Revert "HDFS-14750. RBF: Support dynamic handler allocation in routers (#4199)" (#4306)

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/fairness/AbstractRouterRpcFairnessPolicyController.java

@@ -22,13 +22,10 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.LongAdder;
 
 import org.codehaus.jettison.json.JSONException;
 import org.codehaus.jettison.json.JSONObject;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hdfs.server.federation.utils.AdjustableSemaphore;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -43,10 +40,7 @@ public class AbstractRouterRpcFairnessPolicyController
       LoggerFactory.getLogger(AbstractRouterRpcFairnessPolicyController.class);
 
   /** Hash table to hold semaphore for each configured name service. */
-  private Map<String, AdjustableSemaphore> permits;
-  private final Map<String, Integer> permitSizes = new HashMap<>();
-  private Map<String, LongAdder> rejectedPermitsPerNs;
-  private Map<String, LongAdder> acceptedPermitsPerNs;
+  private Map<String, Semaphore> permits;
 
   public void init(Configuration conf) {
     this.permits = new HashMap<>();
@@ -78,7 +72,7 @@ public class AbstractRouterRpcFairnessPolicyController
   }
 
   protected void insertNameServiceWithPermits(String nsId, int maxPermits) {
-    this.permits.put(nsId, new AdjustableSemaphore(maxPermits));
+    this.permits.put(nsId, new Semaphore(maxPermits));
   }
 
   protected int getAvailablePermits(String nsId) {
@@ -88,7 +82,7 @@ public class AbstractRouterRpcFairnessPolicyController
   @Override
   public String getAvailableHandlerOnPerNs() {
     JSONObject json = new JSONObject();
-    for (Map.Entry<String, AdjustableSemaphore> entry : permits.entrySet()) {
+    for (Map.Entry<String, Semaphore> entry : permits.entrySet()) {
       try {
         String nsId = entry.getKey();
         int availableHandler = entry.getValue().availablePermits();
@@ -99,39 +93,4 @@ public class AbstractRouterRpcFairnessPolicyController
     }
     return json.toString();
   }
-
-  @Override
-  public String getPermitCapacityPerNs() {
-    JSONObject json = new JSONObject();
-    for (Map.Entry<String, Integer> entry : permitSizes.entrySet()) {
-      try {
-        json.put(entry.getKey(), entry.getValue());
-      } catch (JSONException e) {
-        LOG.warn("Cannot put {} into JSONObject", entry.getKey(), e);
-      }
-    }
-    return json.toString();
-  }
-
-  @Override
-  public void setMetrics(Map<String, LongAdder> rejectedPermits,
-      Map<String, LongAdder> acceptedPermits) {
-    this.rejectedPermitsPerNs = rejectedPermits;
-    this.acceptedPermitsPerNs = acceptedPermits;
-  }
-
-  protected Map<String, AdjustableSemaphore> getPermits() {
-    return permits;
-  }
-
-  public Map<String, LongAdder> getRejectedPermitsPerNs() {
-    return rejectedPermitsPerNs;
-  }
-  public Map<String, LongAdder> getAcceptedPermitsPerNs() {
-    return acceptedPermitsPerNs;
-  }
-
-  protected Map<String, Integer> getPermitSizes() {
-    return permitSizes;
-  }
 }

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/fairness/DynamicRouterRpcFairnessPolicyController.java

