hadoop PrivilegedNfsGatewayStarter 源码

haddop PrivilegedNfsGatewayStarter 代码

文件路径：/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/PrivilegedNfsGatewayStarter.java

/**
 * 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.hdfs.nfs.nfs3;

import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.hdfs.nfs.conf.NfsConfigKeys;
import org.apache.hadoop.hdfs.nfs.conf.NfsConfiguration;

/**
 * This class is used to allow the initial registration of the NFS gateway with
 * the system portmap daemon to come from a privileged (< 1024) port. This is
 * necessary on certain operating systems to work around this bug in rpcbind:
 * 
 * Red Hat: https://bugzilla.redhat.com/show_bug.cgi?id=731542
 * SLES: https://bugzilla.novell.com/show_bug.cgi?id=823364
 * Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=594880
 */
public class PrivilegedNfsGatewayStarter implements Daemon {
  static final Logger LOG =
      LoggerFactory.getLogger(PrivilegedNfsGatewayStarter.class);
  private String[] args = null;
  private DatagramSocket registrationSocket = null;
  private Nfs3 nfs3Server = null;

  @Override
  public void init(DaemonContext context) throws Exception {
    System.err.println("Initializing privileged NFS client socket...");
    NfsConfiguration conf = new NfsConfiguration();
    int clientPort = conf.getInt(NfsConfigKeys.DFS_NFS_REGISTRATION_PORT_KEY,
        NfsConfigKeys.DFS_NFS_REGISTRATION_PORT_DEFAULT);
    if (clientPort < 1 || clientPort > 1023) {
      throw new RuntimeException("Must start privileged NFS server with '" +
          NfsConfigKeys.DFS_NFS_REGISTRATION_PORT_KEY + "' configured to a " +
          "privileged port.");
    }

    try {
      InetSocketAddress socketAddress =
                new InetSocketAddress("localhost", clientPort);
      registrationSocket = new DatagramSocket(null);
      registrationSocket.setReuseAddress(true);
      registrationSocket.bind(socketAddress);
    } catch (SocketException e) {
      LOG.error("Init failed for port=" + clientPort, e);
      throw e;
    }
    args = context.getArguments();
  }

  @Override
  public void start() throws Exception {
    nfs3Server = Nfs3.startService(args, registrationSocket);
  }

  @Override
  public void stop() throws Exception {
    if (nfs3Server != null) {
      nfs3Server.stop();
    }
  }

  @Override
  public void destroy() {
    if (registrationSocket != null && !registrationSocket.isClosed()) {
      registrationSocket.close();
    }
  }

}

相关信息

hadoop 源码目录

相关文章

hadoop AsyncDataService 源码

hadoop DFSClientCache 源码

hadoop Nfs3 源码

hadoop Nfs3HttpServer 源码

hadoop Nfs3Metrics 源码

hadoop Nfs3Utils 源码

hadoop OffsetRange 源码

hadoop OpenFileCtx 源码

hadoop OpenFileCtxCache 源码

hadoop RpcProgramNfs3 源码