/**
* 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 java.util.Date;
import java.util.Random;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.SequenceFile.CompressionType;
import org.apache.hadoop.mapred.SortValidator.RecordStatsChecker.NonSplitableSequenceFileInputFormat;
import org.apache.hadoop.mapred.lib.IdentityMapper;
import org.apache.hadoop.mapred.lib.IdentityReducer;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
public class BigMapOutput extends Configured implements Tool {
public static final Log LOG =
LogFactory.getLog(BigMapOutput.class.getName());
private static Random random = new Random();
private static void randomizeBytes(byte[] data, int offset, int length) {
for(int i=offset + length - 1; i >= offset; --i) {
data[i] = (byte) random.nextInt(256);
}
}
private static void createBigMapInputFile(Configuration conf, FileSystem fs,
Path dir, long fileSizeInMB)
throws IOException {
// Check if the input path exists and is non-empty
if (fs.exists(dir)) {
FileStatus[] list = fs.listStatus(dir);
if (list != null && list.length > 0) {
throw new IOException("Input path: " + dir + " already exists... ");
}
}
Path file = new Path(dir, "part-0");
SequenceFile.Writer writer =
SequenceFile.createWriter(fs, conf, file,
BytesWritable.class, BytesWritable.class,
CompressionType.NONE);
long numBytesToWrite = fileSizeInMB * 1024 * 1024;
int minKeySize = conf.getInt("test.bmo.min_key", 10);;
int keySizeRange =
conf.getInt("test.bmo.max_key", 1000) - minKeySize;
int minValueSize = conf.getInt("test.bmo.min_value", 0);
int valueSizeRange =
conf.getInt("test.bmo.max_value", 20000) - minValueSize;
BytesWritable randomKey = new BytesWritable();
BytesWritable randomValue = new BytesWritable();
LOG.info("Writing " + numBytesToWrite + " bytes to " + file + " with " +
"minKeySize: " + minKeySize + " keySizeRange: " + keySizeRange +
" minValueSize: " + minValueSize + " valueSizeRange: " + valueSizeRange);
long start = System.currentTimeMillis();
while (numBytesToWrite > 0) {
int keyLength = minKeySize +
(keySizeRange != 0 ? random.nextInt(keySizeRange) : 0);
randomKey.setSize(keyLength);
randomizeBytes(randomKey.getBytes(), 0, randomKey.getLength());
int valueLength = minValueSize +
(valueSizeRange != 0 ? random.nextInt(valueSizeRange) : 0);
randomValue.setSize(valueLength);
randomizeBytes(randomValue.getBytes(), 0, randomValue.getLength());
writer.append(randomKey, randomValue);
numBytesToWrite -= keyLength + valueLength;
}
writer.close();
long end = System.currentTimeMillis();
LOG.info("Created " + file + " of size: " + fileSizeInMB + "MB in " +
(end-start)/1000 + "secs");
}
private static void usage() {
System.err.println("BigMapOutput -input <input-dir> -output <output-dir> " +
"[-create <filesize in MB>]");
ToolRunner.printGenericCommandUsage(System.err);
System.exit(1);
}
public int run(String[] args) throws Exception {
if (args.length < 4) { //input-dir should contain a huge file ( > 2GB)
usage();
}
Path bigMapInput = null;
Path outputPath = null;
boolean createInput = false;
long fileSizeInMB = 3 * 1024; // default of 3GB (>2GB)
for(int i=0; i < args.length; ++i) {
if ("-input".equals(args[i])){
bigMapInput = new Path(args[++i]);
} else if ("-output".equals(args[i])){
outputPath = new Path(args[++i]);
} else if ("-create".equals(args[i])) {
createInput = true;
fileSizeInMB = Long.parseLong(args[++i]);
} else {
usage();
}
}
FileSystem fs = FileSystem.get(getConf());
JobConf jobConf = new JobConf(getConf(), BigMapOutput.class);
jobConf.setJobName("BigMapOutput");
jobConf.setInputFormat(NonSplitableSequenceFileInputFormat.class);
jobConf.setOutputFormat(SequenceFileOutputFormat.class);
FileInputFormat.setInputPaths(jobConf, bigMapInput);
if (fs.exists(outputPath)) {
fs.delete(outputPath, true);
}
FileOutputFormat.setOutputPath(jobConf, outputPath);
jobConf.setMapperClass(IdentityMapper.class);
jobConf.setReducerClass(IdentityReducer.class);
jobConf.setOutputKeyClass(BytesWritable.class);
jobConf.setOutputValueClass(BytesWritable.class);
if (createInput) {
createBigMapInputFile(jobConf, fs, bigMapInput, fileSizeInMB);
}
Date startTime = new Date();
System.out.println("Job started: " + startTime);
JobClient.runJob(jobConf);
Date end_time = new Date();
System.out.println("Job ended: " + end_time);
return 0;
}
public static void main(String argv[]) throws Exception {
int res = ToolRunner.run(new Configuration(), new BigMapOutput(), argv);
System.exit(res);
}
}