@@ -1,178 +0,0 @@
-/**
- * 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.hdfs.server.federation.fairness;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledFuture;
-import java.util.concurrent.TimeUnit;
-
-import org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import org.apache.hadoop.classification.VisibleForTesting;
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hdfs.server.federation.utils.AdjustableSemaphore;
-import org.apache.hadoop.util.concurrent.HadoopExecutors;
-
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_DYNAMIC_FAIRNESS_CONTROLLER_REFRESH_INTERVAL_SECONDS_DEFAULT;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_DYNAMIC_FAIRNESS_CONTROLLER_REFRESH_INTERVAL_SECONDS_KEY;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_DEFAULT;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HANDLER_COUNT_DEFAULT;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HANDLER_COUNT_KEY;
-
-/**
- * Dynamic fairness policy extending {@link StaticRouterRpcFairnessPolicyController}
- * and fetching handlers from configuration for all available name services.
- * The handlers count changes according to traffic to namespaces.
- * Total handlers might NOT strictly add up to the value defined by DFS_ROUTER_HANDLER_COUNT_KEY
- * but will not exceed initial handler count + number of nameservices.
- */
-public class DynamicRouterRpcFairnessPolicyController
-    extends StaticRouterRpcFairnessPolicyController {
-
-  private static final Logger LOG =
-      LoggerFactory.getLogger(DynamicRouterRpcFairnessPolicyController.class);
-
-  private static final ScheduledExecutorService SCHEDULED_EXECUTOR = HadoopExecutors
-      .newSingleThreadScheduledExecutor(new ThreadFactoryBuilder().setDaemon(true)
-          .setNameFormat("DynamicRouterRpcFairnessPolicyControllerPermitsResizer").build());
-  private PermitsResizerService permitsResizerService;
-  private ScheduledFuture<?> refreshTask;
-  private int handlerCount;
-  private int minimumHandlerPerNs;
-
-  /**
-   * Initializes using the same logic as {@link StaticRouterRpcFairnessPolicyController}
-   * and starts a periodic semaphore resizer thread.
-   *
-   * @param conf configuration
-   */
-  public DynamicRouterRpcFairnessPolicyController(Configuration conf) {
-    super(conf);
-    minimumHandlerPerNs = conf.getInt(DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY,
-        DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_DEFAULT);
-    handlerCount = conf.getInt(DFS_ROUTER_HANDLER_COUNT_KEY, DFS_ROUTER_HANDLER_COUNT_DEFAULT);
-    long refreshInterval =
-        conf.getTimeDuration(DFS_ROUTER_DYNAMIC_FAIRNESS_CONTROLLER_REFRESH_INTERVAL_SECONDS_KEY,
-            DFS_ROUTER_DYNAMIC_FAIRNESS_CONTROLLER_REFRESH_INTERVAL_SECONDS_DEFAULT,
-            TimeUnit.SECONDS);
-    permitsResizerService = new PermitsResizerService();
-    refreshTask = SCHEDULED_EXECUTOR
-        .scheduleWithFixedDelay(permitsResizerService, refreshInterval, refreshInterval,
-            TimeUnit.SECONDS);
-  }
-
-  @VisibleForTesting
-  public DynamicRouterRpcFairnessPolicyController(Configuration conf, long refreshInterval) {
-    super(conf);
-    minimumHandlerPerNs = conf.getInt(DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY,
-        DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_DEFAULT);
-    handlerCount = conf.getInt(DFS_ROUTER_HANDLER_COUNT_KEY, DFS_ROUTER_HANDLER_COUNT_DEFAULT);
-    permitsResizerService = new PermitsResizerService();
-    refreshTask = SCHEDULED_EXECUTOR
-        .scheduleWithFixedDelay(permitsResizerService, refreshInterval, refreshInterval,
-            TimeUnit.SECONDS);
-  }
-
-  @VisibleForTesting
-  public void refreshPermitsCap() {
-    permitsResizerService.run();
-  }
-
-  @Override
-  public void shutdown() {
-    super.shutdown();
-    if (refreshTask != null) {
-      refreshTask.cancel(true);
-    }
-    if (SCHEDULED_EXECUTOR != null) {
-      SCHEDULED_EXECUTOR.shutdown();
-    }
-  }
-
-  class PermitsResizerService implements Runnable {
-
-    @Override
-    public synchronized void run() {
-      if ((getRejectedPermitsPerNs() == null) || (getAcceptedPermitsPerNs() == null)) {
-        return;
-      }
-      long totalOps = 0;
-      Map<String, Long> nsOps = new HashMap<>();
-      for (Map.Entry<String, AdjustableSemaphore> entry : getPermits().entrySet()) {
-        long ops = (getRejectedPermitsPerNs().containsKey(entry.getKey()) ?
-            getRejectedPermitsPerNs().get(entry.getKey()).longValue() :
-            0) + (getAcceptedPermitsPerNs().containsKey(entry.getKey()) ?
-            getAcceptedPermitsPerNs().get(entry.getKey()).longValue() :
-            0);
-        nsOps.put(entry.getKey(), ops);
-        totalOps += ops;
-      }
-
-      List<String> underMinimumNss = new ArrayList<>();
-      List<String> overMinimumNss = new ArrayList<>();
-      int effectiveOps = 0;
-
-      // First iteration: split namespaces into those underused and those that are not.
-      for (Map.Entry<String, AdjustableSemaphore> entry : getPermits().entrySet()) {
-        String ns = entry.getKey();
-        int newPermitCap = (int) Math.ceil((float) nsOps.get(ns) / totalOps * handlerCount);
-
-        if (newPermitCap <= minimumHandlerPerNs) {
-          underMinimumNss.add(ns);
-        } else {
-          overMinimumNss.add(ns);
-          effectiveOps += nsOps.get(ns);
-        }
-      }
-
-      // Second iteration part 1: assign minimum handlers
-      for (String ns: underMinimumNss) {
-        resizeNsHandlerCapacity(ns, minimumHandlerPerNs);
-      }
-      // Second iteration part 2: assign handlers to the rest
-      int leftoverPermits = handlerCount - minimumHandlerPerNs * underMinimumNss.size();
-      for (String ns: overMinimumNss) {
-        int newPermitCap = (int) Math.ceil((float) nsOps.get(ns) / effectiveOps * leftoverPermits);
-        resizeNsHandlerCapacity(ns, newPermitCap);
-      }
-    }
-
-    private void resizeNsHandlerCapacity(String ns, int newPermitCap) {
-      AdjustableSemaphore semaphore = getPermits().get(ns);
-      int oldPermitCap = getPermitSizes().get(ns);
-      if (newPermitCap <= minimumHandlerPerNs) {
-        newPermitCap = minimumHandlerPerNs;
-      }
-      getPermitSizes().put(ns, newPermitCap);
-      if (newPermitCap > oldPermitCap) {
-        semaphore.release(newPermitCap - oldPermitCap);
-      } else if (newPermitCap < oldPermitCap) {
-        semaphore.reducePermits(oldPermitCap - newPermitCap);
-      }
-      LOG.info("Resized handlers for nsId {} from {} to {}", ns, oldPermitCap, newPermitCap);
-    }
-  }
-}

