {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/SchedulerTypeInfo.java

@@ -25,7 +25,8 @@
 @XmlRootElement(name = "scheduler")
 @XmlAccessorType(XmlAccessType.FIELD)
 public class SchedulerTypeInfo {
-  protected SchedulerInfo schedulerInfo;
+  private SchedulerInfo schedulerInfo;
+  private String subClusterId;
 
   public SchedulerTypeInfo() {
   } // JAXB needs this
@@ -37,4 +38,12 @@ public SchedulerTypeInfo(final SchedulerInfo scheduler) {
   public SchedulerInfo getSchedulerInfo() {
     return schedulerInfo;
   }
+
+  public String getSubClusterId() {
+    return subClusterId;
+  }
+
+  public void setSubClusterId(String subClusterId) {
+    this.subClusterId = subClusterId;
+  }
 }

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

@@ -172,7 +172,7 @@ public boolean attemptExists(RMAppAttempt attempt) throws IOException {
     }
   }
 
-  @Test(timeout = 60000)
+  @Test(timeout = 120000)
   public void testFSRMStateStore() throws Exception {
     HdfsConfiguration conf = new HdfsConfiguration();
     MiniDFSCluster cluster =

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/RouterMetrics.java

@@ -135,6 +135,8 @@ public final class RouterMetrics {
   private MutableGaugeInt numRenewDelegationTokenFailedRetrieved;
   @Metric("# of renewDelegationToken failed to be retrieved")
   private MutableGaugeInt numCancelDelegationTokenFailedRetrieved;
+  @Metric("# of getSchedulerInfo failed to be retrieved")
+  private MutableGaugeInt numGetSchedulerInfoFailedRetrieved;
   @Metric("# of refreshSuperUserGroupsConfiguration failed to be retrieved")
   private MutableGaugeInt numRefreshSuperUserGroupsConfigurationFailedRetrieved;
   @Metric("# of refreshUserToGroupsMappings failed to be retrieved")
@@ -240,6 +242,9 @@ public final class RouterMetrics {
   @Metric("Total number of successful Retrieved RefreshUserToGroupsMappings and latency(ms)")
   private MutableRate totalSucceededRefreshUserToGroupsMappingsRetrieved;
 
+  @Metric("Total number of successful Retrieved GetSchedulerInfo and latency(ms)")
+  private MutableRate totalSucceededGetSchedulerInfoRetrieved;
+
   /**
    * Provide quantile counters for all latencies.
    */
@@ -290,6 +295,7 @@ public final class RouterMetrics {
   private MutableQuantiles getDelegationTokenLatency;
   private MutableQuantiles renewDelegationTokenLatency;
   private MutableQuantiles cancelDelegationTokenLatency;
+  private MutableQuantiles getSchedulerInfoRetrievedLatency;
   private MutableQuantiles refreshSuperUserGroupsConfLatency;
   private MutableQuantiles refreshUserToGroupsMappingsLatency;
 
@@ -466,6 +472,9 @@ private RouterMetrics() {
     cancelDelegationTokenLatency = registry.newQuantiles("cancelDelegationTokenLatency",
         "latency of cancel delegation token timeouts", "ops", "latency", 10);
 
+    getSchedulerInfoRetrievedLatency = registry.newQuantiles("getSchedulerInfoRetrievedLatency",
+        "latency of get scheduler info timeouts", "ops", "latency", 10);
+
     refreshSuperUserGroupsConfLatency = registry.newQuantiles("refreshSuperUserGroupsConfLatency",
         "latency of refresh superuser groups configuration timeouts", "ops", "latency", 10);
 
@@ -727,6 +736,11 @@ public long getNumSucceededCancelDelegationTokenRetrieved() {
     return totalSucceededCancelDelegationTokenRetrieved.lastStat().numSamples();
   }
 
+  @VisibleForTesting
+  public long getNumSucceededGetSchedulerInfoRetrieved() {
+    return totalSucceededGetSchedulerInfoRetrieved.lastStat().numSamples();
+  }
+
   @VisibleForTesting
   public long getNumSucceededRefreshSuperUserGroupsConfigurationRetrieved() {
     return totalSucceededRefreshSuperUserGroupsConfigurationRetrieved.lastStat().numSamples();
@@ -967,6 +981,11 @@ public double getLatencySucceededCancelDelegationTokenRetrieved() {
     return totalSucceededCancelDelegationTokenRetrieved.lastStat().mean();
   }
 
