HADOOP-9194. RPC Support for QoS. (Junping Du via llu)

Merged from trunk@1461370.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1477388 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -6,6 +6,8 @@ Release 2.0.5-beta - UNRELEASED
 
   NEW FEATURES
 
+    HADOOP-9194. RPC support for QoS. (Junping Du via llu)
+
     HADOOP-9283. Add support for running the Hadoop client on AIX. (atm)
 
     HADOOP-8415. Add getDouble() and setDouble() in 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java

@@ -256,6 +256,7 @@ public class Client {
     private final ConnectionId remoteId;                // connection id
     private AuthMethod authMethod; // authentication method
     private Token<? extends TokenIdentifier> token;
+    private int serviceClass;
     private SaslRpcClient saslRpcClient;
     
     private Socket socket = null;                 // connected socket
@@ -278,7 +279,7 @@ public class Client {
     
     private final Object sendParamsLock = new Object();
 
-    public Connection(ConnectionId remoteId) throws IOException {
+    public Connection(ConnectionId remoteId, int serviceClass) throws IOException {
       this.remoteId = remoteId;
       this.server = remoteId.getAddress();
       if (server.isUnresolved()) {
@@ -295,6 +296,7 @@ public class Client {
       this.tcpNoDelay = remoteId.getTcpNoDelay();
       this.doPing = remoteId.getDoPing();
       this.pingInterval = remoteId.getPingInterval();
+      this.serviceClass = serviceClass;
       if (LOG.isDebugEnabled()) {
         LOG.debug("The ping interval is " + this.pingInterval + " ms.");
       }
@@ -740,7 +742,9 @@ public class Client {
      * +----------------------------------+
      * |  "hrpc" 4 bytes                  |      
      * +----------------------------------+
-     * |  Version (1 bytes)               |      
+     * |  Version (1 byte)                |
+     * +----------------------------------+
+     * |  Service Class (1 byte)          |
      * +----------------------------------+
      * |  Authmethod (1 byte)             |      
      * +----------------------------------+
@@ -753,6 +757,7 @@ public class Client {
       // Write out the header, version and authentication method
       out.write(Server.HEADER.array());
       out.write(Server.CURRENT_VERSION);
+      out.write(serviceClass);
       authMethod.write(out);
       Server.IpcSerializationType.PROTOBUF.write(out);
       out.flush();
@@ -1157,6 +1162,20 @@ public class Client {
     return call(RPC.RpcKind.RPC_BUILTIN, param, remoteId);
   }
   
+  /**
+   * Same as {@link #call(Writable, InetSocketAddress,
+   * Class, UserGroupInformation, int, Configuration)}
+   * except that specifying serviceClass.
+   */
+  public Writable call(Writable param, InetSocketAddress addr,
+      Class<?> protocol, UserGroupInformation ticket,
+      int rpcTimeout, int serviceClass, Configuration conf)
+      throws InterruptedException, IOException {
+    ConnectionId remoteId = ConnectionId.getConnectionId(addr, protocol,
+        ticket, rpcTimeout, conf);
+    return call(RPC.RpcKind.RPC_BUILTIN, param, remoteId, serviceClass);
+  }
+
   /**
    * Make a call, passing <code>param</code>, to the IPC server running at
    * <code>address</code> which is servicing the <code>protocol</code> protocol,
@@ -1196,8 +1215,26 @@ public class Client {
    */
   public Writable call(RPC.RpcKind rpcKind, Writable rpcRequest,
       ConnectionId remoteId) throws InterruptedException, IOException {
+    return call(rpcKind, rpcRequest, remoteId, RPC.RPC_SERVICE_CLASS_DEFAULT);
+  }
+
+  /** 
+   * Make a call, passing <code>rpcRequest</code>, to the IPC server defined by
+   * <code>remoteId</code>, returning the rpc respond.
+   * 
+   * @param rpcKind
+   * @param rpcRequest -  contains serialized method and method parameters
+   * @param remoteId - the target rpc server
+   * @param serviceClass - service class for RPC
+   * @returns the rpc response
+   * Throws exceptions if there are network problems or if the remote code 
+   * threw an exception.
+   */
+  public Writable call(RPC.RpcKind rpcKind, Writable rpcRequest,
+      ConnectionId remoteId, int serviceClass)
+      throws InterruptedException, IOException {
     Call call = new Call(rpcKind, rpcRequest);
-    Connection connection = getConnection(remoteId, call);
+    Connection connection = getConnection(remoteId, call, serviceClass);
     try {
       connection.sendParam(call);                 // send the parameter
     } catch (RejectedExecutionException e) {
@@ -1254,7 +1291,7 @@ public class Client {
   /** Get a connection from the pool, or create a new one and add it to the
    * pool.  Connections to a given ConnectionId are reused. */
   private Connection getConnection(ConnectionId remoteId,
-                                   Call call)
+                                   Call call, int serviceClass)
                                    throws IOException, InterruptedException {
     if (!running.get()) {
       // the client is stopped
@@ -1269,7 +1306,7 @@ public class Client {
       synchronized (connections) {
         connection = connections.get(remoteId);
         if (connection == null) {
-          connection = new Connection(remoteId);
+          connection = new Connection(remoteId, serviceClass);
           connections.put(remoteId, connection);
         }
       }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/RPC.java

