| /** |
| * 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.tools.mapred; |
| |
| import org.apache.hadoop.tools.util.RetriableCommand; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.mapreduce.Mapper; |
| |
| /** |
| * This class extends Retriable command to implement the creation of directories |
| * with retries on failure. |
| */ |
| public class RetriableDirectoryCreateCommand extends RetriableCommand { |
| |
| /** |
| * Constructor, taking a description of the action. |
| * @param description Verbose description of the copy operation. |
| */ |
| public RetriableDirectoryCreateCommand(String description) { |
| super(description); |
| } |
| |
| /** |
| * Implementation of RetriableCommand::doExecute(). |
| * This implements the actual mkdirs() functionality. |
| * @param arguments Argument-list to the command. |
| * @return Boolean. True, if the directory could be created successfully. |
| * @throws Exception IOException, on failure to create the directory. |
| */ |
| @Override |
| protected Object doExecute(Object... arguments) throws Exception { |
| assert arguments.length == 2 : "Unexpected argument list."; |
| Path target = (Path)arguments[0]; |
| Mapper.Context context = (Mapper.Context)arguments[1]; |
| |
| FileSystem targetFS = target.getFileSystem(context.getConfiguration()); |
| return targetFS.mkdirs(target); |
| } |
| } |