YARN-11446. [Federation] Add updateSchedulerConfiguration, getSchedulerConfiguration REST APIs for Router. (#5476)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/dao/ConfInfo.java

@@ -33,6 +33,8 @@ public class ConfInfo {
 
   private ArrayList<ConfItem> property = new ArrayList<>();
 
+  private String subClusterId;
+
   public ConfInfo() {
   } // JAXB needs this
 
@@ -74,5 +76,14 @@ public String getKey() {
     public String getValue() {
       return value;
     }
+
+  }
+
+  public String getSubClusterId() {
+    return subClusterId;
+  }
+
+  public void setSubClusterId(String subClusterId) {
+    this.subClusterId = subClusterId;
   }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/dao/SchedConfUpdateInfo.java

@@ -44,6 +44,9 @@ public class SchedConfUpdateInfo {
   @XmlElement(name = "update-queue")
   private ArrayList<QueueConfigInfo> updateQueueInfo = new ArrayList<>();
 
+  @XmlElement(name = "subClusterId")
+  private String subClusterId = "";
+
   private HashMap<String, String> global = new HashMap<>();
 
   public SchedConfUpdateInfo() {
@@ -82,4 +85,12 @@ public HashMap<String, String> getGlobalParams() {
   public void setGlobalParams(HashMap<String, String> globalInfo) {
     this.global = globalInfo;
   }
+
+  public String getSubClusterId() {
+    return subClusterId;
+  }
+
+  public void setSubClusterId(String subClusterId) {
+    this.subClusterId = subClusterId;
+  }
 }

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

@@ -159,6 +159,10 @@ public final class RouterMetrics {
   private MutableGaugeInt numAddToClusterNodeLabelsFailedRetrieved;
   @Metric("# of removeFromClusterNodeLabels failed to be retrieved")
   private MutableGaugeInt numRemoveFromClusterNodeLabelsFailedRetrieved;
+  @Metric("# of numUpdateSchedulerConfiguration failed to be retrieved")
+  private MutableGaugeInt numUpdateSchedulerConfigurationFailedRetrieved;
+  @Metric("# of numGetSchedulerConfiguration failed to be retrieved")
+  private MutableGaugeInt numGetSchedulerConfigurationFailedRetrieved;
   @Metric("# of getClusterInfo failed to be retrieved")
   private MutableGaugeInt numGetClusterInfoFailedRetrieved;
   @Metric("# of getClusterUserInfo failed to be retrieved")
@@ -287,6 +291,10 @@ public final class RouterMetrics {
   private MutableRate totalSucceededAddToClusterNodeLabelsRetrieved;
   @Metric("Total number of successful Retrieved RemoveFromClusterNodeLabels and latency(ms)")
   private MutableRate totalSucceededRemoveFromClusterNodeLabelsRetrieved;
+  @Metric("Total number of successful Retrieved updateSchedulerConfiguration and latency(ms)")
+  private MutableRate totalSucceededUpdateSchedulerConfigurationRetrieved;
+  @Metric("Total number of successful Retrieved getSchedulerConfiguration and latency(ms)")
+  private MutableRate totalSucceededGetSchedulerConfigurationRetrieved;
   @Metric("Total number of successful Retrieved GetClusterInfoRetrieved and latency(ms)")
   private MutableRate totalSucceededGetClusterInfoRetrieved;
   @Metric("Total number of successful Retrieved GetClusterUserInfoRetrieved and latency(ms)")
@@ -358,6 +366,8 @@ public final class RouterMetrics {
   private MutableQuantiles replaceLabelsOnNodeLatency;
   private MutableQuantiles addToClusterNodeLabelsLatency;
   private MutableQuantiles removeFromClusterNodeLabelsLatency;
+  private MutableQuantiles updateSchedulerConfigLatency;
+  private MutableQuantiles getSchedulerConfigurationLatency;
   private MutableQuantiles getClusterInfoLatency;
   private MutableQuantiles getClusterUserInfoLatency;
   private MutableQuantiles updateNodeResourceLatency;
@@ -572,6 +582,12 @@ private RouterMetrics() {
     removeFromClusterNodeLabelsLatency = registry.newQuantiles("removeFromClusterNodeLabelsLatency",
         "latency of remove cluster nodelabels timeouts", "ops", "latency", 10);
 