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/fairness/NoRouterRpcFairnessPolicyController.java

@@ -18,9 +18,6 @@
 
 package org.apache.hadoop.hdfs.server.federation.fairness;
 
-import java.util.Map;
-import java.util.concurrent.atomic.LongAdder;
-
 import org.apache.hadoop.conf.Configuration;
 
 /**
@@ -54,15 +51,4 @@ public class NoRouterRpcFairnessPolicyController implements
   public String getAvailableHandlerOnPerNs(){
     return "N/A";
   }
-
-  @Override
-  public String getPermitCapacityPerNs() {
-    return "N/A";
-  }
-
-  @Override
-  public void setMetrics(Map<String, LongAdder> rejectedPermitsPerNs,
-      Map<String, LongAdder> acceptedPermitsPerNs) {
-    // Nothing
-  }
 }

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/fairness/RouterRpcFairnessPolicyController.java

@@ -18,9 +18,6 @@
 
 package org.apache.hadoop.hdfs.server.federation.fairness;
 
-import java.util.Map;
-import java.util.concurrent.atomic.LongAdder;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 
@@ -70,15 +67,4 @@ public interface RouterRpcFairnessPolicyController {
    * Returns the JSON string of the available handler for each Ns.
    */
   String getAvailableHandlerOnPerNs();
-
-  /**
-   * Returns the JSON string of the max handler count for each ns.
-   */
-  String getPermitCapacityPerNs();
-
-  /**
-   * Attaches permits access metrics to the controller.
-   */
-  void setMetrics(Map<String, LongAdder> rejectedPermitsPerNs,
-      Map<String, LongAdder> acceptedPermitsPerNs);
 }

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/fairness/StaticRouterRpcFairnessPolicyController.java

