| /* |
| * 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.pig.backend.hadoop.executionengine.shims; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapreduce.ContextFactory; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.JobID; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.mapreduce.TaskAttemptID; |
| import org.apache.hadoop.mapreduce.TaskType; |
| import org.apache.hadoop.mapreduce.task.JobContextImpl; |
| import org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl; |
| |
| public class HadoopShims { |
| |
| private static Log LOG = LogFactory.getLog(HadoopShims.class); |
| |
| static public JobContext cloneJobContext(JobContext original) throws IOException, InterruptedException { |
| JobContext newContext = ContextFactory.cloneContext(original, |
| new JobConf(original.getConfiguration())); |
| return newContext; |
| } |
| |
| static public TaskAttemptContext createTaskAttemptContext(Configuration conf, |
| TaskAttemptID taskId) { |
| if (conf instanceof JobConf) { |
| return new TaskAttemptContextImpl(new JobConf(conf), taskId); |
| } else { |
| return new TaskAttemptContextImpl(conf, taskId); |
| } |
| } |
| |
| static public JobContext createJobContext(Configuration conf, |
| JobID jobId) { |
| if (conf instanceof JobConf) { |
| return new JobContextImpl(new JobConf(conf), jobId); |
| } else { |
| return new JobContextImpl(conf, jobId); |
| } |
| } |
| |
| static public boolean isMap(TaskAttemptID taskAttemptID) { |
| TaskType type = taskAttemptID.getTaskType(); |
| if (type==TaskType.MAP) |
| return true; |
| |
| return false; |
| } |
| |
| static public TaskAttemptID getNewTaskAttemptID() { |
| TaskAttemptID taskAttemptID = new TaskAttemptID("", 1, TaskType.MAP, |
| 1, 1); |
| return taskAttemptID; |
| } |
| |
| static public TaskAttemptID createTaskAttemptID(String jtIdentifier, int jobId, boolean isMap, |
| int taskId, int id) { |
| if (isMap) { |
| return new TaskAttemptID(jtIdentifier, jobId, TaskType.MAP, taskId, id); |
| } else { |
| return new TaskAttemptID(jtIdentifier, jobId, TaskType.REDUCE, taskId, id); |
| } |
| } |
| |
| /** |
| * Returns whether the give path has a FileSystem implementation. |
| * |
| * @param path path |
| * @param conf configuration |
| * @return true if the give path's scheme has a FileSystem implementation, |
| * false otherwise |
| */ |
| public static boolean hasFileSystemImpl(Path path, Configuration conf) { |
| String scheme = path.toUri().getScheme(); |
| if (scheme != null) { |
| // Hadoop 0.23 |
| if (conf.get("fs.file.impl") != null) { |
| String fsImpl = conf.get("fs." + scheme + ".impl"); |
| if (fsImpl == null) { |
| return false; |
| } |
| } else { |
| try { |
| Object fs = FileSystem.getFileSystemClass(scheme,conf); |
| return fs == null ? false : true; |
| } catch (Exception e) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| } |