HDFS-11108. Ozone: use containers with the state machine. Contributed by Anu Engineer

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java

@@ -72,7 +72,6 @@ import java.net.Socket;
 import java.net.URI;
 import java.net.UnknownHostException;
 import java.nio.channels.ServerSocketChannel;
-import java.nio.channels.SocketChannel;
 import java.security.PrivilegedExceptionAction;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -116,6 +115,8 @@ import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.HDFSPolicyProvider;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.ozone.container.common.statemachine
+    .DatanodeStateMachine;
 import org.apache.hadoop.util.AutoCloseableLock;
 import org.apache.hadoop.hdfs.client.BlockReportOptions;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
@@ -192,7 +193,6 @@ import org.apache.hadoop.net.DNS;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.net.unix.DomainSocket;
 import org.apache.hadoop.ozone.OzoneConfiguration;
-import org.apache.hadoop.ozone.container.ozoneimpl.OzoneContainer;
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.SaslPropertiesResolver;
 import org.apache.hadoop.security.SecurityUtil;
@@ -396,7 +396,7 @@ public class DataNode extends ReconfigurableBase
   private DiskBalancer diskBalancer;
 
   private final SocketFactory socketFactory;
-  private OzoneContainer ozoneServer;
+  private DatanodeStateMachine datanodeStateMachine;
 
   private static Tracer createTracer(Configuration conf) {
     return new Tracer.Builder("DataNode").
@@ -1615,11 +1615,10 @@ public class DataNode extends ReconfigurableBase
     initDirectoryScanner(getConf());
     if(this.ozoneEnabled) {
       try {
-        ozoneServer = new OzoneContainer(getConf(), this.getFSDataset());
-        ozoneServer.start();
+        datanodeStateMachine = DatanodeStateMachine.initStateMachine(getConf());
         LOG.info("Ozone container server started.");
-      } catch (Exception ex) {
-        LOG.error("Unable to start Ozone. ex: {}", ex.toString());
+      } catch (IOException ex) {
+        LOG.error("Unable to start Ozone. ex: {}", ex);
       }
     }
     initDiskBalancer(data, getConf());
@@ -1975,9 +1974,9 @@ public class DataNode extends ReconfigurableBase
     }
 
     if(this.ozoneEnabled) {
-      if(ozoneServer != null) {
+      if(datanodeStateMachine != null) {
         try {
-          ozoneServer.stop();
+          datanodeStateMachine.close();
         } catch (Exception e) {
           LOG.error("Error is ozone shutdown. ex {}", e.toString());
         }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/container/common/statemachine/DatanodeStateMachine.java

@@ -21,6 +21,7 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ozone.OzoneClientUtils;
 import org.apache.hadoop.ozone.OzoneConfigKeys;
+import org.apache.hadoop.ozone.container.ozoneimpl.OzoneContainer;
 import org.apache.hadoop.util.Time;
 import org.apache.hadoop.util.concurrent.HadoopExecutors;
 import org.slf4j.Logger;
@@ -43,27 +44,26 @@ public class DatanodeStateMachine implements Closeable {
   private final ExecutorService executorService;
   private final Configuration conf;
   private final SCMConnectionManager connectionManager;
-  private final long taskWaitTime;
   private final long heartbeatFrequency;
   private StateContext context;
+  private final OzoneContainer container;
 
   /**
-   * Constructs a container state machine.
+   * Constructs a a datanode state machine.
    *
    * @param conf - Configration.
    */
-  public DatanodeStateMachine(Configuration conf) {
+  public DatanodeStateMachine(Configuration conf) throws IOException {
     this.conf = conf;
     executorService = HadoopExecutors.newScheduledThreadPool(
         this.conf.getInt(OzoneConfigKeys.OZONE_SCM_CONTAINER_THREADS,
             OzoneConfigKeys.OZONE_SCM_CONTAINER_THREADS_DEFAULT),
         new ThreadFactoryBuilder().setDaemon(true)
-            .setNameFormat("Container State Machine Thread - %d").build());
+            .setNameFormat("Datanode State Machine Thread - %d").build());
     connectionManager = new SCMConnectionManager(conf);
     context = new StateContext(this.conf, DatanodeStates.getInitState(), this);
-    taskWaitTime = this.conf.getLong(OzoneConfigKeys.OZONE_CONTAINER_TASK_WAIT,
-        OzoneConfigKeys.OZONE_CONTAINER_TASK_WAIT_DEFAULT);
     heartbeatFrequency = OzoneClientUtils.getScmHeartbeatInterval(conf);
+    container = new OzoneContainer(conf);
   }
 