+    updateSchedulerConfigLatency = registry.newQuantiles("updateSchedulerConfigurationLatency",
+        "latency of update scheduler configuration timeouts", "ops", "latency", 10);
+
+    getSchedulerConfigurationLatency = registry.newQuantiles("getSchedulerConfigurationLatency",
+        "latency of get scheduler configuration timeouts", "ops", "latency", 10);
+
     getClusterInfoLatency = registry.newQuantiles("getClusterInfoLatency",
         "latency of get cluster info timeouts", "ops", "latency", 10);
 
@@ -879,6 +895,16 @@ public long getNumSucceededRemoveFromClusterNodeLabelsRetrieved() {
     return totalSucceededRemoveFromClusterNodeLabelsRetrieved.lastStat().numSamples();
   }
 
+  @VisibleForTesting
+  public long getNumSucceededUpdateSchedulerConfigurationRetrieved() {
+    return totalSucceededUpdateSchedulerConfigurationRetrieved.lastStat().numSamples();
+  }
+
+  @VisibleForTesting
+  public long getNumSucceededGetSchedulerConfigurationRetrieved() {
+    return totalSucceededGetSchedulerConfigurationRetrieved.lastStat().numSamples();
+  }
+
   @VisibleForTesting
   public long getNumSucceededGetClusterInfoRetrieved() {
     return totalSucceededGetClusterInfoRetrieved.lastStat().numSamples();
@@ -1189,6 +1215,16 @@ public double getLatencySucceededRemoveFromClusterNodeLabelsRetrieved() {
     return totalSucceededRemoveFromClusterNodeLabelsRetrieved.lastStat().mean();
   }
 
+  @VisibleForTesting
+  public double getLatencySucceededUpdateSchedulerConfigurationRetrieved() {
+    return totalSucceededUpdateSchedulerConfigurationRetrieved.lastStat().mean();
+  }
+
+  @VisibleForTesting
+  public double getLatencySucceededGetSchedulerConfigurationRetrieved() {
+    return totalSucceededGetSchedulerConfigurationRetrieved.lastStat().mean();
+  }
+
   @VisibleForTesting
   public double getLatencySucceededGetClusterInfoRetrieved() {
     return totalSucceededGetClusterInfoRetrieved.lastStat().mean();
@@ -1454,6 +1490,14 @@ public int getNumRemoveFromClusterNodeLabelsFailedRetrieved() {
     return numRemoveFromClusterNodeLabelsFailedRetrieved.value();
   }
 
+  public int getUpdateSchedulerConfigurationFailedRetrieved() {
+    return numUpdateSchedulerConfigurationFailedRetrieved.value();
+  }
+
+  public int getSchedulerConfigurationFailedRetrieved() {
+    return numGetSchedulerConfigurationFailedRetrieved.value();
+  }
+
   public int getClusterInfoFailedRetrieved() {
     return numGetClusterInfoFailedRetrieved.value();
   }
@@ -1773,6 +1817,16 @@ public void succeededRemoveFromClusterNodeLabelsRetrieved(long duration) {
     removeFromClusterNodeLabelsLatency.add(duration);
   }
 
+  public void succeededUpdateSchedulerConfigurationRetrieved(long duration) {
+    totalSucceededUpdateSchedulerConfigurationRetrieved.add(duration);
+    updateSchedulerConfigLatency.add(duration);
+  }
+
+  public void succeededGetSchedulerConfigurationRetrieved(long duration) {
+    totalSucceededGetSchedulerConfigurationRetrieved.add(duration);
+    getSchedulerConfigurationLatency.add(duration);
+  }
+
   public void succeededGetClusterInfoRetrieved(long duration) {
     totalSucceededGetClusterInfoRetrieved.add(duration);
     getClusterInfoLatency.add(duration);
@@ -2013,6 +2067,14 @@ public void incrRemoveFromClusterNodeLabelsFailedRetrieved() {
     numRemoveFromClusterNodeLabelsFailedRetrieved.incr();
   }
 
+  public void incrUpdateSchedulerConfigurationFailedRetrieved() {
+    numUpdateSchedulerConfigurationFailedRetrieved.incr();
+  }
+
+  public void incrGetSchedulerConfigurationFailedRetrieved() {
+    numGetSchedulerConfigurationFailedRetrieved.incr();
+  }
+
   public void incrGetClusterInfoFailedRetrieved() {
     numGetClusterInfoFailedRetrieved.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

