/**
* 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.nfs.nfs3;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.oncrpc.RpcProgram;
import org.apache.hadoop.oncrpc.SimpleTcpServer;
import org.apache.hadoop.portmap.PortmapMapping;
import org.apache.hadoop.util.ShutdownHookManager;
import static org.apache.hadoop.util.ExitUtil.terminate;
/**
* Nfs server. Supports NFS v3 using {@link RpcProgram}.
* Currently Mountd program is also started inside this class.
* Only TCP server is supported and UDP is not supported.
*/
public abstract class Nfs3Base {
public static final Log LOG = LogFactory.getLog(Nfs3Base.class);
private final RpcProgram rpcProgram;
private int nfsBoundPort; // Will set after server starts
public RpcProgram getRpcProgram() {
return rpcProgram;
}
protected Nfs3Base(RpcProgram rpcProgram, Configuration conf) {
this.rpcProgram = rpcProgram;
LOG.info("NFS server port set to: " + rpcProgram.getPort());
}
public void start(boolean register) {
startTCPServer(); // Start TCP server
if (register) {
ShutdownHookManager.get().addShutdownHook(new Unregister(),
SHUTDOWN_HOOK_PRIORITY);
try {
rpcProgram.register(PortmapMapping.TRANSPORT_TCP, nfsBoundPort);
} catch (Throwable e) {
LOG.fatal("Failed to start the server. Cause:", e);
terminate(1, e);
}
}
}
private void startTCPServer() {
SimpleTcpServer tcpServer = new SimpleTcpServer(rpcProgram.getPort(),
rpcProgram, 0);
rpcProgram.startDaemons();
tcpServer.run();
nfsBoundPort = tcpServer.getBoundPort();
}
/**
* Priority of the nfsd shutdown hook.
*/
public static final int SHUTDOWN_HOOK_PRIORITY = 10;
private class Unregister implements Runnable {
@Override
public synchronized void run() {
rpcProgram.unregister(PortmapMapping.TRANSPORT_TCP, nfsBoundPort);
}
}
}