@@ -27,8 +27,6 @@ import java.util.Set;
 import java.util.HashSet;
 
 import static org.apache.hadoop.hdfs.server.federation.fairness.RouterRpcFairnessConstants.CONCURRENT_NS;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_DEFAULT;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HANDLER_COUNT_KEY;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HANDLER_COUNT_DEFAULT;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_FAIR_HANDLER_COUNT_KEY_PREFIX;
@@ -47,9 +45,6 @@ public class StaticRouterRpcFairnessPolicyController extends
   public static final String ERROR_MSG = "Configured handlers "
       + DFS_ROUTER_HANDLER_COUNT_KEY + '='
       + " %d is less than the minimum required handlers %d";
-  public static final String ERROR_NS_MSG =
-      "Configured handlers %s=%d is less than the minimum required handlers %d";
-
 
   public StaticRouterRpcFairnessPolicyController(Configuration conf) {
     init(conf);
@@ -83,7 +78,6 @@ public class StaticRouterRpcFairnessPolicyController extends
         handlerCount -= dedicatedHandlers;
         insertNameServiceWithPermits(nsId, dedicatedHandlers);
         logAssignment(nsId, dedicatedHandlers);
-        getPermitSizes().put(nsId, dedicatedHandlers);
       } else {
         unassignedNS.add(nsId);
       }
@@ -98,7 +92,6 @@ public class StaticRouterRpcFairnessPolicyController extends
       for (String nsId : unassignedNS) {
         insertNameServiceWithPermits(nsId, handlersPerNS);
         logAssignment(nsId, handlersPerNS);
-        getPermitSizes().put(nsId, handlersPerNS);
       }
     }
 
@@ -110,7 +103,6 @@ public class StaticRouterRpcFairnessPolicyController extends
       LOG.info("Assigned extra {} handlers to commons pool", leftOverHandlers);
       insertNameServiceWithPermits(CONCURRENT_NS,
           existingPermits + leftOverHandlers);
-      getPermitSizes().put(CONCURRENT_NS, existingPermits + leftOverHandlers);
     }
     LOG.info("Final permit allocation for concurrent ns: {}",
         getAvailablePermits(CONCURRENT_NS));
@@ -124,23 +116,15 @@ public class StaticRouterRpcFairnessPolicyController extends
   private void validateHandlersCount(Configuration conf, int handlerCount,
                                      Set<String> allConfiguredNS) {
     int totalDedicatedHandlers = 0;
-    int minimumHandlerPerNs = conf.getInt(DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY,
-        DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_DEFAULT);
     for (String nsId : allConfiguredNS) {
       int dedicatedHandlers =
               conf.getInt(DFS_ROUTER_FAIR_HANDLER_COUNT_KEY_PREFIX + nsId, 0);
       if (dedicatedHandlers > 0) {
-        if (dedicatedHandlers < minimumHandlerPerNs) {
-          String msg = String.format(ERROR_NS_MSG, DFS_ROUTER_FAIR_HANDLER_COUNT_KEY_PREFIX + nsId,
-              handlerCount, minimumHandlerPerNs);
-          LOG.error(msg);
-          throw new IllegalArgumentException(msg);
-        }
         // Total handlers should not be less than sum of dedicated handlers.
         totalDedicatedHandlers += dedicatedHandlers;
       } else {
-        // Each NS has to have a minimum number of handlers assigned.
-        totalDedicatedHandlers += minimumHandlerPerNs;
+        // Each NS should have at least one handler assigned.
+        totalDedicatedHandlers++;
       }
     }
     if (totalDedicatedHandlers > handlerCount) {
@@ -150,4 +134,5 @@ public class StaticRouterRpcFairnessPolicyController extends
       throw new IllegalArgumentException(msg);
     }
   }
+
 }

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/FederationRPCMBean.java

@@ -115,12 +115,6 @@ public interface FederationRPCMBean {
    */
   String getAvailableHandlerOnPerNs();
 
-  /**
-   * JSON representation of max handler count per ns.
-   * @return JSON string representation.
-   */
-  String getPermitCapacityPerNs();
-
   /**
    * Get the JSON representation of the async caller thread pool.
    * @return JSON string representation of the async caller thread pool.

