| /** |
| * 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 |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * 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.mount; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.oncrpc.RpcProgram; |
| import org.apache.hadoop.oncrpc.SimpleTcpServer; |
| import org.apache.hadoop.oncrpc.SimpleUdpServer; |
| import org.apache.hadoop.portmap.PortmapMapping; |
| import org.apache.hadoop.util.ShutdownHookManager; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static org.apache.hadoop.util.ExitUtil.terminate; |
| |
| /** |
| * Main class for starting mountd daemon. This daemon implements the NFS |
| * mount protocol. When receiving a MOUNT request from an NFS client, it checks |
| * the request against the list of currently exported file systems. If the |
| * client is permitted to mount the file system, rpc.mountd obtains a file |
| * handle for requested directory and returns it to the client. |
| */ |
| abstract public class MountdBase { |
| public static final Logger LOG = LoggerFactory.getLogger(MountdBase.class); |
| private final RpcProgram rpcProgram; |
| private int udpBoundPort; // Will set after server starts |
| private int tcpBoundPort; // Will set after server starts |
| |
| public RpcProgram getRpcProgram() { |
| return rpcProgram; |
| } |
| |
| /** |
| * Constructor |
| * @param program rpc server which handles mount request |
| * @throws IOException fail to construct MountdBase |
| */ |
| public MountdBase(RpcProgram program) throws IOException { |
| rpcProgram = program; |
| } |
| |
| /* Start UDP server */ |
| private void startUDPServer() { |
| SimpleUdpServer udpServer = new SimpleUdpServer(rpcProgram.getPort(), |
| rpcProgram, 1); |
| rpcProgram.startDaemons(); |
| try { |
| udpServer.run(); |
| } catch (Throwable e) { |
| LOG.error("Failed to start the UDP server.", e); |
| if (udpServer.getBoundPort() > 0) { |
| rpcProgram.unregister(PortmapMapping.TRANSPORT_UDP, |
| udpServer.getBoundPort()); |
| } |
| udpServer.shutdown(); |
| terminate(1, e); |
| } |
| udpBoundPort = udpServer.getBoundPort(); |
| } |
| |
| /* Start TCP server */ |
| private void startTCPServer() { |
| SimpleTcpServer tcpServer = new SimpleTcpServer(rpcProgram.getPort(), |
| rpcProgram, 1); |
| rpcProgram.startDaemons(); |
| try { |
| tcpServer.run(); |
| } catch (Throwable e) { |
| LOG.error("Failed to start the TCP server.", e); |
| if (tcpServer.getBoundPort() > 0) { |
| rpcProgram.unregister(PortmapMapping.TRANSPORT_TCP, |
| tcpServer.getBoundPort()); |
| } |
| tcpServer.shutdown(); |
| terminate(1, e); |
| } |
| tcpBoundPort = tcpServer.getBoundPort(); |
| } |
| |
| public void start(boolean register) { |
| startUDPServer(); |
| startTCPServer(); |
| if (register) { |
| ShutdownHookManager.get().addShutdownHook(new Unregister(), |
| SHUTDOWN_HOOK_PRIORITY); |
| try { |
| rpcProgram.register(PortmapMapping.TRANSPORT_UDP, udpBoundPort); |
| rpcProgram.register(PortmapMapping.TRANSPORT_TCP, tcpBoundPort); |
| } catch (Throwable e) { |
| LOG.error("Failed to register the MOUNT service.", e); |
| terminate(1, e); |
| } |
| } |
| } |
| |
| /** |
| * Priority of the mountd shutdown hook. |
| */ |
| public static final int SHUTDOWN_HOOK_PRIORITY = 10; |
| |
| private class Unregister implements Runnable { |
| @Override |
| public synchronized void run() { |
| rpcProgram.unregister(PortmapMapping.TRANSPORT_UDP, udpBoundPort); |
| rpcProgram.unregister(PortmapMapping.TRANSPORT_TCP, tcpBoundPort); |
| } |
| } |
| |
| } |