/**
* 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);
}
}