/**
* 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.mrunit.mapreduce;
import static org.apache.hadoop.mrunit.testutil.ExtendedAssert.assertListEquals;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import junit.framework.TestCase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.RawComparator;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.Reducer.Context;
import org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer;
import org.apache.hadoop.mrunit.mapreduce.TestMapDriver.ConfigurationMapper;
import org.apache.hadoop.mrunit.mapreduce.TestReduceDriver.ConfigurationReducer;
import org.apache.hadoop.mrunit.types.Pair;
import org.junit.Before;
import org.junit.Test;
public class TestMapReduceDriver extends TestCase {
private static final int FOO_IN_A = 42;
private static final int FOO_IN_B = 10;
private static final int BAR_IN = 12;
private static final int FOO_OUT = 52;
private Mapper<Text, LongWritable, Text, LongWritable> mapper;
private Reducer<Text, LongWritable, Text, LongWritable> reducer;
private MapReduceDriver<Text, LongWritable,
Text, LongWritable,
Text, LongWritable> driver;
private MapReduceDriver<Text, Text, Text, Text, Text, Text> driver2;
@Before
public void setUp() throws Exception {
mapper = new Mapper<Text, LongWritable, Text, LongWritable>(); // This is the IdentityMapper
reducer = new LongSumReducer<Text>();
driver = new MapReduceDriver<Text, LongWritable,
Text, LongWritable,
Text, LongWritable>(
mapper, reducer);
// for shuffle tests
driver2 = new MapReduceDriver<Text, Text, Text, Text, Text, Text>();
}
@Test
public void testRun() {
List<Pair<Text, LongWritable>> out = null;
try {
out = driver
.withInput(new Text("foo"), new LongWritable(FOO_IN_A))
.withInput(new Text("foo"), new LongWritable(FOO_IN_B))
.withInput(new Text("bar"), new LongWritable(BAR_IN))
.run();
} catch (IOException ioe) {
fail();
}
List<Pair<Text, LongWritable>> expected =
new ArrayList<Pair<Text, LongWritable>>();
expected.add(new Pair<Text, LongWritable>(new Text("bar"),
new LongWritable(BAR_IN)));
expected.add(new Pair<Text, LongWritable>(new Text("foo"),
new LongWritable(FOO_OUT)));
assertListEquals(out, expected);
}
@Test
public void testTestRun1() {
driver
.withInput(new Text("foo"), new LongWritable(FOO_IN_A))
.withInput(new Text("foo"), new LongWritable(FOO_IN_B))
.withInput(new Text("bar"), new LongWritable(BAR_IN))
.withOutput(new Text("bar"), new LongWritable(BAR_IN))
.withOutput(new Text("foo"), new LongWritable(FOO_OUT))
.runTest();
}
@Test
public void testTestRun2() {
driver
.withInput(new Text("foo"), new LongWritable(FOO_IN_A))
.withInput(new Text("bar"), new LongWritable(BAR_IN))
.withInput(new Text("foo"), new LongWritable(FOO_IN_B))
.withOutput(new Text("bar"), new LongWritable(BAR_IN))
.withOutput(new Text("foo"), new LongWritable(FOO_OUT))
.runTest();
}
@Test
public void testTestRun3() {
try {
driver
.withInput(new Text("foo"), new LongWritable(FOO_IN_A))
.withInput(new Text("bar"), new LongWritable(BAR_IN))
.withInput(new Text("foo"), new LongWritable(FOO_IN_B))
.withOutput(new Text("foo"), new LongWritable(FOO_OUT))
.withOutput(new Text("bar"), new LongWritable(BAR_IN))
.runTest();
fail();
} catch (RuntimeException re) {
// expected
}
}
@Test
public void testEmptyInput() {
driver.runTest();
}
@Test
public void testEmptyInputWithOutputFails() {
try {
driver
.withOutput(new Text("foo"), new LongWritable(FOO_OUT))
.runTest();
fail();
} catch (RuntimeException re) {
// expected.
}
}
@Test
public void testEmptyShuffle() {
List<Pair<Text, Text>> inputs = new ArrayList<Pair<Text, Text>>();
List<Pair<Text, List<Text>>> outputs = driver2.shuffle(inputs);
assertEquals(0, outputs.size());
}
// just shuffle a single (k, v) pair
@Test
public void testSingleShuffle() {
List<Pair<Text, Text>> inputs = new ArrayList<Pair<Text, Text>>();
inputs.add(new Pair<Text, Text>(new Text("a"), new Text("b")));
List<Pair<Text, List<Text>>> outputs = driver2.shuffle(inputs);
List<Pair<Text, List<Text>>> expected = new ArrayList<Pair<Text, List<Text>>>();
List<Text> sublist = new ArrayList<Text>();
sublist.add(new Text("b"));
expected.add(new Pair<Text, List<Text>>(new Text("a"), sublist));
assertListEquals(expected, outputs);
}
// shuffle multiple values from the same key.