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/FederationRPCMetrics.java

@@ -247,11 +247,6 @@ public class FederationRPCMetrics implements FederationRPCMBean {
         getRouterRpcFairnessPolicyController().getAvailableHandlerOnPerNs();
   }
 
-  @Override
-  public String getPermitCapacityPerNs() {
-    return rpcServer.getRPCClient().getRouterRpcFairnessPolicyController().getPermitCapacityPerNs();
-  }
-
   @Override
   public String getAsyncCallerPool() {
     return rpcServer.getRPCClient().getAsyncCallerPoolJson();

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/FederationUtil.java

@@ -29,9 +29,7 @@ import java.net.URLConnection;
 import java.util.Collection;
 import java.util.EnumSet;
 import java.util.HashSet;
-import java.util.Map;
 import java.util.Set;
-import java.util.concurrent.atomic.LongAdder;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.DFSUtil;
@@ -273,22 +271,6 @@ public final class FederationUtil {
     return newInstance(conf, null, null, clazz);
   }
 
-  /**
-   * Creates an instance of an RouterRpcFairnessPolicyController
-   * from the configuration and attaches permits access metrics to the controller.
-   *
-   * @param conf Configuration that defines the fairness controller class.
-   * @param rejectedPermitsPerNs Metrics map ns:rejected permits
-   * @param acceptedPermitsPerNs Metrics map ns:accepted permits
-   * @return Fairness policy controller.
-   */
-  public static RouterRpcFairnessPolicyController newFairnessPolicyController(Configuration conf,
-      Map<String, LongAdder> rejectedPermitsPerNs, Map<String, LongAdder> acceptedPermitsPerNs) {
-    RouterRpcFairnessPolicyController instance = newFairnessPolicyController(conf);
-    instance.setMetrics(rejectedPermitsPerNs, acceptedPermitsPerNs);
-    return instance;
-  }
-
   /**
    * Collect all configured nameservices.
    *

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RBFConfigKeys.java

@@ -18,8 +18,6 @@
 
 package org.apache.hadoop.hdfs.server.federation.router;
 
-import java.util.concurrent.TimeUnit;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.hdfs.server.federation.fairness.NoRouterRpcFairnessPolicyController;
@@ -29,11 +27,13 @@ import org.apache.hadoop.hdfs.server.federation.resolver.ActiveNamenodeResolver;
 import org.apache.hadoop.hdfs.server.federation.resolver.FileSubclusterResolver;
 import org.apache.hadoop.hdfs.server.federation.resolver.MembershipNamenodeResolver;
 import org.apache.hadoop.hdfs.server.federation.resolver.MountTableResolver;
-import org.apache.hadoop.hdfs.server.federation.router.security.token.ZKDelegationTokenSecretManagerImpl;
 import org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreDriver;
 import org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreSerializerPBImpl;
 import org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreZooKeeperImpl;
 import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
+import org.apache.hadoop.hdfs.server.federation.router.security.token.ZKDelegationTokenSecretManagerImpl;
+
+import java.util.concurrent.TimeUnit;
 
 /**
  * Config fields for router-based hdfs federation.
@@ -354,13 +354,6 @@ public class RBFConfigKeys extends CommonConfigurationKeysPublic {
       NoRouterRpcFairnessPolicyController.class;
   public static final String DFS_ROUTER_FAIR_HANDLER_COUNT_KEY_PREFIX =
       FEDERATION_ROUTER_FAIRNESS_PREFIX + "handler.count.";
-  public static final String DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY =
-      FEDERATION_ROUTER_FAIRNESS_PREFIX + "minimum.handler.count";
-  public static final int DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_DEFAULT = 1;
-  public static final long DFS_ROUTER_DYNAMIC_FAIRNESS_CONTROLLER_REFRESH_INTERVAL_SECONDS_DEFAULT =
-      600;
-  public static final String DFS_ROUTER_DYNAMIC_FAIRNESS_CONTROLLER_REFRESH_INTERVAL_SECONDS_KEY =
-      FEDERATION_ROUTER_FAIRNESS_PREFIX + "policy.controller.dynamic.refresh.interval.seconds";
 
   // HDFS Router Federation Rename.
   public static final String DFS_ROUTER_FEDERATION_RENAME_PREFIX =

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java

@@ -156,8 +156,8 @@ public class RouterRpcClient {
             HADOOP_CALLER_CONTEXT_SEPARATOR_DEFAULT);
     this.connectionManager = new ConnectionManager(clientConf);
     this.connectionManager.start();
-    this.routerRpcFairnessPolicyController = FederationUtil
-        .newFairnessPolicyController(conf, rejectedPermitsPerNs, acceptedPermitsPerNs);
+    this.routerRpcFairnessPolicyController =
+        FederationUtil.newFairnessPolicyController(conf);
 
     int numThreads = conf.getInt(
         RBFConfigKeys.DFS_ROUTER_CLIENT_THREADS_SIZE,

