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/**
* 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(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;
}
}