@Test
public void testShuffleOneKey() {
List<Pair<Text, Text>> inputs = new ArrayList<Pair<Text, Text>>();
inputs.add(new Pair<Text, Text>(new Text("a"), new Text("b")));
inputs.add(new Pair<Text, Text>(new Text("a"), new Text("c")));
List<Pair<Text, List<Text>>> outputs = driver2.shuffle(inputs);
List<Pair<Text, List<Text>>> expected = new ArrayList<Pair<Text, List<Text>>>();
List<Text> sublist = new ArrayList<Text>();
sublist.add(new Text("b"));
sublist.add(new Text("c"));
expected.add(new Pair<Text, List<Text>>(new Text("a"), sublist));
assertListEquals(expected, outputs);
}
// shuffle multiple keys
@Test
public void testMultiShuffle1() {
List<Pair<Text, Text>> inputs = new ArrayList<Pair<Text, Text>>();
inputs.add(new Pair<Text, Text>(new Text("a"), new Text("x")));
inputs.add(new Pair<Text, Text>(new Text("b"), new Text("z")));
inputs.add(new Pair<Text, Text>(new Text("b"), new Text("w")));
inputs.add(new Pair<Text, Text>(new Text("a"), new Text("y")));
List<Pair<Text, List<Text>>> outputs = driver2.shuffle(inputs);
List<Pair<Text, List<Text>>> expected = new ArrayList<Pair<Text, List<Text>>>();
List<Text> sublist1 = new ArrayList<Text>();
sublist1.add(new Text("x"));
sublist1.add(new Text("y"));
expected.add(new Pair<Text, List<Text>>(new Text("a"), sublist1));
List<Text> sublist2 = new ArrayList<Text>();
sublist2.add(new Text("z"));
sublist2.add(new Text("w"));
expected.add(new Pair<Text, List<Text>>(new Text("b"), sublist2));
assertListEquals(expected, outputs);
}
// shuffle multiple keys that are out-of-order to start.
@Test
public void testMultiShuffle2() {
List<Pair<Text, Text>> inputs = new ArrayList<Pair<Text, Text>>();
inputs.add(new Pair<Text, Text>(new Text("b"), new Text("z")));
inputs.add(new Pair<Text, Text>(new Text("a"), new Text("x")));
inputs.add(new Pair<Text, Text>(new Text("b"), new Text("w")));
inputs.add(new Pair<Text, Text>(new Text("a"), new Text("y")));
List<Pair<Text, List<Text>>> outputs = driver2.shuffle(inputs);
List<Pair<Text, List<Text>>> expected = new ArrayList<Pair<Text, List<Text>>>();
List<Text> sublist1 = new ArrayList<Text>();
sublist1.add(new Text("x"));
sublist1.add(new Text("y"));
expected.add(new Pair<Text, List<Text>>(new Text("a"), sublist1));
List<Text> sublist2 = new ArrayList<Text>();
sublist2.add(new Text("z"));
sublist2.add(new Text("w"));
expected.add(new Pair<Text, List<Text>>(new Text("b"), sublist2));
assertListEquals(expected, outputs);
}
@Test
public void testConfiguration() {
Configuration conf = new Configuration();
conf.set("TestKey", "TestValue");
MapReduceDriver<NullWritable, NullWritable, NullWritable, NullWritable, NullWritable, NullWritable> confDriver
= new MapReduceDriver<NullWritable, NullWritable, NullWritable, NullWritable, NullWritable, NullWritable>();
ConfigurationMapper<NullWritable, NullWritable, NullWritable, NullWritable> mapper
= new ConfigurationMapper<NullWritable, NullWritable, NullWritable, NullWritable>();
ConfigurationReducer<NullWritable, NullWritable, NullWritable, NullWritable> reducer
= new ConfigurationReducer<NullWritable, NullWritable, NullWritable, NullWritable>();
confDriver.withMapper(mapper).withReducer(reducer).withConfiguration(conf).
withInput(NullWritable.get(),NullWritable.get()).
withOutput(NullWritable.get(),NullWritable.get()).runTest();
assertEquals(mapper.setupConfiguration.get("TestKey"), "TestValue");
assertEquals(reducer.setupConfiguration.get("TestKey"), "TestValue");
}
// Test the key grouping and value ordering comparators
@Test
public void testComparators() {
// group comparator - group by first character
RawComparator groupComparator = new RawComparator() {
@Override
public int compare(Object o1, Object o2) {
return o1.toString().substring(0, 1).compareTo(
o2.toString().substring(0, 1));
}
@Override
public int compare(byte[] arg0, int arg1, int arg2, byte[] arg3,
int arg4, int arg5) {
throw new RuntimeException("Not implemented");
}
};
// value order comparator - order by second character
RawComparator orderComparator = new RawComparator() {
@Override
public int compare(Object o1, Object o2) {
return o1.toString().substring(1, 2).compareTo(
o2.toString().substring(1, 2));
}
@Override
public int compare(byte[] arg0, int arg1, int arg2, byte[] arg3,
int arg4, int arg5) {
throw new RuntimeException("Not implemented");
}
};
// reducer to track the order of the input values using bit shifting
driver.withReducer(new Reducer<Text, LongWritable, Text, LongWritable>() {
protected void reduce(Text key, Iterable<LongWritable> values, Context context)
throws IOException, InterruptedException {
long outputValue = 0;
int count = 0;
for (LongWritable value : values) {
outputValue |= (value.get() << (count++*8));
}
context.write(key, new LongWritable(outputValue));
}
});
driver.withKeyGroupingComparator(groupComparator);
driver.withKeyOrderComparator(orderComparator);
driver.addInput(new Text("a1"), new LongWritable(1));
driver.addInput(new Text("b1"), new LongWritable(1));
driver.addInput(new Text("a3"), new LongWritable(3));
driver.addInput(new Text("a2"), new LongWritable(2));
driver.addOutput(new Text("a1"), new LongWritable(0x1 | (0x2 << 8) | (0x3 << 16)));
driver.addOutput(new Text("b1"), new LongWritable(0x1));
driver.runTest();
}
}