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/utils/AdjustableSemaphore.java

@@ -1,36 +0,0 @@
-/**
- * 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.hdfs.server.federation.utils;
-
-import java.util.concurrent.Semaphore;
-
-public class AdjustableSemaphore extends Semaphore {
-
-  public AdjustableSemaphore(int permits) {
-    super(permits);
-  }
-
-  public AdjustableSemaphore(int permits, boolean fair) {
-    super(permits, fair);
-  }
-
-  public void reducePermits(int reduction) {
-    super.reducePermits(reduction);
-  }
-}

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/resources/hdfs-rbf-default.xml

@@ -706,24 +706,6 @@
     </description>
   </property>
 
-  <property>
-    <name>dfs.federation.router.fairness.minimum.handler.count</name>
-    <value>1</value>
-    <description>
-      Minimum number of handlers assigned per nameservice.
-      If any dedicated handler count is smaller than this number,
-      router initialization will fail.
-    </description>
-  </property>
-
-  <property>
-    <name>dfs.federation.router.fairness.policy.controller.dynamic.refresh.interval.seconds</name>
-    <value>600</value>
-    <description>
-      Interval (in seconds) between each handler count resize by DynamicFairnessPolicyController
-    </description>
-  </property>
-
   <property>
     <name>dfs.federation.router.fairness.handler.count.EXAMPLENAMESERVICE</name>
     <value></value>

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/fairness/TestDynamicRouterRpcFairnessPolicyController.java