@@ -44,7 +44,6 @@
 import javax.ws.rs.core.Response.Status;
 
 import org.apache.commons.collections.CollectionUtils;
-import org.apache.commons.lang3.NotImplementedException;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.impl.prefetch.Validate;
@@ -129,6 +128,7 @@
 import org.apache.hadoop.yarn.server.router.webapp.dao.FederationRMQueueAclInfo;
 import org.apache.hadoop.yarn.server.router.webapp.dao.SubClusterResult;
 import org.apache.hadoop.yarn.server.router.webapp.dao.FederationSchedulerTypeInfo;
+import org.apache.hadoop.yarn.server.router.webapp.dao.FederationConfInfo;
 import org.apache.hadoop.yarn.server.router.webapp.dao.FederationClusterUserInfo;
 import org.apache.hadoop.yarn.server.router.webapp.dao.FederationClusterInfo;
 import org.apache.hadoop.yarn.server.utils.BuilderUtils;
@@ -136,6 +136,7 @@
 import org.apache.hadoop.yarn.server.webapp.dao.ContainerInfo;
 import org.apache.hadoop.yarn.server.webapp.dao.ContainersInfo;
 import org.apache.hadoop.yarn.util.LRUCacheHashMap;
+import org.apache.hadoop.yarn.webapp.dao.ConfInfo;
 import org.apache.hadoop.yarn.webapp.dao.SchedConfUpdateInfo;
 import org.apache.hadoop.yarn.util.Clock;
 import org.apache.hadoop.yarn.util.MonotonicClock;
@@ -848,6 +849,29 @@ private Map<SubClusterId, SubClusterInfo> getActiveSubclusters()
     }
   }
 
+  /**
+   * Get the active subcluster in the federation.
+   *
+   * @param subClusterId subClusterId.
+   * @return subClusterInfo.
+   * @throws NotFoundException If the subclusters cannot be found.
+   */
+  private SubClusterInfo getActiveSubCluster(String subClusterId)
+      throws NotFoundException {
+    try {
+      SubClusterId pSubClusterId = SubClusterId.newInstance(subClusterId);
+      Map<SubClusterId, SubClusterInfo> subClusterInfoMap =
+          federationFacade.getSubClusters(true);
+      SubClusterInfo subClusterInfo = subClusterInfoMap.get(pSubClusterId);
+      if (subClusterInfo == null) {
+        throw new NotFoundException(subClusterId + " not found.");
+      }
+      return subClusterInfo;
+    } catch (YarnException e) {
+      throw new NotFoundException(e.getMessage());
+    }
+  }
+
   /**
    * The YARN Router will forward to the request to all the SubClusters to find
    * where the node is running.
@@ -2906,17 +2930,117 @@ public ContainerInfo getContainer(HttpServletRequest req,
     throw new RuntimeException("getContainer Failed.");
   }
 
