| /** |
| * 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.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.Text; |
| import org.apache.hadoop.mapreduce.Mapper; |
| import org.apache.hadoop.mapreduce.Reducer; |
| import org.apache.hadoop.mapreduce.Mapper.Context; |
| import org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer; |
| import org.apache.hadoop.mrunit.mapreduce.TestMapDriver.ConfigurationMapper; |
| import org.apache.hadoop.mrunit.types.Pair; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| public class TestReduceDriver extends TestCase { |
| |
| private static final int IN_A = 4; |
| private static final int IN_B = 6; |
| private static final int OUT_VAL = 10; |
| private static final int INCORRECT_OUT = 12; |
| private static final int OUT_EMPTY = 0; |
| |
| private Reducer<Text, LongWritable, Text, LongWritable> reducer; |
| private ReduceDriver<Text, LongWritable, Text, LongWritable> driver; |
| |
| @Before |
| public void setUp() throws Exception { |
| reducer = new LongSumReducer<Text>(); |
| driver = new ReduceDriver<Text, LongWritable, Text, LongWritable>( |
| reducer); |
| } |
| |
| @Test |
| public void testRun() { |
| List<Pair<Text, LongWritable>> out = null; |
| |
| try { |
| out = driver.withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .run(); |
| } catch (IOException ioe) { |
| fail(); |
| } |
| |
| List<Pair<Text, LongWritable>> expected = |
| new ArrayList<Pair<Text, LongWritable>>(); |
| expected.add(new Pair<Text, LongWritable>(new Text("foo"), |
| new LongWritable(OUT_VAL))); |
| |
| assertListEquals(out, expected); |
| |
| } |
| |
| @Test |
| public void testTestRun1() { |
| driver |
| .withInputKey(new Text("foo")) |
| .withOutput(new Text("foo"), new LongWritable(0)) |
| .runTest(); |
| } |
| |
| @Test |
| public void testTestRun2() { |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .withOutput(new Text("foo"), new LongWritable(OUT_VAL)) |
| .runTest(); |
| } |
| |
| @Test |
| public void testTestRun3() { |
| try { |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .withOutput(new Text("bar"), new LongWritable(OUT_VAL)) |
| .runTest(); |
| fail(); |
| } catch (RuntimeException re) { |
| // expected. |
| } |
| |
| } |
| |
| @Test |
| public void testTestRun4() { |
| try { |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .withOutput(new Text("foo"), new LongWritable(INCORRECT_OUT)) |
| .runTest(); |
| fail(); |
| } catch (RuntimeException re) { |
| // expected. |
| } |
| } |
| |
| @Test |
| public void testTestRun5() { |
| try { |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .withOutput(new Text("foo"), new LongWritable(IN_A)) |
| .runTest(); |
| fail(); |
| } catch (RuntimeException re) { |
| // expected. |
| } |
| } |
| |
| @Test |
| public void testTestRun6() { |
| try { |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .withOutput(new Text("foo"), new LongWritable(IN_A)) |
| .withOutput(new Text("foo"), new LongWritable(IN_B)) |
| .runTest(); |
| fail(); |
| } catch (RuntimeException re) { |
| // expected. |
| } |
| } |
| |
| @Test |
| public void testTestRun7() { |
| try { |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .withOutput(new Text("foo"), new LongWritable(OUT_VAL)) |
| .withOutput(new Text("foo"), new LongWritable(OUT_VAL)) |
| .runTest(); |
| fail(); |
| } catch (RuntimeException re) { |
| // expected. |
| } |
| } |
| |
| @Test |
| public void testTestRun8() { |
| try { |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .withOutput(new Text("bar"), new LongWritable(OUT_VAL)) |
| .withOutput(new Text("foo"), new LongWritable(OUT_VAL)) |
| .runTest(); |
| fail(); |
| } catch (RuntimeException re) { |
| // expected. |
| } |
| } |
| |
| @Test |
| public void testTestRun9() { |
| try { |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(IN_A)) |
| .withInputValue(new LongWritable(IN_B)) |
| .withOutput(new Text("foo"), new LongWritable(OUT_VAL)) |
| .withOutput(new Text("bar"), new LongWritable(OUT_VAL)) |
| .runTest(); |
| fail(); |
| } catch (RuntimeException re) { |
| // expected. |
| } |
| } |
| |
| @Test |
| public void testEmptyInput() { |
| // (null, <empty>) will be forcibly fed as input |
| // since we use LongSumReducer, expect (null, 0) out. |
| driver |
| .withOutput(null, new LongWritable(OUT_EMPTY)) |
| .runTest(); |
| } |
| |
| @Test |
| public void testEmptyInput2() { |
| // because a null key with zero inputs will be fed as input |
| // to this reducer, do not accept no outputs. |
| try { |
| driver.runTest(); |
| fail(); |
| } catch (RuntimeException re) { |
| // expected. |
| } |
| } |
| |
| /** |
| * Reducer that counts its values twice; the second iteration |
| * according to mapreduce semantics should be empty. |
| */ |
| private static class DoubleIterReducer<K, V> |
| extends Reducer<K, V, K, LongWritable> { |
| public void reduce(K key, Iterable<V> values, Context c) |
| throws IOException, InterruptedException { |
| long count = 0; |
| |
| for (V val : values) { |
| count++; |
| } |
| |
| // This time around, iteration should yield no values. |
| for (V val : values) { |
| count++; |
| } |
| c.write(key, new LongWritable(count)); |
| } |
| } |
| |
| @Test |
| public void testDoubleIteration() { |
| reducer = new DoubleIterReducer<Text, LongWritable>(); |
| driver = new ReduceDriver<Text, LongWritable, Text, LongWritable>( |
| reducer); |
| |
| driver |
| .withInputKey(new Text("foo")) |
| .withInputValue(new LongWritable(1)) |
| .withInputValue(new LongWritable(1)) |
| .withInputValue(new LongWritable(1)) |
| .withInputValue(new LongWritable(1)) |
| .withOutput(new Text("foo"), new LongWritable(4)) |
| .runTest(); |
| } |
| |
| @Test |
| public void testConfiguration() { |
| Configuration conf = new Configuration(); |
| conf.set("TestKey", "TestValue"); |
| ReduceDriver<NullWritable, NullWritable, NullWritable, NullWritable> confDriver |
| = new ReduceDriver<NullWritable, NullWritable, NullWritable, NullWritable>(); |
| ConfigurationReducer<NullWritable, NullWritable, NullWritable, NullWritable> reducer |
| = new ConfigurationReducer<NullWritable, NullWritable, NullWritable, NullWritable>(); |
| confDriver.withReducer(reducer).withConfiguration(conf). |
| withInput(NullWritable.get(),Arrays.asList(NullWritable.get())). |
| withOutput(NullWritable.get(),NullWritable.get()).runTest(); |
| assertEquals(reducer.setupConfiguration.get("TestKey"), "TestValue"); |
| } |
| |
| /** |
| * Test reducer which stores the configuration object it was passed during its setup method |
| */ |
| public static class ConfigurationReducer<KEYIN, VALUEIN, KEYOUT, VALUEOUT> extends Reducer<KEYIN, VALUEIN, KEYOUT, VALUEOUT> { |
| public Configuration setupConfiguration; |
| |
| @Override |
| protected void setup(Context context) throws IOException, |
| InterruptedException { |
| setupConfiguration = context.getConfiguration(); |
| } |
| } |
| } |
| |