@@ -73,12 +73,12 @@ import com.google.protobuf.BlockingService;
  * the protocol instance is transmitted.
  */
 public class RPC {
+  final static int RPC_SERVICE_CLASS_DEFAULT = 0;
   public enum RpcKind {
     RPC_BUILTIN ((short) 1),         // Used for built in calls by tests
     RPC_WRITABLE ((short) 2),        // Use WritableRpcEngine 
     RPC_PROTOCOL_BUFFER ((short) 3); // Use ProtobufRpcEngine
     final static short MAX_INDEX = RPC_PROTOCOL_BUFFER.value; // used for array size
-    private static final short FIRST_INDEX = RPC_BUILTIN.value;    
     public final short value; //TODO make it private
 
     RpcKind(short val) {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java

@@ -431,6 +431,11 @@ public abstract class Server {
     return Arrays.asList(handlers);
   }
 
+  @VisibleForTesting
+  List<Connection> getConnections() {
+    return connectionList;
+  }
+
   /**
    * Refresh the service authorization ACL for the service handled by this server.
    */
@@ -1097,6 +1102,7 @@ public abstract class Server {
     private ByteBuffer connectionHeaderBuf = null;
     private ByteBuffer unwrappedData;
     private ByteBuffer unwrappedDataLengthBuffer;
+    private int serviceClass;
     
     UserGroupInformation user = null;
     public UserGroupInformation attemptingUser = null; // user name before auth
@@ -1308,14 +1314,17 @@ public abstract class Server {
         if (!connectionHeaderRead) {
           //Every connection is expected to send the header.
           if (connectionHeaderBuf == null) {
-            connectionHeaderBuf = ByteBuffer.allocate(3);
+            connectionHeaderBuf = ByteBuffer.allocate(4);
           }
           count = channelRead(channel, connectionHeaderBuf);
           if (count < 0 || connectionHeaderBuf.remaining() > 0) {
             return count;
           }
           int version = connectionHeaderBuf.get(0);
-          byte[] method = new byte[] {connectionHeaderBuf.get(1)};
+          // TODO we should add handler for service class later
+          this.setServiceClass(connectionHeaderBuf.get(1));
+
+          byte[] method = new byte[] {connectionHeaderBuf.get(2)};
           authMethod = AuthMethod.read(new DataInputStream(
               new ByteArrayInputStream(method)));
           dataLengthBuffer.flip();
@@ -1339,7 +1348,7 @@ public abstract class Server {
           }
           
           IpcSerializationType serializationType = IpcSerializationType
-              .fromByte(connectionHeaderBuf.get(2));
+              .fromByte(connectionHeaderBuf.get(3));
           if (serializationType != IpcSerializationType.PROTOBUF) {
             respondUnsupportedSerialization(serializationType);
             return -1;
@@ -1723,6 +1732,22 @@ public abstract class Server {
       return true;
     }
     
+    /**
+     * Get service class for connection
+     * @return the serviceClass
+     */
+    public int getServiceClass() {
+      return serviceClass;
+    }
+
+    /**
+     * Set service class for connection
+     * @param serviceClass the serviceClass to set
+     */
+    public void setServiceClass(int serviceClass) {
+      this.serviceClass = serviceClass;
+    }
+
     private synchronized void close() throws IOException {
       disposeSasl();
       data = null;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestIPC.java

@@ -25,6 +25,7 @@ import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.io.IntWritable;
 import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.ipc.Server.Connection;
 import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.net.ConnectTimeoutException;
 import org.apache.hadoop.net.NetUtils;
@@ -520,11 +521,53 @@ public class TestIPC {
     }
   }
   
+  /**
+   * Check service class byte in IPC header is correct on wire.
+   */
+  @Test(timeout=60000)
+  public void testIpcWithServiceClass() throws Exception {
+    // start server
+    Server server = new TestServer(5, false);
+    InetSocketAddress addr = NetUtils.getConnectAddress(server);
+    server.start();
+
+    // start client
+    Client.setConnectTimeout(conf, 10000);
+
+    callAndVerify(server, addr, 0, true);
+    // Service Class is low to -128 as byte on wire.
+    // -128 shouldn't be casted on wire but -129 should.
+    callAndVerify(server, addr, -128, true);
+    callAndVerify(server, addr, -129, false);
+
+    // Service Class is up to 127.
+    // 127 shouldn't be casted on wire but 128 should.
+    callAndVerify(server, addr, 127, true);
+    callAndVerify(server, addr, 128, false);
+
+    server.stop();
+  }
+
+  /**
+   * Make a call from a client and verify if header info is changed in server side
+   */
+  private void callAndVerify(Server server, InetSocketAddress addr,
+      int serviceClass, boolean noChanged) throws Exception{
+    Client client = new Client(LongWritable.class, conf);
+
+    client.call(new LongWritable(RANDOM.nextLong()),
+        addr, null, null, MIN_SLEEP_TIME, serviceClass, conf);
+    Connection connection = server.getConnections().get(0);
+    int serviceClass2 = connection.getServiceClass();
+    assertFalse(noChanged ^ serviceClass == serviceClass2);
+    client.stop();
+  }
+
   /**
    * Check that file descriptors aren't leaked by starting
    * and stopping IPC servers.
    */
-  @Test
+  @Test(timeout=60000)
   public void testSocketLeak() throws Exception {
     Assume.assumeTrue(FD_DIR.exists()); // only run on Linux