+  /**
+   * This method updates the Scheduler configuration, and it is reachable by
+   * using {@link RMWSConsts#SCHEDULER_CONF}.
+   *
+   * @param mutationInfo th information for making scheduler configuration
+   *        changes (supports adding, removing, or updating a queue, as well
+   *        as global scheduler conf changes)
+   * @param hsr the servlet request
+   * @return Response containing the status code
+   * @throws AuthorizationException if the user is not authorized to invoke this
+   *         method
+   * @throws InterruptedException if interrupted
+   */
   @Override
   public Response updateSchedulerConfiguration(SchedConfUpdateInfo mutationInfo,
-      HttpServletRequest hsr)
-      throws AuthorizationException, InterruptedException {
-    throw new NotImplementedException("Code is not implemented");
+      HttpServletRequest hsr) throws AuthorizationException, InterruptedException {
+
+    // Make Sure mutationInfo is not null.
+    if (mutationInfo == null) {
+      routerMetrics.incrUpdateSchedulerConfigurationFailedRetrieved();
+      throw new IllegalArgumentException(
+          "Parameter error, the schedConfUpdateInfo is empty or null.");
+    }
+
+    // In federated mode, we may have a mix of multiple schedulers.
+    // In order to ensure accurate update scheduler configuration,
+    // we need users to explicitly set subClusterId.
+    String pSubClusterId = mutationInfo.getSubClusterId();
+    if (StringUtils.isBlank(pSubClusterId)) {
+      routerMetrics.incrUpdateSchedulerConfigurationFailedRetrieved();
+      throw new IllegalArgumentException("Parameter error, " +
+          "the subClusterId is empty or null.");
+    }
+
+    // Get the subClusterInfo , then update the scheduler configuration.
+    try {
+      long startTime = clock.getTime();
+      SubClusterInfo subClusterInfo = getActiveSubCluster(pSubClusterId);
+      DefaultRequestInterceptorREST interceptor = getOrCreateInterceptorForSubCluster(
+          subClusterInfo.getSubClusterId(), subClusterInfo.getRMWebServiceAddress());
+      Response response = interceptor.updateSchedulerConfiguration(mutationInfo, hsr);
+      if (response != null) {
+        long endTime = clock.getTime();
+        routerMetrics.succeededUpdateSchedulerConfigurationRetrieved(endTime - startTime);
+        return Response.status(response.getStatus()).entity(response.getEntity()).build();
+      }
+    } catch (NotFoundException e) {
+      routerMetrics.incrUpdateSchedulerConfigurationFailedRetrieved();
+      RouterServerUtil.logAndThrowRunTimeException(e,
+          "Get subCluster error. subClusterId = %s", pSubClusterId);
+    } catch (Exception e) {
+      routerMetrics.incrUpdateSchedulerConfigurationFailedRetrieved();
+      RouterServerUtil.logAndThrowRunTimeException(e,
+          "UpdateSchedulerConfiguration error. subClusterId = %s", pSubClusterId);
+    }
+
+    routerMetrics.incrUpdateSchedulerConfigurationFailedRetrieved();
+    throw new RuntimeException("UpdateSchedulerConfiguration error. subClusterId = "
+        + pSubClusterId);
   }
 
+  /**
+   * This method retrieves all the Scheduler configuration, and it is reachable
+   * by using {@link RMWSConsts#SCHEDULER_CONF}.
+   *
+   * @param hsr the servlet request
+   * @return Response containing the status code
+   * @throws AuthorizationException if the user is not authorized to invoke this
+   *      method.
+   */
   @Override
   public Response getSchedulerConfiguration(HttpServletRequest hsr)
       throws AuthorizationException {
-    throw new NotImplementedException("Code is not implemented");
+    try {
+      long startTime = clock.getTime();
+      FederationConfInfo federationConfInfo = new FederationConfInfo();
+      Map<SubClusterId, SubClusterInfo> subClustersActive = getActiveSubclusters();
+      final HttpServletRequest hsrCopy = clone(hsr);
+      Class[] argsClasses = new Class[]{HttpServletRequest.class};
+      Object[] args = new Object[]{hsrCopy};
+      ClientMethod remoteMethod = new ClientMethod("getSchedulerConfiguration", argsClasses, args);
+      Map<SubClusterInfo, Response> responseMap =
+          invokeConcurrent(subClustersActive.values(), remoteMethod, Response.class);
+      responseMap.forEach((subClusterInfo, response) -> {
+        SubClusterId subClusterId = subClusterInfo.getSubClusterId();
+        if (response == null) {
+          String errorMsg = subClusterId + " Can't getSchedulerConfiguration.";
+          federationConfInfo.getErrorMsgs().add(errorMsg);
+        } else if (response.getStatus() == Status.BAD_REQUEST.getStatusCode()) {
+          String errorMsg = String.valueOf(response.getEntity());
+          federationConfInfo.getErrorMsgs().add(errorMsg);
+        } else if (response.getStatus() == Status.OK.getStatusCode()) {
+          ConfInfo fedConfInfo = ConfInfo.class.cast(response.getEntity());
+          fedConfInfo.setSubClusterId(subClusterId.getId());
+          federationConfInfo.getList().add(fedConfInfo);
+        }
+      });
+      long endTime = clock.getTime();
+      routerMetrics.succeededGetSchedulerConfigurationRetrieved(endTime - startTime);
+      return Response.status(Status.OK).entity(federationConfInfo).build();
+    } catch (NotFoundException e) {
+      RouterServerUtil.logAndThrowRunTimeException("get all active sub cluster(s) error.", e);
+      routerMetrics.incrGetSchedulerConfigurationFailedRetrieved();
+    } catch (Exception e) {
+      routerMetrics.incrGetSchedulerConfigurationFailedRetrieved();
+      RouterServerUtil.logAndThrowRunTimeException("getSchedulerConfiguration error.", e);
+      return Response.status(Status.BAD_REQUEST).entity("getSchedulerConfiguration error.").build();
+    }
+
+    routerMetrics.incrGetSchedulerConfigurationFailedRetrieved();
+    throw new RuntimeException("getSchedulerConfiguration 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/FederationConfInfo.java