@@ -1,181 +0,0 @@
-/**
- * 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.hdfs.server.federation.fairness;
-
-import java.util.HashMap;
-import java.util.Map;
-import java.util.concurrent.TimeoutException;
-import java.util.concurrent.atomic.LongAdder;
-
-import org.junit.Assert;
-import org.junit.Test;
-
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hdfs.HdfsConfiguration;
-import org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys;
-
-import static org.apache.hadoop.hdfs.server.federation.fairness.RouterRpcFairnessConstants.CONCURRENT_NS;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HANDLER_COUNT_KEY;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_MONITOR_NAMENODE;
-
-/**
- * Test functionality of {@link DynamicRouterRpcFairnessPolicyController).
- */
-public class TestDynamicRouterRpcFairnessPolicyController {
-
-  private static String nameServices = "ns1.nn1, ns1.nn2, ns2.nn1, ns2.nn2, ns3.nn1";
-
-  @Test
-  public void testDynamicControllerSimple() throws InterruptedException, TimeoutException {
-//    verifyDynamicControllerSimple(true);
-    verifyDynamicControllerSimple(false);
-  }
-
-  @Test
-  public void testDynamicControllerAllPermitsAcquired() throws InterruptedException {
-    verifyDynamicControllerAllPermitsAcquired(true);
-    verifyDynamicControllerAllPermitsAcquired(false);
-  }
-
-  private void verifyDynamicControllerSimple(boolean manualRefresh)
-      throws InterruptedException, TimeoutException {
-    // 3 permits each ns
-    DynamicRouterRpcFairnessPolicyController controller;
-    if (manualRefresh) {
-      controller = getFairnessPolicyController(20);
-    } else {
-      controller = getFairnessPolicyController(20, 4);
-    }
-
-    String[] nss = new String[] {"ns1", "ns2", "ns3", CONCURRENT_NS};
-    // Initial permit counts should be 5:5:5
-    verifyRemainingPermitCounts(new int[] {5, 5, 5, 5}, nss, controller);
-
-    // Release all permits
-    for (int i = 0; i < 5; i++) {
-      controller.releasePermit("ns1");
-      controller.releasePermit("ns2");
-      controller.releasePermit("ns3");
-      controller.releasePermit(CONCURRENT_NS);
-    }
-
-    // Inject dummy metrics
-    // Split half half for ns1 and concurrent
-    Map<String, LongAdder> rejectedPermitsPerNs = new HashMap<>();
-    Map<String, LongAdder> acceptedPermitsPerNs = new HashMap<>();
-    injectDummyMetrics(rejectedPermitsPerNs, "ns1", 10);
-    injectDummyMetrics(rejectedPermitsPerNs, "ns2", 0);
-    injectDummyMetrics(rejectedPermitsPerNs, "ns3", 10);
-    injectDummyMetrics(rejectedPermitsPerNs, CONCURRENT_NS, 10);
-    controller.setMetrics(rejectedPermitsPerNs, acceptedPermitsPerNs);
-
-    // Current permits count should be 6:3:6:6
-    int[] newPermitCounts = new int[] {6, 3, 6, 6};
-
-    if (manualRefresh) {
-      controller.refreshPermitsCap();
-    } else {
-      Thread.sleep(5000);
-    }
-    verifyRemainingPermitCounts(newPermitCounts, nss, controller);
-
-  }
-
-  public void verifyDynamicControllerAllPermitsAcquired(boolean manualRefresh)
-      throws InterruptedException {
-    // 10 permits each ns
-    DynamicRouterRpcFairnessPolicyController controller;
-    if (manualRefresh) {
-      controller = getFairnessPolicyController(40);
-    } else {
-      controller = getFairnessPolicyController(40, 4);
-    }
-
-    String[] nss = new String[] {"ns1", "ns2", "ns3", CONCURRENT_NS};
-    verifyRemainingPermitCounts(new int[] {10, 10, 10, 10}, nss, controller);
-
-    // Inject dummy metrics
-    Map<String, LongAdder> rejectedPermitsPerNs = new HashMap<>();
-    Map<String, LongAdder> acceptedPermitsPerNs = new HashMap<>();
-    injectDummyMetrics(rejectedPermitsPerNs, "ns1", 13);
-    injectDummyMetrics(rejectedPermitsPerNs, "ns2", 13);
-    injectDummyMetrics(rejectedPermitsPerNs, "ns3", 13);
-    injectDummyMetrics(rejectedPermitsPerNs, CONCURRENT_NS, 1);
-    // New permit capacity will be 13:13:13:3
-    controller.setMetrics(rejectedPermitsPerNs, acceptedPermitsPerNs);
-    if (manualRefresh) {
-      controller.refreshPermitsCap();
-    } else {
-      Thread.sleep(5000);
-    }
-    Assert.assertEquals("{\"concurrent\":-7,\"ns2\":3,\"ns1\":3,\"ns3\":3}",
-        controller.getAvailableHandlerOnPerNs());
-
-    // Can acquire 3 more permits for ns1, ns2, ns3
-    verifyRemainingPermitCounts(new int[] {3, 3, 3, 0}, nss, controller);
-    // Need to release at least 8 permits for concurrent before it has any free permits
-    Assert.assertFalse(controller.acquirePermit(CONCURRENT_NS));
-    for (int i = 0; i < 7; i++) {
-      controller.releasePermit(CONCURRENT_NS);
-    }
-    Assert.assertFalse(controller.acquirePermit(CONCURRENT_NS));
-    controller.releasePermit(CONCURRENT_NS);
-    Assert.assertTrue(controller.acquirePermit(CONCURRENT_NS));
-  }
-
-  private void verifyRemainingPermitCounts(int[] remainingPermitCounts, String[] nss,
-      RouterRpcFairnessPolicyController controller) {
-    assert remainingPermitCounts.length == nss.length;
-    for (int i = 0; i < remainingPermitCounts.length; i++) {
-      verifyRemainingPermitCount(remainingPermitCounts[i], nss[i], controller);
-    }
-  }
-
-  private void verifyRemainingPermitCount(int remainingPermitCount, String nameservice,
-      RouterRpcFairnessPolicyController controller) {
-    for (int i = 0; i < remainingPermitCount; i++) {
-      Assert.assertTrue(controller.acquirePermit(nameservice));
-    }
-    Assert.assertFalse(controller.acquirePermit(nameservice));
-  }
-
-  private void injectDummyMetrics(Map<String, LongAdder> metrics, String ns, long value) {
-    metrics.computeIfAbsent(ns, k -> new LongAdder()).add(value);
-  }
-
-  private DynamicRouterRpcFairnessPolicyController getFairnessPolicyController(int handlers,
-      long refreshInterval) {
-    return new DynamicRouterRpcFairnessPolicyController(createConf(handlers, 3), refreshInterval);
-  }
-
-  private DynamicRouterRpcFairnessPolicyController getFairnessPolicyController(int handlers) {
-    return new DynamicRouterRpcFairnessPolicyController(createConf(handlers, 3), Long.MAX_VALUE);
-  }
-
-  private Configuration createConf(int handlers, int minHandlersPerNs) {
-    Configuration conf = new HdfsConfiguration();
-    conf.setInt(DFS_ROUTER_HANDLER_COUNT_KEY, handlers);
-    conf.set(DFS_ROUTER_MONITOR_NAMENODE, nameServices);
-    conf.setInt(DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY, minHandlersPerNs);
-    conf.setClass(RBFConfigKeys.DFS_ROUTER_FAIRNESS_POLICY_CONTROLLER_CLASS,
-        DynamicRouterRpcFairnessPolicyController.class, RouterRpcFairnessPolicyController.class);
-    return conf;
-  }
-}

