| /** |
| * 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.nativetask.util; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.LocalDirAllocator; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.TaskID; |
| |
| @InterfaceAudience.Private |
| public class LocalJobOutputFiles implements NativeTaskOutput { |
| |
| static final String TASKTRACKER_OUTPUT = "output"; |
| static final String REDUCE_INPUT_FILE_FORMAT_STRING = "%s/map_%d.out"; |
| static final String SPILL_FILE_FORMAT_STRING = "%s/spill%d.out"; |
| static final String SPILL_INDEX_FILE_FORMAT_STRING = "%s/spill%d.out.index"; |
| static final String OUTPUT_FILE_FORMAT_STRING = "%s/file.out"; |
| static final String OUTPUT_FILE_INDEX_FORMAT_STRING = "%s/file.out.index"; |
| |
| private JobConf conf; |
| private LocalDirAllocator lDirAlloc = new LocalDirAllocator("mapred.local.dir"); |
| |
| public LocalJobOutputFiles(Configuration conf, String id) { |
| this.conf = new JobConf(conf); |
| } |
| |
| /** |
| * Return the path to local map output file created earlier |
| */ |
| public Path getOutputFile() throws IOException { |
| String path = String.format(OUTPUT_FILE_FORMAT_STRING, TASKTRACKER_OUTPUT); |
| return lDirAlloc.getLocalPathToRead(path, conf); |
| } |
| |
| /** |
| * Create a local map output file name. |
| * |
| * @param size the size of the file |
| */ |
| public Path getOutputFileForWrite(long size) throws IOException { |
| String path = String.format(OUTPUT_FILE_FORMAT_STRING, TASKTRACKER_OUTPUT); |
| return lDirAlloc.getLocalPathForWrite(path, size, conf); |
| } |
| |
| /** |
| * Return the path to a local map output index file created earlier |
| */ |
| public Path getOutputIndexFile() throws IOException { |
| String path = String.format(OUTPUT_FILE_INDEX_FORMAT_STRING, TASKTRACKER_OUTPUT); |
| return lDirAlloc.getLocalPathToRead(path, conf); |
| } |
| |
| /** |
| * Create a local map output index file name. |
| * |
| * @param size the size of the file |
| */ |
| public Path getOutputIndexFileForWrite(long size) throws IOException { |
| String path = String.format(OUTPUT_FILE_INDEX_FORMAT_STRING, TASKTRACKER_OUTPUT); |
| return lDirAlloc.getLocalPathForWrite(path, size, conf); |
| } |
| |
| /** |
| * Return a local map spill file created earlier. |
| * |
| * @param spillNumber the number |
| */ |
| public Path getSpillFile(int spillNumber) throws IOException { |
| String path = String.format(SPILL_FILE_FORMAT_STRING, TASKTRACKER_OUTPUT, spillNumber); |
| return lDirAlloc.getLocalPathToRead(path, conf); |
| } |
| |
| /** |
| * Create a local map spill file name. |
| * |
| * @param spillNumber the number |
| * @param size the size of the file |
| */ |
| public Path getSpillFileForWrite(int spillNumber, long size) throws IOException { |
| String path = String.format(SPILL_FILE_FORMAT_STRING, TASKTRACKER_OUTPUT, spillNumber); |
| return lDirAlloc.getLocalPathForWrite(path, size, conf); |
| } |
| |
| /** |
| * Return a local map spill index file created earlier |
| * |
| * @param spillNumber the number |
| */ |
| public Path getSpillIndexFile(int spillNumber) throws IOException { |
| String path = String |
| .format(SPILL_INDEX_FILE_FORMAT_STRING, TASKTRACKER_OUTPUT, spillNumber); |
| return lDirAlloc.getLocalPathToRead(path, conf); |
| } |
| |
| /** |
| * Create a local map spill index file name. |
| * |
| * @param spillNumber the number |
| * @param size the size of the file |
| */ |
| public Path getSpillIndexFileForWrite(int spillNumber, long size) throws IOException { |
| String path = String |
| .format(SPILL_INDEX_FILE_FORMAT_STRING, TASKTRACKER_OUTPUT, spillNumber); |
| return lDirAlloc.getLocalPathForWrite(path, size, conf); |
| } |
| |
| /** |
| * Return a local reduce input file created earlier |
| * |
| * @param mapId a map task id |
| */ |
| public Path getInputFile(int mapId) throws IOException { |
| return lDirAlloc.getLocalPathToRead( |
| String.format(REDUCE_INPUT_FILE_FORMAT_STRING, TASKTRACKER_OUTPUT, Integer.valueOf(mapId)), |
| conf); |
| } |
| |
| /** |
| * Create a local reduce input file name. |
| * |
| * @param mapId a map task id |
| * @param size the size of the file |
| */ |
| public Path getInputFileForWrite(TaskID mapId, long size, Configuration conf) |
| throws IOException { |
| return lDirAlloc.getLocalPathForWrite( |
| String.format(REDUCE_INPUT_FILE_FORMAT_STRING, TASKTRACKER_OUTPUT, mapId.getId()), size, |
| conf); |
| } |
| |
| /** Removes all of the files related to a task. */ |
| public void removeAll() throws IOException { |
| conf.deleteLocalFiles(TASKTRACKER_OUTPUT); |
| } |
| |
| public String getOutputName(int partition) { |
| return String.format("part-%05d", partition); |
| } |
| |
| } |