@@ -0,0 +1,55 @@
+/**
+ * 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.webapp.dao.ConfInfo;
+
+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 FederationConfInfo extends ConfInfo {
+  @XmlElement(name = "subCluster")
+  private List<ConfInfo> list = new ArrayList<>();
+
+  @XmlElement(name = "errorMsgs")
+  private List<String> errorMsgs = new ArrayList<>();
+  public FederationConfInfo() {
+  } // JAXB needs this
+
+  public List<ConfInfo> getList() {
+    return list;
+  }
+
+  public void setList(List<ConfInfo> list) {
+    this.list = list;
+  }
+
+  public List<String> getErrorMsgs() {
+    return errorMsgs;
+  }
+
+  public void setErrorMsgs(List<String> errorMsgs) {
+    this.errorMsgs = errorMsgs;
+  }
+}

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

@@ -569,6 +569,16 @@ public void getBulkActivitiesFailed() {
       metrics.incrGetBulkActivitiesFailedRetrieved();
     }
 
+    public void getSchedulerConfigurationFailed() {
+      LOG.info("Mocked: failed getSchedulerConfiguration call");
+      metrics.incrGetSchedulerConfigurationFailedRetrieved();
+    }
+
+    public void updateSchedulerConfigurationFailedRetrieved() {
+      LOG.info("Mocked: failed updateSchedulerConfiguration call");
+      metrics.incrUpdateSchedulerConfigurationFailedRetrieved();
+    }
+
     public void getClusterInfoFailed() {
       LOG.info("Mocked: failed getClusterInfo call");
       metrics.incrGetClusterInfoFailedRetrieved();
@@ -859,6 +869,16 @@ public void addToClusterNodeLabelsRetrieved(long duration) {
       metrics.succeededAddToClusterNodeLabelsRetrieved(duration);
     }
 
+    public void getSchedulerConfigurationRetrieved(long duration) {
+      LOG.info("Mocked: successful GetSchedulerConfiguration call with duration {}", duration);
+      metrics.succeededGetSchedulerConfigurationRetrieved(duration);
+    }
+
+    public void getUpdateSchedulerConfigurationRetrieved(long duration) {
+      LOG.info("Mocked: successful UpdateSchedulerConfiguration call with duration {}", duration);
+      metrics.succeededUpdateSchedulerConfigurationRetrieved(duration);
+    }
+
     public void getClusterInfoRetrieved(long duration) {
       LOG.info("Mocked: successful GetClusterInfoRetrieved call with duration {}", duration);
       metrics.succeededGetClusterInfoRetrieved(duration);
@@ -1889,6 +1909,52 @@ public void testAddToClusterNodeLabelsRetrieved() {
         metrics.getLatencySucceededAddToClusterNodeLabelsRetrieved(), ASSERT_DOUBLE_DELTA);
   }
 