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/fairness/TestRouterRpcFairnessPolicyController.java

@@ -27,7 +27,6 @@ import org.junit.Test;
 import org.slf4j.LoggerFactory;
 
 import static org.apache.hadoop.hdfs.server.federation.fairness.RouterRpcFairnessConstants.CONCURRENT_NS;
-import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HANDLER_COUNT_KEY;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_MONITOR_NAMENODE;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_FAIR_HANDLER_COUNT_KEY_PREFIX;
@@ -103,14 +102,6 @@ public class TestRouterRpcFairnessPolicyController {
     verifyInstantiationError(conf, 1, 3);
   }
 
-  @Test
-  public void testAllocationErrorTooFewDedicatedHandlers() {
-    Configuration conf = createConf(9);
-    conf.setInt(DFS_ROUTER_FAIR_MINIMUM_HANDLER_COUNT_KEY, 3);
-    conf.setInt(DFS_ROUTER_FAIR_HANDLER_COUNT_KEY_PREFIX + CONCURRENT_NS, 1);
-    verifyInstantiationError(conf, CONCURRENT_NS,  9, 3);
-  }
-
   @Test
   public void testGetAvailableHandlerOnPerNs() {
     RouterRpcFairnessPolicyController routerRpcFairnessPolicyController
@@ -122,18 +113,6 @@ public class TestRouterRpcFairnessPolicyController {
         routerRpcFairnessPolicyController.getAvailableHandlerOnPerNs());
   }
 
-  @Test
-  public void testGetPermitCapacityPerNs() {
-    RouterRpcFairnessPolicyController routerRpcFairnessPolicyController
-        = getFairnessPolicyController(30);
-    assertEquals("{\"concurrent\":10,\"ns2\":10,\"ns1\":10}",
-        routerRpcFairnessPolicyController.getPermitCapacityPerNs());
-    routerRpcFairnessPolicyController.acquirePermit("ns1");
-    routerRpcFairnessPolicyController.acquirePermit("ns2");
-    assertEquals("{\"concurrent\":10,\"ns2\":10,\"ns1\":10}",
-        routerRpcFairnessPolicyController.getPermitCapacityPerNs());
-  }
-
   @Test
   public void testGetAvailableHandlerOnPerNsForNoFairness() {
     Configuration conf = new Configuration();
@@ -191,20 +170,6 @@ public class TestRouterRpcFairnessPolicyController {
         logs.getOutput().contains(errorMsg));
   }
 
-  private void verifyInstantiationError(Configuration conf, String ns, int handlerCount,
-      int minimumHandler) {
-    GenericTestUtils.LogCapturer logs = GenericTestUtils.LogCapturer.captureLogs(
-        LoggerFactory.getLogger(StaticRouterRpcFairnessPolicyController.class));
-    try {
-      FederationUtil.newFairnessPolicyController(conf);
-    } catch (IllegalArgumentException e) {
-      // Ignore the exception as it is expected here.
-    }
-    String errorMsg = String.format(StaticRouterRpcFairnessPolicyController.ERROR_NS_MSG,
-        DFS_ROUTER_FAIR_HANDLER_COUNT_KEY_PREFIX + ns, handlerCount, minimumHandler);
-    assertTrue("Should contain error message: " + errorMsg, logs.getOutput().contains(errorMsg));
-  }
-
   private RouterRpcFairnessPolicyController getFairnessPolicyController(
       int handlers) {
     return FederationUtil.newFairnessPolicyController(createConf(handlers));