+  @VisibleForTesting
+  public double getLatencySucceededGetSchedulerInfoRetrieved() {
+    return totalSucceededGetSchedulerInfoRetrieved.lastStat().mean();
+  }
+
   @VisibleForTesting
   public double getLatencySucceededRefreshSuperUserGroupsConfigurationRetrieved() {
     return totalSucceededRefreshSuperUserGroupsConfigurationRetrieved.lastStat().mean();
@@ -1190,6 +1209,10 @@ public int getCancelDelegationTokenFailedRetrieved() {
     return numCancelDelegationTokenFailedRetrieved.value();
   }
 
+  public int getSchedulerInfoFailedRetrieved() {
+    return numGetSchedulerInfoFailedRetrieved.value();
+  }
+
   public void succeededAppsCreated(long duration) {
     totalSucceededAppsCreated.add(duration);
     getNewApplicationLatency.add(duration);
@@ -1425,6 +1448,11 @@ public void succeededCancelDelegationTokenRetrieved(long duration) {
     cancelDelegationTokenLatency.add(duration);
   }
 
+  public void succeededGetSchedulerInfoRetrieved(long duration) {
+    totalSucceededGetSchedulerInfoRetrieved.add(duration);
+    getSchedulerInfoRetrievedLatency.add(duration);
+  }
+
   public void succeededRefreshSuperUserGroupsConfRetrieved(long duration) {
     totalSucceededRefreshSuperUserGroupsConfigurationRetrieved.add(duration);
     refreshSuperUserGroupsConfLatency.add(duration);
@@ -1630,4 +1658,8 @@ public void incrRenewDelegationTokenFailedRetrieved() {
   public void incrCancelDelegationTokenFailedRetrieved() {
     numCancelDelegationTokenFailedRetrieved.incr();
   }
+
+  public void incrGetSchedulerInfoFailedRetrieved() {
+    numGetSchedulerInfoFailedRetrieved.incr();
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/webapp/FederationInterceptorREST.java

@@ -82,6 +82,7 @@
 import org.apache.hadoop.yarn.server.federation.store.records.SubClusterInfo;
 import org.apache.hadoop.yarn.server.federation.utils.FederationStateStoreFacade;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.NodeIDsInfo;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.RMWSConsts;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.RMWebAppUtil;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ActivitiesInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.AppActivitiesInfo;
@@ -122,6 +123,7 @@
 import org.apache.hadoop.yarn.server.router.security.RouterDelegationTokenSecretManager;
 import org.apache.hadoop.yarn.server.router.webapp.cache.RouterAppInfoCacheKey;
 import org.apache.hadoop.yarn.server.router.webapp.dao.FederationRMQueueAclInfo;
+import org.apache.hadoop.yarn.server.router.webapp.dao.FederationSchedulerTypeInfo;
 import org.apache.hadoop.yarn.server.utils.BuilderUtils;
 import org.apache.hadoop.yarn.server.webapp.dao.AppAttemptInfo;
 import org.apache.hadoop.yarn.server.webapp.dao.ContainerInfo;
@@ -1140,9 +1142,43 @@ public ClusterUserInfo getClusterUserInfo(HttpServletRequest hsr) {
     throw new NotImplementedException("Code is not implemented");
   }
 
