| /** |
| * 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.mapreduce; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.permission.FsPermission; |
| import org.apache.hadoop.security.UserGroupInformation; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| /** |
| * A utility to manage job submission files. |
| */ |
| @InterfaceAudience.Private |
| public class JobSubmissionFiles { |
| |
| // job submission directory is private! |
| final public static FsPermission JOB_DIR_PERMISSION = |
| FsPermission.createImmutable((short) 0700); // rwx-------- |
| //job files are world-wide readable and owner writable |
| final public static FsPermission JOB_FILE_PERMISSION = |
| FsPermission.createImmutable((short) 0644); // rw-r--r-- |
| |
| public static Path getJobSplitFile(Path jobSubmissionDir) { |
| return new Path(jobSubmissionDir, "job.split"); |
| } |
| |
| public static Path getJobSplitMetaFile(Path jobSubmissionDir) { |
| return new Path(jobSubmissionDir, "job.splitmetainfo"); |
| } |
| |
| /** |
| * Get the job conf path. |
| */ |
| public static Path getJobConfPath(Path jobSubmitDir) { |
| return new Path(jobSubmitDir, "job.xml"); |
| } |
| |
| /** |
| * Get the job jar path. |
| */ |
| public static Path getJobJar(Path jobSubmitDir) { |
| return new Path(jobSubmitDir, "job.jar"); |
| } |
| |
| /** |
| * Get the job distributed cache files path. |
| * @param jobSubmitDir |
| */ |
| public static Path getJobDistCacheFiles(Path jobSubmitDir) { |
| return new Path(jobSubmitDir, "files"); |
| } |
| /** |
| * Get the job distributed cache archives path. |
| * @param jobSubmitDir |
| */ |
| public static Path getJobDistCacheArchives(Path jobSubmitDir) { |
| return new Path(jobSubmitDir, "archives"); |
| } |
| /** |
| * Get the job distributed cache libjars path. |
| * @param jobSubmitDir |
| */ |
| public static Path getJobDistCacheLibjars(Path jobSubmitDir) { |
| return new Path(jobSubmitDir, "libjars"); |
| } |
| |
| /** |
| * Initializes the staging directory and returns the path. It also |
| * keeps track of all necessary ownership & permissions |
| * @param cluster |
| * @param conf |
| */ |
| public static Path getStagingDir(Cluster cluster, Configuration conf) |
| throws IOException,InterruptedException { |
| Path stagingArea = cluster.getStagingAreaDir(); |
| FileSystem fs = stagingArea.getFileSystem(conf); |
| String realUser; |
| String currentUser; |
| UserGroupInformation ugi = UserGroupInformation.getLoginUser(); |
| realUser = ugi.getShortUserName(); |
| currentUser = UserGroupInformation.getCurrentUser().getShortUserName(); |
| if (fs.exists(stagingArea)) { |
| FileStatus fsStatus = fs.getFileStatus(stagingArea); |
| String owner = fsStatus.getOwner(); |
| if (!(owner.equals(currentUser) || owner.equals(realUser)) || |
| !fsStatus.getPermission().equals(JOB_DIR_PERMISSION)) { |
| throw new IOException("The ownership/permissions on the staging " + |
| "directory " + stagingArea + " is not as expected. " + |
| "It is owned by " + owner + " and permissions are "+ |
| fsStatus.getPermission() + ". The directory must " + |
| "be owned by the submitter " + currentUser + " or " + |
| "by " + realUser + " and permissions must be rwx------"); |
| } |
| } else { |
| fs.mkdirs(stagingArea, |
| new FsPermission(JOB_DIR_PERMISSION)); |
| } |
| return stagingArea; |
| } |
| |
| } |