/**
* 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;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import junit.framework.TestCase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.examples.MultiFileWordCount;
import org.apache.hadoop.examples.WordCount;
import org.apache.hadoop.examples.WordCount.IntSumReducer;
import org.apache.hadoop.examples.WordCount.TokenizerMapper;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.MiniMRCluster;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormatCounter;
import org.apache.hadoop.mapreduce.lib.input.LineRecordReader;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.ToolRunner;
/**
* A JUnit test to test min map-reduce cluster with local file system.
*/
public class TestMapReduceLocal extends TestCase {
private static Path TEST_ROOT_DIR =
new Path(System.getProperty("test.build.data","/tmp"));
private static Configuration conf = new Configuration();
private static FileSystem localFs;
static {
try {
localFs = FileSystem.getLocal(conf);
} catch (IOException io) {
throw new RuntimeException("problem getting local fs", io);
}
}
public static Path writeFile(String name, String data) throws IOException {
Path file = new Path(TEST_ROOT_DIR + "/" + name);
localFs.delete(file, false);
DataOutputStream f = localFs.create(file);
f.write(data.getBytes());
f.close();
return file;
}
public static String readFile(String name) throws IOException {
DataInputStream f = localFs.open(new Path(TEST_ROOT_DIR + "/" + name));
BufferedReader b = new BufferedReader(new InputStreamReader(f));
StringBuilder result = new StringBuilder();
String line = b.readLine();
while (line != null) {
result.append(line);
result.append('\n');
line = b.readLine();
}
b.close();
return result.toString();
}
public void testWithLocal() throws Exception {
MiniMRCluster mr = null;
try {
mr = new MiniMRCluster(2, "file:///", 3);
Configuration conf = mr.createJobConf();
runWordCount(conf);
runMultiFileWordCount(conf);
} finally {
if (mr != null) { mr.shutdown(); }
}
}
public static class TrackingTextInputFormat extends TextInputFormat {
public static class MonoProgressRecordReader extends LineRecordReader {
private float last = 0.0f;
private boolean progressCalled = false;
@Override
public float getProgress() throws IOException {
progressCalled = true;
final float ret = super.getProgress();
assertTrue("getProgress decreased", ret >= last);
last = ret;
return ret;
}
@Override
public synchronized void close() throws IOException {
assertTrue("getProgress never called", progressCalled);
super.close();
}
}
@Override
public RecordReader<LongWritable, Text> createRecordReader(
InputSplit split, TaskAttemptContext context) {
return new MonoProgressRecordReader();
}
}
private void runWordCount(Configuration conf
) throws IOException,
InterruptedException,
ClassNotFoundException {
final String COUNTER_GROUP = "org.apache.hadoop.mapreduce.TaskCounter";
localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);
writeFile("in/part1", "this is a test\nof word count test\ntest\n");
writeFile("in/part2", "more test");
Job job = Job.getInstance(conf, "word count");
job.setJarByClass(WordCount.class);
job.setMapperClass(TokenizerMapper.class);
job.setCombinerClass(IntSumReducer.class);
job.setReducerClass(IntSumReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
job.setInputFormatClass(TrackingTextInputFormat.class);
FileInputFormat.addInputPath(job, new Path(TEST_ROOT_DIR + "/in"));
FileOutputFormat.setOutputPath(job, new Path(TEST_ROOT_DIR + "/out"));
assertTrue(job.waitForCompletion(false));
String out = readFile("out/part-r-00000");
System.out.println(out);
assertEquals("a\t1\ncount\t1\nis\t1\nmore\t1\nof\t1\ntest\t4\nthis\t1\nword\t1\n",
out);
Counters ctrs = job.getCounters();
System.out.println("Counters: " + ctrs);
long mapIn = ctrs.findCounter(FileInputFormatCounter.BYTES_READ).getValue();
assertTrue(mapIn != 0);
long combineIn = ctrs.findCounter(COUNTER_GROUP,
"COMBINE_INPUT_RECORDS").getValue();
long combineOut = ctrs.findCounter(COUNTER_GROUP,
"COMBINE_OUTPUT_RECORDS").getValue();
long reduceIn = ctrs.findCounter(COUNTER_GROUP,
"REDUCE_INPUT_RECORDS").getValue();
long mapOut = ctrs.findCounter(COUNTER_GROUP,
"MAP_OUTPUT_RECORDS").getValue();
long reduceOut = ctrs.findCounter(COUNTER_GROUP,
"REDUCE_OUTPUT_RECORDS").getValue();
long reduceGrps = ctrs.findCounter(COUNTER_GROUP,
"REDUCE_INPUT_GROUPS").getValue();
long mergedMapOutputs = ctrs.findCounter(COUNTER_GROUP,
"MERGED_MAP_OUTPUTS").getValue();
long shuffledMaps = ctrs.findCounter(COUNTER_GROUP,
"SHUFFLED_MAPS").getValue();
assertEquals("map out = combine in", mapOut, combineIn);
assertEquals("combine out = reduce in", combineOut, reduceIn);
assertTrue("combine in > combine out", combineIn > combineOut);
assertEquals("reduce groups = reduce out", reduceGrps, reduceOut);
assertEquals("Mismatch in mergedMapOutputs", mergedMapOutputs, 2);
assertEquals("Mismatch in shuffledMaps", shuffledMaps, 2);
String group = "Random Group";
CounterGroup ctrGrp = ctrs.getGroup(group);
assertEquals(0, ctrGrp.size());
}
public void runMultiFileWordCount(Configuration conf) throws Exception {
localFs.delete(new Path(TEST_ROOT_DIR + "/in"), true);
localFs.delete(new Path(TEST_ROOT_DIR + "/out"), true);
writeFile("in/part1", "this is a test\nof " +
"multi file word count test\ntest\n");
writeFile("in/part2", "more test");
int ret = ToolRunner.run(conf, new MultiFileWordCount(),
new String[] {TEST_ROOT_DIR + "/in", TEST_ROOT_DIR + "/out"});
assertTrue("MultiFileWordCount failed", ret == 0);
String out = readFile("out/part-r-00000");
System.out.println(out);
assertEquals("a\t1\ncount\t1\nfile\t1\nis\t1\n" +
"more\t1\nmulti\t1\nof\t1\ntest\t4\nthis\t1\nword\t1\n", out);
}
}