| /** |
| * 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; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.MapReduceBase; |
| import org.apache.hadoop.mapred.Mapper; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.Reducer; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.junit.Test; |
| |
| /** |
| * Test counters usage in various drivers. |
| */ |
| public class TestCounters { |
| |
| private static final String GROUP = "GROUP"; |
| private static final String ELEM = "ELEM"; |
| |
| private class CounterMapper extends MapReduceBase implements |
| Mapper<Text, Text, Text, Text> { |
| @Override |
| public void map(final Text k, final Text v, |
| final OutputCollector<Text, Text> out, final Reporter r) |
| throws IOException { |
| |
| r.incrCounter(GROUP, ELEM, 1); |
| |
| // Emit the same (k, v) pair twice. |
| out.collect(k, v); |
| out.collect(k, v); |
| } |
| } |
| |
| private class CounterReducer extends MapReduceBase implements |
| Reducer<Text, Text, Text, Text> { |
| @Override |
| public void reduce(final Text k, final Iterator<Text> vals, |
| final OutputCollector<Text, Text> out, final Reporter r) |
| throws IOException { |
| |
| while (vals.hasNext()) { |
| r.incrCounter(GROUP, ELEM, 1); |
| out.collect(k, vals.next()); |
| } |
| } |
| } |
| |
| @Test |
| public void testMapper() throws IOException { |
| final Mapper<Text, Text, Text, Text> mapper = new CounterMapper(); |
| final MapDriver<Text, Text, Text, Text> driver = MapDriver |
| .newMapDriver(mapper); |
| driver.withInput(new Text("foo"), new Text("bar")).run(); |
| assertEquals("Expected 1 counter increment", 1, driver.getCounters() |
| .findCounter(GROUP, ELEM).getValue()); |
| } |
| |
| @Test |
| @SuppressWarnings("deprecation") |
| public void testReducer() throws IOException { |
| final Reducer<Text, Text, Text, Text> reducer = new CounterReducer(); |
| final ReduceDriver<Text, Text, Text, Text> driver = ReduceDriver |
| .newReduceDriver(reducer); |
| driver.withInputKey(new Text("foo")).withInputValue(new Text("bar")).run(); |
| assertEquals("Expected 1 counter increment", 1, driver.getCounters() |
| .findCounter(GROUP, ELEM).getValue()); |
| } |
| |
| @Test |
| public void testMapReduce() throws IOException { |
| final Mapper<Text, Text, Text, Text> mapper = new CounterMapper(); |
| final Reducer<Text, Text, Text, Text> reducer = new CounterReducer(); |
| final MapReduceDriver<Text, Text, Text, Text, Text, Text> driver = MapReduceDriver |
| .newMapReduceDriver(mapper, reducer); |
| |
| driver.withInput(new Text("foo"), new Text("bar")).run(); |
| |
| assertEquals("Expected counter=3", 3, |
| driver.getCounters().findCounter(GROUP, ELEM).getValue()); |
| } |
| |
| @Test |
| public void testPipeline() throws IOException { |
| final Mapper<Text, Text, Text, Text> mapper = new CounterMapper(); |
| final Reducer<Text, Text, Text, Text> reducer = new CounterReducer(); |
| final PipelineMapReduceDriver<Text, Text, Text, Text> driver = PipelineMapReduceDriver.newPipelineMapReduceDriver(); |
| |
| driver.withMapReduce(mapper, reducer).withMapReduce(mapper, reducer) |
| .withInput(new Text("foo"), new Text("bar")).run(); |
| |
| assertEquals("Expected counter=9", 9, |
| driver.getCounters().findCounter(GROUP, ELEM).getValue()); |
| } |
| } |