   /**
@@ -81,10 +81,12 @@ public class DatanodeStateMachine implements Closeable {
   public void start() throws IOException {
     long now = 0;
     long nextHB = 0;
+    container.start();
     while (context.getState() != DatanodeStates.SHUTDOWN) {
       try {
         nextHB = Time.monotonicNow() + heartbeatFrequency;
-        context.execute(executorService, taskWaitTime, TimeUnit.SECONDS);
+        context.execute(executorService, heartbeatFrequency,
+            TimeUnit.MILLISECONDS);
         now = Time.monotonicNow();
         if (now < nextHB) {
           Thread.sleep(nextHB - now);
@@ -144,6 +146,10 @@ public class DatanodeStateMachine implements Closeable {
     for (EndpointStateMachine endPoint : connectionManager.getValues()) {
       endPoint.close();
     }
+
+    if(container != null) {
+      container.stop();
+    }
   }
 
   /**
@@ -159,7 +165,7 @@ public class DatanodeStateMachine implements Closeable {
     /**
      * Constructs ContainerStates.
      *
-     * @param value
+     * @param value  Enum Value
      */
     DatanodeStates(int value) {
       this.value = value;
@@ -210,4 +216,22 @@ public class DatanodeStateMachine implements Closeable {
       return getLastState();
     }
   }
+
+  public static DatanodeStateMachine initStateMachine(Configuration conf)
+      throws IOException {
+    DatanodeStateMachine stateMachine = new DatanodeStateMachine(conf);
+    Runnable startStateMachineTask = () -> {
+      try {
+        stateMachine.start();
+      } catch (Exception ex) {
+        LOG.error("Unable to start the DatanodeState Machine", ex);
+      }
+    };
+    Thread thread =  new ThreadFactoryBuilder()
+        .setDaemon(true)
+        .setNameFormat("Datanode State Machine Thread - %d")
+        .build().newThread(startStateMachineTask);
+    thread.start();
+    return stateMachine;
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/container/common/transport/server/XceiverServer.java

@@ -30,6 +30,8 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ozone.OzoneConfigKeys;
 import org.apache.hadoop.ozone.container.common.interfaces.ContainerDispatcher;
 
+import java.io.IOException;
+
 /**
  * Creates a netty server endpoint that acts as the communication layer for
  * Ozone containers.
@@ -58,9 +60,9 @@ public final class XceiverServer {
   /**
    * Starts running the server.
    *
-   * @throws Exception
+   * @throws IOException
    */
-  public void start() throws Exception {
+  public void start() throws IOException {
     bossGroup = new NioEventLoopGroup();
     workerGroup = new NioEventLoopGroup();
     channel = new ServerBootstrap()

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/container/ozoneimpl/OzoneContainer.java

@@ -5,9 +5,9 @@
  * 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/>
+ * <p>
  * http://www.apache.org/licenses/LICENSE-2.0
- * <p/>
+ * <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
@@ -19,8 +19,6 @@ package org.apache.hadoop.ozone.container.ozoneimpl;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
-import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
-import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
 import org.apache.hadoop.ozone.OzoneConfigKeys;
 import org.apache.hadoop.ozone.container.common.impl.ChunkManagerImpl;
 import org.apache.hadoop.ozone.container.common.impl.ContainerManagerImpl;
@@ -38,6 +36,8 @@ import java.io.IOException;
 import java.util.LinkedList;
 import java.util.List;
 
