| /** |
| * 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.mapred; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.LocalDirAllocator; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.MRConfig; |
| |
| /** |
| * Manipulate the working area for the transient store for maps and reduces. |
| * |
| * This class is used by map and reduce tasks to identify the directories that |
| * they need to write to/read from for intermediate files. The callers of |
| * these methods are from child space. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class YarnOutputFiles extends MapOutputFile { |
| |
| private JobConf conf; |
| |
| private static final String JOB_OUTPUT_DIR = "output"; |
| private static final String SPILL_FILE_PATTERN = "%s_spill_%d.out"; |
| private static final String SPILL_INDEX_FILE_PATTERN = SPILL_FILE_PATTERN |
| + ".index"; |
| |
| public YarnOutputFiles() { |
| } |
| |
| // assume configured to $localdir/usercache/$user/appcache/$appId |
| private LocalDirAllocator lDirAlloc = |
| new LocalDirAllocator(MRConfig.LOCAL_DIR); |
| |
| private Path getAttemptOutputDir() { |
| return new Path(JOB_OUTPUT_DIR, conf.get(JobContext.TASK_ATTEMPT_ID)); |
| } |
| |
| /** |
| * Return the path to local map output file created earlier |
| * |
| * @return path |
| * @throws IOException |
| */ |
| public Path getOutputFile() throws IOException { |
| Path attemptOutput = |
| new Path(getAttemptOutputDir(), MAP_OUTPUT_FILENAME_STRING); |
| return lDirAlloc.getLocalPathToRead(attemptOutput.toString(), conf); |
| } |
| |
| /** |
| * Create a local map output file name. |
| * |
| * @param size the size of the file |
| * @return path |
| * @throws IOException |
| */ |
| public Path getOutputFileForWrite(long size) throws IOException { |
| Path attemptOutput = |
| new Path(getAttemptOutputDir(), MAP_OUTPUT_FILENAME_STRING); |
| return lDirAlloc.getLocalPathForWrite(attemptOutput.toString(), size, conf); |
| } |
| |
| /** |
| * Create a local map output file name on the same volume. |
| */ |
| public Path getOutputFileForWriteInVolume(Path existing) { |
| Path outputDir = new Path(existing.getParent(), JOB_OUTPUT_DIR); |
| Path attemptOutputDir = new Path(outputDir, |
| conf.get(JobContext.TASK_ATTEMPT_ID)); |
| return new Path(attemptOutputDir, MAP_OUTPUT_FILENAME_STRING); |
| } |
| |
| /** |
| * Return the path to a local map output index file created earlier |
| * |
| * @return path |
| * @throws IOException |
| */ |
| public Path getOutputIndexFile() throws IOException { |
| Path attemptIndexOutput = |
| new Path(getAttemptOutputDir(), MAP_OUTPUT_FILENAME_STRING + |
| MAP_OUTPUT_INDEX_SUFFIX_STRING); |
| return lDirAlloc.getLocalPathToRead(attemptIndexOutput.toString(), conf); |
| } |
| |
| /** |
| * Create a local map output index file name. |
| * |
| * @param size the size of the file |
| * @return path |
| * @throws IOException |
| */ |
| public Path getOutputIndexFileForWrite(long size) throws IOException { |
| Path attemptIndexOutput = |
| new Path(getAttemptOutputDir(), MAP_OUTPUT_FILENAME_STRING + |
| MAP_OUTPUT_INDEX_SUFFIX_STRING); |
| return lDirAlloc.getLocalPathForWrite(attemptIndexOutput.toString(), |
| size, conf); |
| } |
| |
| /** |
| * Create a local map output index file name on the same volume. |
| */ |
| public Path getOutputIndexFileForWriteInVolume(Path existing) { |
| Path outputDir = new Path(existing.getParent(), JOB_OUTPUT_DIR); |
| Path attemptOutputDir = new Path(outputDir, |
| conf.get(JobContext.TASK_ATTEMPT_ID)); |
| return new Path(attemptOutputDir, MAP_OUTPUT_FILENAME_STRING + |
| MAP_OUTPUT_INDEX_SUFFIX_STRING); |
| } |
| |
| /** |
| * Return a local map spill file created earlier. |
| * |
| * @param spillNumber the number |
| * @return path |
| * @throws IOException |
| */ |
| public Path getSpillFile(int spillNumber) throws IOException { |
| return lDirAlloc.getLocalPathToRead( |
| String.format(SPILL_FILE_PATTERN, |
| conf.get(JobContext.TASK_ATTEMPT_ID), spillNumber), conf); |
| } |
| |
| /** |
| * Create a local map spill file name. |
| * |
| * @param spillNumber the number |
| * @param size the size of the file |
| * @return path |
| * @throws IOException |
| */ |
| public Path getSpillFileForWrite(int spillNumber, long size) |
| throws IOException { |
| return lDirAlloc.getLocalPathForWrite( |
| String.format(String.format(SPILL_FILE_PATTERN, |
| conf.get(JobContext.TASK_ATTEMPT_ID), spillNumber)), size, conf); |
| } |
| |
| /** |
| * Return a local map spill index file created earlier |
| * |
| * @param spillNumber the number |
| * @return path |
| * @throws IOException |
| */ |
| public Path getSpillIndexFile(int spillNumber) throws IOException { |
| return lDirAlloc.getLocalPathToRead( |
| String.format(SPILL_INDEX_FILE_PATTERN, |
| conf.get(JobContext.TASK_ATTEMPT_ID), spillNumber), conf); |
| } |
| |
| /** |
| * Create a local map spill index file name. |
| * |
| * @param spillNumber the number |
| * @param size the size of the file |
| * @return path |
| * @throws IOException |
| */ |
| public Path getSpillIndexFileForWrite(int spillNumber, long size) |
| throws IOException { |
| return lDirAlloc.getLocalPathForWrite( |
| String.format(SPILL_INDEX_FILE_PATTERN, |
| conf.get(JobContext.TASK_ATTEMPT_ID), spillNumber), size, conf); |
| } |
| |
| /** |
| * Return a local reduce input file created earlier |
| * |
| * @param mapId a map task id |
| * @return path |
| * @throws IOException |
| */ |
| public Path getInputFile(int mapId) throws IOException { |
| throw new UnsupportedOperationException("Incompatible with LocalRunner"); |
| } |
| |
| /** |
| * Create a local reduce input file name. |
| * |
| * @param mapId a map task id |
| * @param size the size of the file |
| * @return path |
| * @throws IOException |
| */ |
| public Path getInputFileForWrite(org.apache.hadoop.mapreduce.TaskID mapId, |
| long size) throws IOException { |
| return lDirAlloc.getLocalPathForWrite(String.format( |
| REDUCE_INPUT_FILE_FORMAT_STRING, |
| getAttemptOutputDir().toString(), mapId.getId()), |
| size, conf); |
| } |
| |
| /** Removes all of the files related to a task. */ |
| public void removeAll() throws IOException { |
| throw new UnsupportedOperationException("Incompatible with LocalRunner"); |
| } |
| |
| @Override |
| public void setConf(Configuration conf) { |
| if (conf instanceof JobConf) { |
| this.conf = (JobConf) conf; |
| } else { |
| this.conf = new JobConf(conf); |
| } |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return conf; |
| } |
| |
| } |