+  @Test
+  public void testGetSchedulerConfigurationRetrievedFailed() {
+    long totalBadBefore = metrics.getSchedulerConfigurationFailedRetrieved();
+    badSubCluster.getSchedulerConfigurationFailed();
+    Assert.assertEquals(totalBadBefore + 1,
+        metrics.getSchedulerConfigurationFailedRetrieved());
+  }
+
+  @Test
+  public void testGetSchedulerConfigurationRetrieved() {
+    long totalGoodBefore = metrics.getNumSucceededGetSchedulerConfigurationRetrieved();
+    goodSubCluster.getSchedulerConfigurationRetrieved(150);
+    Assert.assertEquals(totalGoodBefore + 1,
+        metrics.getNumSucceededGetSchedulerConfigurationRetrieved());
+    Assert.assertEquals(150,
+        metrics.getLatencySucceededGetSchedulerConfigurationRetrieved(), ASSERT_DOUBLE_DELTA);
+    goodSubCluster.getSchedulerConfigurationRetrieved(300);
+    Assert.assertEquals(totalGoodBefore + 2,
+        metrics.getNumSucceededGetSchedulerConfigurationRetrieved());
+    Assert.assertEquals(225,
+        metrics.getLatencySucceededGetSchedulerConfigurationRetrieved(), ASSERT_DOUBLE_DELTA);
+  }
+
+  @Test
+  public void testUpdateSchedulerConfigurationRetrievedFailed() {
+    long totalBadBefore = metrics.getUpdateSchedulerConfigurationFailedRetrieved();
+    badSubCluster.updateSchedulerConfigurationFailedRetrieved();
+    Assert.assertEquals(totalBadBefore + 1,
+        metrics.getUpdateSchedulerConfigurationFailedRetrieved());
+  }
+
+  @Test
+  public void testUpdateSchedulerConfigurationRetrieved() {
+    long totalGoodBefore = metrics.getNumSucceededUpdateSchedulerConfigurationRetrieved();
+    goodSubCluster.getUpdateSchedulerConfigurationRetrieved(150);
+    Assert.assertEquals(totalGoodBefore + 1,
+        metrics.getNumSucceededUpdateSchedulerConfigurationRetrieved());
+    Assert.assertEquals(150,
+        metrics.getLatencySucceededUpdateSchedulerConfigurationRetrieved(), ASSERT_DOUBLE_DELTA);
+    goodSubCluster.getUpdateSchedulerConfigurationRetrieved(300);
+    Assert.assertEquals(totalGoodBefore + 2,
+        metrics.getNumSucceededUpdateSchedulerConfigurationRetrieved());
+    Assert.assertEquals(225,
+        metrics.getLatencySucceededUpdateSchedulerConfigurationRetrieved(), ASSERT_DOUBLE_DELTA);
+  }
+
   @Test
   public void testGetClusterInfoRetrievedFailed() {
     long totalBadBefore = metrics.getClusterInfoFailedRetrieved();

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

@@ -102,6 +102,7 @@
 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.capacity.conf.MutableCSConfigurationProvider;
 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;
@@ -159,6 +160,8 @@
 import org.apache.hadoop.yarn.webapp.BadRequestException;
 import org.apache.hadoop.yarn.webapp.ForbiddenException;
 import org.apache.hadoop.yarn.webapp.NotFoundException;
+import org.apache.hadoop.yarn.webapp.dao.ConfInfo;
+import org.apache.hadoop.yarn.webapp.dao.SchedConfUpdateInfo;
 import org.mockito.Mockito;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -1007,7 +1010,7 @@ private void updateReservation(ReservationUpdateRequestInfo resContext) throws I
     }
 
     if (resContext.getReservationId() == null) {
-      throw new BadRequestException("Update operations must specify an existing ReservaitonId");
+      throw new BadRequestException("Update operations must specify an existing ReservationId");
     }
 
     ReservationRequestInterpreter[] values = ReservationRequestInterpreter.values();
@@ -1366,6 +1369,29 @@ public Response removeFromClusterNodeLabels(Set<String> oldNodeLabels, HttpServl
   }
 
   @Override
+  public Response updateSchedulerConfiguration(SchedConfUpdateInfo mutationInfo,
+      HttpServletRequest req) throws AuthorizationException, InterruptedException {
+    RMContext rmContext = mockRM.getRMContext();
+    MutableCSConfigurationProvider provider = new MutableCSConfigurationProvider(rmContext);
+    try {
+      Configuration conf = new Configuration();
+      conf.set(YarnConfiguration.SCHEDULER_CONFIGURATION_STORE_CLASS,
+          YarnConfiguration.MEMORY_CONFIGURATION_STORE);
+      provider.init(conf);
+      provider.logAndApplyMutation(UserGroupInformation.getCurrentUser(), mutationInfo);
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+    return Response.status(Status.OK).
+        entity("Configuration change successfully applied.").build();
+  }
+
+  @Override
+  public Response getSchedulerConfiguration(HttpServletRequest req) throws AuthorizationException {
+    return Response.status(Status.OK).entity(new ConfInfo(mockRM.getConfig()))
+        .build();
+  }
+
   public ClusterInfo getClusterInfo() {
     ClusterInfo clusterInfo = new ClusterInfo(mockRM);
     return clusterInfo;

