/**
* 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.lib.input;
import java.io.*;
import java.util.*;
import junit.framework.TestCase;
import org.apache.commons.logging.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.MapContext;
import org.apache.hadoop.mapreduce.MapReduceTestUtil;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.conf.*;
public class TestMRSequenceFileInputFilter extends TestCase {
private static final Log LOG =
LogFactory.getLog(TestMRSequenceFileInputFilter.class.getName());
private static final int MAX_LENGTH = 15000;
private static final Configuration conf = new Configuration();
private static final Job job;
private static final FileSystem fs;
private static final Path inDir =
new Path(System.getProperty("test.build.data",".") + "/mapred");
private static final Path inFile = new Path(inDir, "test.seq");
private static final Random random = new Random(1);
static {
try {
job = new Job(conf);
FileInputFormat.setInputPaths(job, inDir);
fs = FileSystem.getLocal(conf);
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
private static void createSequenceFile(int numRecords) throws Exception {
// create a file with length entries
SequenceFile.Writer writer =
SequenceFile.createWriter(fs, conf, inFile,
Text.class, BytesWritable.class);
try {
for (int i = 1; i <= numRecords; i++) {
Text key = new Text(Integer.toString(i));
byte[] data = new byte[random.nextInt(10)];
random.nextBytes(data);
BytesWritable value = new BytesWritable(data);
writer.append(key, value);
}
} finally {
writer.close();
}
}
private int countRecords(int numSplits)
throws IOException, InterruptedException {
InputFormat<Text, BytesWritable> format =
new SequenceFileInputFilter<Text, BytesWritable>();
if (numSplits == 0) {
numSplits =
random.nextInt(MAX_LENGTH / (SequenceFile.SYNC_INTERVAL / 20)) + 1;
}
FileInputFormat.setMaxInputSplitSize(job,
fs.getFileStatus(inFile).getLen() / numSplits);
TaskAttemptContext context = MapReduceTestUtil.
createDummyMapTaskAttemptContext(job.getConfiguration());
// check each split
int count = 0;
for (InputSplit split : format.getSplits(job)) {
RecordReader<Text, BytesWritable> reader =
format.createRecordReader(split, context);
MapContext<Text, BytesWritable, Text, BytesWritable> mcontext =
new MapContext<Text, BytesWritable, Text, BytesWritable>(
job.getConfiguration(),
context.getTaskAttemptID(), reader, null, null,
MapReduceTestUtil.createDummyReporter(), split);
reader.initialize(split, mcontext);
try {
while (reader.nextKeyValue()) {
LOG.info("Accept record " + reader.getCurrentKey().toString());
count++;
}
} finally {
reader.close();
}
}
return count;
}
public void testRegexFilter() throws Exception {
// set the filter class
LOG.info("Testing Regex Filter with patter: \\A10*");
SequenceFileInputFilter.setFilterClass(job,
SequenceFileInputFilter.RegexFilter.class);
SequenceFileInputFilter.RegexFilter.setPattern(
job.getConfiguration(), "\\A10*");
// clean input dir
fs.delete(inDir, true);
// for a variety of lengths
for (int length = 1; length < MAX_LENGTH;
length += random.nextInt(MAX_LENGTH / 10) + 1) {
LOG.info("******Number of records: " + length);
createSequenceFile(length);
int count = countRecords(0);
assertEquals(count, length==0 ? 0 : (int)Math.log10(length) + 1);
}
// clean up
fs.delete(inDir, true);
}
public void testPercentFilter() throws Exception {
LOG.info("Testing Percent Filter with frequency: 1000");
// set the filter class
SequenceFileInputFilter.setFilterClass(job,
SequenceFileInputFilter.PercentFilter.class);
SequenceFileInputFilter.PercentFilter.setFrequency(
job.getConfiguration(), 1000);
// clean input dir
fs.delete(inDir, true);
// for a variety of lengths
for (int length = 0; length < MAX_LENGTH;
length += random.nextInt(MAX_LENGTH / 10) + 1) {
LOG.info("******Number of records: "+length);
createSequenceFile(length);
int count = countRecords(1);
LOG.info("Accepted " + count + " records");
int expectedCount = length / 1000;
if (expectedCount * 1000 != length)
expectedCount++;
assertEquals(count, expectedCount);
}
// clean up
fs.delete(inDir, true);
}
public void testMD5Filter() throws Exception {
// set the filter class
LOG.info("Testing MD5 Filter with frequency: 1000");
SequenceFileInputFilter.setFilterClass(job,
SequenceFileInputFilter.MD5Filter.class);
SequenceFileInputFilter.MD5Filter.setFrequency(
job.getConfiguration(), 1000);
// clean input dir
fs.delete(inDir, true);
// for a variety of lengths
for (int length = 0; length < MAX_LENGTH;
length += random.nextInt(MAX_LENGTH / 10) + 1) {
LOG.info("******Number of records: " + length);
createSequenceFile(length);
LOG.info("Accepted " + countRecords(0) + " records");
}
// clean up
fs.delete(inDir, true);
}
public static void main(String[] args) throws Exception {
TestMRSequenceFileInputFilter filter = new TestMRSequenceFileInputFilter();
filter.testRegexFilter();
}
}