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Subject [GitHub] [hadoop] nandakumar131 commented on a change in pull request #620: HDDS-1205. Refactor ReplicationManager to handle QUASI_CLOSED contain…
Date Tue, 19 Mar 2019 19:59:41 GMT
nandakumar131 commented on a change in pull request #620: HDDS-1205. Refactor ReplicationManager
to handle QUASI_CLOSED contain…
URL: https://github.com/apache/hadoop/pull/620#discussion_r267072062
 
 

 ##########
 File path: hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/ReplicationManager.java
 ##########
 @@ -0,0 +1,686 @@
+/**
+ * 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.hdds.scm.container;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdds.protocol.DatanodeDetails;
+import org.apache.hadoop.hdds.protocol.proto.HddsProtos.LifeCycleState;
+import org.apache.hadoop.hdds.protocol.proto
+    .StorageContainerDatanodeProtocolProtos.ContainerReplicaProto.State;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import org.apache.hadoop.hdds.scm.container.placement.algorithms
+    .ContainerPlacementPolicy;
+import org.apache.hadoop.hdds.scm.events.SCMEvents;
+import org.apache.hadoop.hdds.server.events.EventPublisher;
+import org.apache.hadoop.ozone.lock.LockManager;
+import org.apache.hadoop.ozone.protocol.commands.CloseContainerCommand;
+import org.apache.hadoop.ozone.protocol.commands.CommandForDatanode;
+import org.apache.hadoop.ozone.protocol.commands.DeleteContainerCommand;
+import org.apache.hadoop.ozone.protocol.commands.ReplicateContainerCommand;
+import org.apache.hadoop.util.ExitUtil;
+import org.apache.hadoop.util.Time;
+import org.apache.ratis.util.Preconditions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+/**
+ * Replication Manager (RM) is the one which is responsible for making sure
+ * that the containers are properly replicated. Replication Manager deals only
+ * with Quasi Closed / Closed container.
+ */
+public class ReplicationManager {
+
+  private static final Logger LOG =
+      LoggerFactory.getLogger(ReplicationManager.class);
+
+  /**
+   * Reference to the ContainerManager.
+   */
+  private final ContainerManager containerManager;
+
+  /**
+   * PlacementPolicy which is used to identify where a container
+   * should be copied.
+   */
+  private final ContainerPlacementPolicy containerPlacement;
+
+  /**
+   * EventPublisher to fire Replicate and Delete container commands.
+   */
+  private final EventPublisher eventPublisher;
+
+  /**
+   * Used for locking a container with its ID while processing it.
+   */
+  private final LockManager<ContainerID> lockManager;
+
+  /**
+   * This is used to track container replication commands which are issued
+   * by ReplicationManager and not yet complete.
+   */
+  private final Map<ContainerID, List<InflightAction>> inflightReplication;
+
+  /**
+   * This is used to track container deletion commands which are issued
+   * by ReplicationManager and not yet complete.
+   */
+  private final Map<ContainerID, List<InflightAction>> inflightDeletion;
+
+  /**
+   * ReplicationMonitor thread is the one which wakes up at configured
+   * interval and processes all the containers.
+   */
+  private final Thread replicationMonitor;
+
+  /**
+   * The frequency in which ReplicationMonitor thread should run.
+   */
+  private final long interval;
+
+  /**
+   * Timeout for container replication & deletion command issued by
+   * ReplicationManager.
+   */
+  private final long eventTimeout;
+
+  /**
+   * Flag used to check if ReplicationMonitor thread is running or not.
+   */
+  private volatile boolean running;
+
+  /**
+   * Constructs ReplicationManager instance with the given configuration.
+   *
+   * @param conf OzoneConfiguration
+   * @param containerManager ContainerManager
+   * @param containerPlacement ContainerPlacementPolicy
+   * @param eventPublisher EventPublisher
+   */
+  public ReplicationManager(final Configuration conf,
+                            final ContainerManager containerManager,
+                            final ContainerPlacementPolicy containerPlacement,
+                            final EventPublisher eventPublisher) {
+    this.containerManager = containerManager;
+    this.containerPlacement = containerPlacement;
+    this.eventPublisher = eventPublisher;
+    this.lockManager = new LockManager<>(conf);
+    this.inflightReplication = new HashMap<>();
+    this.inflightDeletion = new HashMap<>();
+    this.replicationMonitor = new Thread(this::run);
+    this.replicationMonitor.setName("ReplicationMonitor");
+    this.interval = conf.getTimeDuration(
+        ScmConfigKeys.HDDS_SCM_REPLICATION_THREAD_INTERVAL,
+        ScmConfigKeys.HDDS_SCM_REPLICATION_THREAD_INTERVAL_DEFAULT,
+        TimeUnit.MILLISECONDS);
+    this.eventTimeout = conf.getTimeDuration(
+        ScmConfigKeys.HDDS_SCM_REPLICATION_EVENT_TIMEOUT,
+        ScmConfigKeys.HDDS_SCM_REPLICATION_EVENT_TIMEOUT_DEFAULT,
+        TimeUnit.MILLISECONDS);
+    this.running = false;
+  }
+
+  /**
+   * Starts Replication Monitor thread.
+   */
+  public void start() {
+    LOG.info("Starting Replication Monitor Thread.");
+    running = true;
+    replicationMonitor.start();
+  }
+
+  /**
+   * Process all the containers immediately.
+   */
+  @VisibleForTesting
+  void processContainersNow() {
+    containerManager.getContainerIDs()
+        .parallelStream().forEach(this::processContainer);
+  }
+
+  /**
+   * Stops Replication Monitor thread.
+   */
+  public void stop() {
 
 Review comment:
   Done

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