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_DATA_DIR_KEY;
+
 /**
  * Ozone main class sets up the network server and initializes the container
  * layer.
@@ -57,12 +57,11 @@ public class OzoneContainer {
    * Creates a network endpoint and enables Ozone container.
    *
    * @param ozoneConfig - Config
-   * @param dataSet     - FsDataset.
    * @throws IOException
    */
   public OzoneContainer(
-      Configuration ozoneConfig,
-      FsDatasetSpi<? extends FsVolumeSpi> dataSet) throws Exception {
+      Configuration ozoneConfig) throws IOException {
+    this.ozoneConfig = ozoneConfig;
     List<StorageLocation> locations = new LinkedList<>();
     String[] paths = ozoneConfig.getStrings(
         OzoneConfigKeys.OZONE_CONTAINER_METADATA_DIRS);
@@ -71,11 +70,9 @@ public class OzoneContainer {
         locations.add(StorageLocation.parse(p));
       }
     } else {
-      getDataDir(dataSet, locations);
+      getDataDir(locations);
     }
 
-    this.ozoneConfig = ozoneConfig;
-
     manager = new ContainerManagerImpl();
     manager.init(this.ozoneConfig, locations);
     this.chunkManager = new ChunkManagerImpl(manager);
@@ -90,43 +87,44 @@ public class OzoneContainer {
 
   /**
    * Starts serving requests to ozone container.
-   * @throws Exception
+   *
+   * @throws IOException
    */
-  public void start() throws Exception {
+  public void start() throws IOException {
     server.start();
   }
 
   /**
    * Stops the ozone container.
-   *
-   * Shutdown logic is not very obvious from the following code.
-   * if you need to  modify the logic, please keep these comments in mind.
-   * Here is the shutdown sequence.
-   *
+   * <p>
+   * Shutdown logic is not very obvious from the following code. if you need to
+   * modify the logic, please keep these comments in mind. Here is the shutdown
+   * sequence.
+   * <p>
    * 1. We shutdown the network ports.
-   *
+   * <p>
    * 2. Now we need to wait for all requests in-flight to finish.
-   *
-   * 3. The container manager lock is a read-write lock with "Fairness" enabled.
-   *
+   * <p>
+   * 3. The container manager lock is a read-write lock with "Fairness"
+   * enabled.
+   * <p>
    * 4. This means that the waiting threads are served in a "first-come-first
    * -served" manner. Please note that this applies to waiting threads only.
-   *
+   * <p>
    * 5. Since write locks are exclusive, if we are waiting to get a lock it
    * implies that we are waiting for in-flight operations to complete.
-   *
+   * <p>
    * 6. if there are other write operations waiting on the reader-writer lock,
    * fairness guarantees that they will proceed before the shutdown lock
    * request.
-   *
+   * <p>
    * 7. Since all operations either take a reader or writer lock of container
    * manager, we are guaranteed that we are the last operation since we have
    * closed the network port, and we wait until close is successful.
-   *
+   * <p>
    * 8. We take the writer lock and call shutdown on each of the managers in
    * reverse order. That is chunkManager, keyManager and containerManager is
    * shutdown.
-   *
    */
   public void stop() {
     LOG.info("Attempting to stop container services.");
@@ -144,26 +142,14 @@ public class OzoneContainer {
 
   /**
    * Returns a paths to data dirs.
-   * @param dataset - FSDataset.
+   *
    * @param pathList - List of paths.
    * @throws IOException
    */
-  private void getDataDir(
-      FsDatasetSpi<? extends FsVolumeSpi> dataset,
-      List<StorageLocation> pathList) throws IOException {
-    FsDatasetSpi.FsVolumeReferences references;
-    try {
-      synchronized (dataset) {
-        references = dataset.getFsVolumeReferences();
-        for (int ndx = 0; ndx < references.size(); ndx++) {
-          FsVolumeSpi vol = references.get(ndx);
-          pathList.add(StorageLocation.parse(vol.getBaseURI().getPath()));
-        }
-        references.close();
-      }
-    } catch (IOException ex) {
-      LOG.error("Unable to get volume paths.", ex);
-      throw new IOException("Internal error", ex);
+  private void getDataDir(List<StorageLocation> pathList) throws IOException {
+    for (String dir : ozoneConfig.getStrings(DFS_DATANODE_DATA_DIR_KEY)) {
+      StorageLocation location = StorageLocation.parse(dir);
+      pathList.add(location);
     }
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/ozone/container/common/TestDatanodeStateMachine.java

