| /** |
| * 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.server.federation.router; |
| |
| import static org.apache.hadoop.util.ExitUtil.terminate; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.DFSUtil; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.service.CompositeService.CompositeServiceShutdownHook; |
| import org.apache.hadoop.util.ShutdownHookManager; |
| import org.apache.hadoop.util.StringUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Tool to start the {@link Router} for Router-based federation. |
| */ |
| public final class DFSRouter { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(DFSRouter.class); |
| |
| |
| /** Usage string for help message. */ |
| private static final String USAGE = "Usage: hdfs dfsrouter"; |
| |
| /** Priority of the Router shutdown hook. */ |
| public static final int SHUTDOWN_HOOK_PRIORITY = 30; |
| |
| |
| private DFSRouter() { |
| // This is just a class to trigger the Router |
| } |
| |
| /** |
| * Main run loop for the router. |
| * |
| * @param argv parameters. |
| */ |
| public static void main(String[] argv) { |
| if (DFSUtil.parseHelpArgument(argv, USAGE, System.out, true)) { |
| System.exit(0); |
| } |
| |
| try { |
| StringUtils.startupShutdownMessage(Router.class, argv, LOG); |
| |
| Router router = new Router(); |
| |
| ShutdownHookManager.get().addShutdownHook( |
| new CompositeServiceShutdownHook(router), SHUTDOWN_HOOK_PRIORITY); |
| |
| Configuration conf = new HdfsConfiguration(); |
| router.init(conf); |
| router.start(); |
| } catch (Throwable e) { |
| LOG.error("Failed to start router", e); |
| terminate(1, e); |
| } |
| } |
| } |