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

@@ -126,6 +126,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ActivitiesInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.NodeAllocationInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.BulkActivitiesInfo;
+import org.apache.hadoop.yarn.server.router.webapp.dao.FederationConfInfo;
 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;
@@ -138,6 +139,9 @@
 import org.apache.hadoop.yarn.util.Times;
 import org.apache.hadoop.yarn.util.YarnVersionInfo;
 import org.apache.hadoop.yarn.webapp.BadRequestException;
+import org.apache.hadoop.yarn.webapp.dao.ConfInfo;
+import org.apache.hadoop.yarn.webapp.dao.QueueConfigInfo;
+import org.apache.hadoop.yarn.webapp.dao.SchedConfUpdateInfo;
 import org.apache.hadoop.yarn.webapp.util.WebAppUtils;
 import org.junit.Assert;
 import org.junit.Test;
@@ -171,6 +175,7 @@ public class TestFederationInterceptorREST extends BaseRouterWebServicesTest {
   private final static int NUM_SUBCLUSTER = 4;
   private static final int BAD_REQUEST = 400;
   private static final int ACCEPTED = 202;
+  private static final int OK = 200;
   private static String user = "test-user";
   private TestableFederationInterceptorREST interceptor;
   private MemoryFederationStateStore stateStore;
@@ -2134,6 +2139,35 @@ public void testRemoveFromClusterNodeLabelsError() throws Exception {
         () -> interceptor.removeFromClusterNodeLabels(oldNodeLabels1, null));
   }
 
+  @Test
+  public void testGetSchedulerConfiguration() throws Exception {
+    Response response = interceptor.getSchedulerConfiguration(null);
+    Assert.assertNotNull(response);
+    Assert.assertEquals(OK, response.getStatus());
+
+    Object entity = response.getEntity();
+    Assert.assertNotNull(entity);
+    Assert.assertTrue(entity instanceof FederationConfInfo);
+
+    FederationConfInfo federationConfInfo = FederationConfInfo.class.cast(entity);
+    List<ConfInfo> confInfos = federationConfInfo.getList();
+    Assert.assertNotNull(confInfos);
+    Assert.assertEquals(4, confInfos.size());
+
+    List<String> errors = federationConfInfo.getErrorMsgs();
+    Assert.assertEquals(0, errors.size());
+
+    Set<String> subClusterSet = subClusters.stream()
+        .map(subClusterId -> subClusterId.getId()).collect(Collectors.toSet());
+
+    for (ConfInfo confInfo : confInfos) {
+      List<ConfInfo.ConfItem> confItems = confInfo.getItems();
+      Assert.assertNotNull(confItems);
+      Assert.assertTrue(confItems.size() > 0);
+      Assert.assertTrue(subClusterSet.contains(confInfo.getSubClusterId()));
+    }
+  }
+
   @Test
   public void testGetClusterUserInfo() {
     String requestUserName = "test-user";
@@ -2173,6 +2207,41 @@ public void testGetClusterUserInfo() {
     }
   }
 
+  @Test
+  public void testUpdateSchedulerConfigurationErrorMsg() throws Exception {
+    SchedConfUpdateInfo mutationInfo = new SchedConfUpdateInfo();
+    LambdaTestUtils.intercept(IllegalArgumentException.class,
+        "Parameter error, the subClusterId is empty or null.",
+        () -> interceptor.updateSchedulerConfiguration(mutationInfo, null));
+
+    LambdaTestUtils.intercept(IllegalArgumentException.class,
+        "Parameter error, the schedConfUpdateInfo is empty or null.",
+        () -> interceptor.updateSchedulerConfiguration(null, null));
+  }
+
+  @Test
+  public void testUpdateSchedulerConfiguration()
+      throws AuthorizationException, InterruptedException {
+    SchedConfUpdateInfo updateInfo = new SchedConfUpdateInfo();
+    updateInfo.setSubClusterId("1");
+    Map<String, String> goodUpdateMap = new HashMap<>();
+    goodUpdateMap.put("goodKey", "goodVal");
+    QueueConfigInfo goodUpdateInfo = new
+        QueueConfigInfo("root.default", goodUpdateMap);
+    updateInfo.getUpdateQueueInfo().add(goodUpdateInfo);
+    Response response = interceptor.updateSchedulerConfiguration(updateInfo, null);
+
+    Assert.assertNotNull(response);
+    Assert.assertEquals(OK, response.getStatus());
+
+    String expectMsg = "Configuration change successfully applied.";
+    Object entity = response.getEntity();
+    Assert.assertNotNull(entity);
+
+    String entityMsg = String.valueOf(entity);
+    Assert.assertEquals(expectMsg, entityMsg);
+  }
+
   @Test
   public void testGetClusterInfo() {
     ClusterInfo clusterInfos = interceptor.getClusterInfo();