+  /**
+   * This method retrieves the current scheduler status, and it is reachable by
+   * using {@link RMWSConsts#SCHEDULER}.
+   *
+   * For the federation mode, the SchedulerType information of the cluster
+   * cannot be integrated and displayed, and the specific cluster information needs to be marked.
+   *
+   * @return the current scheduler status
+   */
   @Override
   public SchedulerTypeInfo getSchedulerInfo() {
-    throw new NotImplementedException("Code is not implemented");
+    try {
+      long startTime = Time.now();
+      Map<SubClusterId, SubClusterInfo> subClustersActive = getActiveSubclusters();
+      Class[] argsClasses = new Class[]{};
+      Object[] args = new Object[]{};
+      ClientMethod remoteMethod = new ClientMethod("getSchedulerInfo", argsClasses, args);
+      Map<SubClusterInfo, SchedulerTypeInfo> subClusterInfoMap =
+          invokeConcurrent(subClustersActive.values(), remoteMethod, SchedulerTypeInfo.class);
+      FederationSchedulerTypeInfo federationSchedulerTypeInfo = new FederationSchedulerTypeInfo();
+      subClusterInfoMap.forEach((subClusterInfo, schedulerTypeInfo) -> {
+        SubClusterId subClusterId = subClusterInfo.getSubClusterId();
+        schedulerTypeInfo.setSubClusterId(subClusterId.getId());
+        federationSchedulerTypeInfo.getList().add(schedulerTypeInfo);
+      });
+      long stopTime = Time.now();
+      routerMetrics.succeededGetSchedulerInfoRetrieved(stopTime - startTime);
+      return federationSchedulerTypeInfo;
+    } catch (NotFoundException e) {
+      routerMetrics.incrGetSchedulerInfoFailedRetrieved();
+      RouterServerUtil.logAndThrowRunTimeException("Get all active sub cluster(s) error.", e);
+    } catch (YarnException | IOException e) {
+      routerMetrics.incrGetSchedulerInfoFailedRetrieved();
+      RouterServerUtil.logAndThrowRunTimeException("getSchedulerInfo error.", e);
+    }
+    routerMetrics.incrGetSchedulerInfoFailedRetrieved();
+    throw new RuntimeException("getSchedulerInfo error.");
   }
 
   @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/webapp/dao/FederationSchedulerTypeInfo.java

@@ -0,0 +1,49 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.yarn.server.router.webapp.dao;
+
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.SchedulerTypeInfo;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import java.util.ArrayList;
+import java.util.List;
+
+@XmlRootElement
+@XmlAccessorType(XmlAccessType.FIELD)
+public class FederationSchedulerTypeInfo extends SchedulerTypeInfo {
+  @XmlElement(name = "subCluster")
+  private List<SchedulerTypeInfo> list = new ArrayList<>();
+
+  public FederationSchedulerTypeInfo() {
+  } // JAXB needs this
+
+  public FederationSchedulerTypeInfo(ArrayList<SchedulerTypeInfo> list) {
+    this.list = list;
+  }
+
+  public List<SchedulerTypeInfo> getList() {
+    return list;
+  }
+
+  public void setList(List<SchedulerTypeInfo> list) {
+    this.list = list;
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/test/java/org/apache/hadoop/yarn/server/router/webapp/MockDefaultRequestInterceptorREST.java

@@ -100,6 +100,8 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestUtils;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CSQueue;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerTestUtilities;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.NodeIDsInfo;
@@ -138,6 +140,9 @@
 import org.apache.hadoop.yarn.server.router.RouterServerUtil;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.PartitionInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.RMQueueAclInfo;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.SchedulerTypeInfo;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.SchedulerInfo;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerInfo;
 import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
 import org.apache.hadoop.yarn.server.webapp.dao.AppAttemptInfo;
 import org.apache.hadoop.yarn.server.webapp.dao.ContainerInfo;
@@ -1206,4 +1211,17 @@ public RMQueueAclInfo checkUserAccessToQueue(
       return new RMQueueAclInfo(true, user.getUserName(), "");
     }
   }
+
+  @Override
+  public SchedulerTypeInfo getSchedulerInfo() {
+    try {
+      ResourceManager resourceManager = CapacitySchedulerTestUtilities.createResourceManager();
+      CapacityScheduler cs = (CapacityScheduler) resourceManager.getResourceScheduler();
+      CSQueue root = cs.getRootQueue();
+      SchedulerInfo schedulerInfo = new CapacitySchedulerInfo(root, cs);
+      return new SchedulerTypeInfo(schedulerInfo);
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/test/java/org/apache/hadoop/yarn/server/router/webapp/TestFederationInterceptorREST.java

@@ -27,6 +27,7 @@
 import java.util.Set;
 import java.util.HashSet;
 import java.util.Collections;
+import java.util.stream.Collectors;
 import java.util.concurrent.TimeUnit;
 