@@ -20,19 +20,12 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.ozone.OzoneConfigKeys;
-import org.apache.hadoop.ozone.container.common.statemachine
-    .DatanodeStateMachine;
-
-import org.apache.hadoop.ozone.container.common.statemachine
-    .EndpointStateMachine;
-import org.apache.hadoop.ozone.container.common.statemachine
-    .SCMConnectionManager;
-
+import org.apache.hadoop.ozone.container.common.statemachine.DatanodeStateMachine;
+import org.apache.hadoop.ozone.container.common.statemachine.EndpointStateMachine;
+import org.apache.hadoop.ozone.container.common.statemachine.SCMConnectionManager;
 import org.apache.hadoop.ozone.container.common.states.DatanodeState;
-import org.apache.hadoop.ozone.container.common.states.datanode
-    .InitDatanodeState;
-import org.apache.hadoop.ozone.container.common.states.datanode
-    .RunningDatanodeState;
+import org.apache.hadoop.ozone.container.common.states.datanode.InitDatanodeState;
+import org.apache.hadoop.ozone.container.common.states.datanode.RunningDatanodeState;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.util.concurrent.HadoopExecutors;
 import org.junit.After;
@@ -54,18 +47,20 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_DATA_DIR_KEY;
+
 /**
  * Tests the datanode state machine class and its states.
  */
 public class TestDatanodeStateMachine {
+  private static final Logger LOG =
+      LoggerFactory.getLogger(TestDatanodeStateMachine.class);
   private final int scmServerCount = 3;
   private List<String> serverAddresses;
   private List<RPC.Server> scmServers;
   private List<ScmTestMock> mockServers;
   private ExecutorService executorService;
   private Configuration conf;
-  private static final Logger LOG =
-      LoggerFactory.getLogger(TestDatanodeStateMachine.class);
 
   @Before
   public void setUp() throws Exception {
@@ -91,14 +86,15 @@ public class TestDatanodeStateMachine {
     String path = p.getPath().concat(
         TestDatanodeStateMachine.class.getSimpleName());
     File f = new File(path);
-    if(!f.mkdirs()) {
+    if (!f.mkdirs()) {
       LOG.info("Required directories already exist.");
     }
-
+    conf.set(DFS_DATANODE_DATA_DIR_KEY, path);
     path = Paths.get(path.toString(),
         TestDatanodeStateMachine.class.getSimpleName() + ".id").toString();
     conf.set(OzoneConfigKeys.OZONE_SCM_DATANODE_ID, path);
 
+
     executorService = HadoopExecutors.newScheduledThreadPool(
         conf.getInt(
             OzoneConfigKeys.OZONE_SCM_CONTAINER_THREADS,
@@ -122,7 +118,6 @@ public class TestDatanodeStateMachine {
   /**
    * Assert that starting statemachine executes the Init State.
    *
-   * @throws IOException
    * @throws InterruptedException
    */
   @Test
@@ -132,7 +127,7 @@ public class TestDatanodeStateMachine {
     Runnable startStateMachineTask = () -> {
       try {
         stateMachine.start();
-      } catch (IOException ex) {
+      } catch (Exception ex) {
       }
     };
     Thread thread1 = new Thread(startStateMachineTask);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/ozone/container/ozoneimpl/TestOzoneContainer.java

@@ -32,6 +32,9 @@ import org.junit.rules.Timeout;
 
 import java.net.URL;
 
+/**
+ * Tests ozone containers.
+ */
 public class TestOzoneContainer {
   /**
    * Set the timeout for every test.
@@ -55,12 +58,11 @@ public class TestOzoneContainer {
 
     // We don't start Ozone Container via data node, we will do it
     // independently in our test path.
-    Pipeline pipeline = ContainerTestHelper.createSingleNodePipeline
-        (containerName);
+    Pipeline pipeline = ContainerTestHelper.createSingleNodePipeline(
+        containerName);
     conf.setInt(OzoneConfigKeys.DFS_CONTAINER_IPC_PORT,
         pipeline.getLeader().getContainerPort());
-    OzoneContainer container = new OzoneContainer(conf, cluster.getDataNodes
-        ().get(0).getFSDataset());
+    OzoneContainer container = new OzoneContainer(conf);
     container.start();
 
     XceiverClient client = new XceiverClient(pipeline, conf);