 import javax.servlet.http.HttpServletRequest;
@@ -37,6 +38,7 @@
 import org.apache.hadoop.test.LambdaTestUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.http.HttpConfig;
+import org.apache.hadoop.util.Lists;
 import org.apache.hadoop.util.Time;
 import org.apache.hadoop.yarn.api.protocolrecords.ReservationSubmissionRequest;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
@@ -105,12 +107,18 @@
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ReservationDefinitionInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ReservationRequestsInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ReservationRequestInfo;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.SchedulerTypeInfo;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.SchedulerInfo;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerInfo;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerQueueInfoList;
+import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerQueueInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.NewReservation;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ReservationUpdateRequestInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ReservationDeleteRequestInfo;
 import org.apache.hadoop.yarn.server.webapp.dao.ContainerInfo;
 import org.apache.hadoop.yarn.server.webapp.dao.ContainersInfo;
 import org.apache.hadoop.yarn.server.router.webapp.dao.FederationRMQueueAclInfo;
+import org.apache.hadoop.yarn.server.router.webapp.dao.FederationSchedulerTypeInfo;
 import org.apache.hadoop.yarn.util.LRUCacheHashMap;
 import org.apache.hadoop.yarn.util.MonotonicClock;
 import org.apache.hadoop.yarn.util.Times;
@@ -1526,6 +1534,64 @@ public void testCheckFederationInterceptorRESTClient() {
     Assert.assertEquals(webAppAddress, interceptorREST.getWebAppAddress());
   }
 
+  @Test
+  public void testGetSchedulerInfo() {
+    // In this test case, we will get the return results of 4 sub-clusters.
+    SchedulerTypeInfo typeInfo = interceptor.getSchedulerInfo();
+    Assert.assertNotNull(typeInfo);
+    Assert.assertTrue(typeInfo instanceof FederationSchedulerTypeInfo);
+
+    FederationSchedulerTypeInfo federationSchedulerTypeInfo =
+        FederationSchedulerTypeInfo.class.cast(typeInfo);
+    Assert.assertNotNull(federationSchedulerTypeInfo);
+    List<SchedulerTypeInfo> schedulerTypeInfos = federationSchedulerTypeInfo.getList();
+    Assert.assertNotNull(schedulerTypeInfos);
+    Assert.assertEquals(4, schedulerTypeInfos.size());
+    List<String> subClusterIds =
+        subClusters.stream().map(subClusterId -> subClusterId.getId()).
+        collect(Collectors.toList());
+
+    for (SchedulerTypeInfo schedulerTypeInfo : schedulerTypeInfos) {
+      Assert.assertNotNull(schedulerTypeInfo);
+
+      // 1. Whether the returned subClusterId is in the subCluster list
+      String subClusterId = schedulerTypeInfo.getSubClusterId();
+      Assert.assertTrue(subClusterIds.contains(subClusterId));
+
+      // 2. We test CapacityScheduler, the returned type should be CapacityScheduler.
+      SchedulerInfo schedulerInfo = schedulerTypeInfo.getSchedulerInfo();
+      Assert.assertNotNull(schedulerInfo);
+      Assert.assertTrue(schedulerInfo instanceof CapacitySchedulerInfo);
+      CapacitySchedulerInfo capacitySchedulerInfo =
+          CapacitySchedulerInfo.class.cast(schedulerInfo);
+      Assert.assertNotNull(capacitySchedulerInfo);
+
+      // 3. The parent queue name should be root
+      String queueName = capacitySchedulerInfo.getQueueName();
+      Assert.assertEquals("root", queueName);
+
+      // 4. schedulerType should be CapacityScheduler
+      String schedulerType = capacitySchedulerInfo.getSchedulerType();
+      Assert.assertEquals("Capacity Scheduler", schedulerType);
+
+      // 5. queue path should be root
+      String queuePath = capacitySchedulerInfo.getQueuePath();
+      Assert.assertEquals("root", queuePath);
+
+      // 6. mockRM has 2 test queues, [root.a, root.b]
+      List<String> queues = Lists.newArrayList("root.a", "root.b");
+      CapacitySchedulerQueueInfoList csSchedulerQueueInfoList = capacitySchedulerInfo.getQueues();
+      Assert.assertNotNull(csSchedulerQueueInfoList);
+      List<CapacitySchedulerQueueInfo> csQueueInfoList =
+          csSchedulerQueueInfoList.getQueueInfoList();
+      Assert.assertEquals(2, csQueueInfoList.size());
+      for (CapacitySchedulerQueueInfo csQueueInfo : csQueueInfoList) {
+        Assert.assertNotNull(csQueueInfo);
+        Assert.assertTrue(queues.contains(csQueueInfo.getQueuePath()));
+      }
+    }
+  }
+
   @Test
   public void testPostDelegationTokenErrorHsr() throws Exception {
     // Prepare delegationToken data