| /* |
| * 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 |
| * |
| * https://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.avro.mapreduce; |
| |
| import static org.junit.Assert.*; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.net.URISyntaxException; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.file.DataFileReader; |
| import org.apache.avro.generic.GenericRecord; |
| import org.apache.avro.hadoop.io.AvroKeyValue; |
| import org.apache.avro.io.DatumReader; |
| import org.apache.avro.specific.SpecificDatumReader; |
| 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.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.Mapper; |
| import org.apache.hadoop.mapreduce.Reducer; |
| import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; |
| import org.apache.hadoop.mapreduce.lib.input.TextInputFormat; |
| import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.rules.TemporaryFolder; |
| |
| public class TestKeyValueWordCount { |
| @Rule |
| public TemporaryFolder mTempDir = new TemporaryFolder(); |
| |
| public static class LineCountMapper extends Mapper<LongWritable, Text, Text, IntWritable> { |
| private IntWritable mOne; |
| |
| @Override |
| protected void setup(Context context) { |
| mOne = new IntWritable(1); |
| } |
| |
| @Override |
| protected void map(LongWritable fileByteOffset, Text line, Context context) |
| throws IOException, InterruptedException { |
| context.write(line, mOne); |
| } |
| } |
| |
| public static class IntSumReducer extends Reducer<Text, IntWritable, Text, IntWritable> { |
| @Override |
| protected void reduce(Text word, Iterable<IntWritable> counts, Context context) |
| throws IOException, InterruptedException { |
| int sum = 0; |
| for (IntWritable count : counts) { |
| sum += count.get(); |
| } |
| context.write(word, new IntWritable(sum)); |
| } |
| } |
| |
| @Test |
| public void testKeyValueMapReduce() |
| throws ClassNotFoundException, IOException, InterruptedException, URISyntaxException { |
| // Configure a word count job over our test input file. |
| Job job = Job.getInstance(); |
| FileInputFormat.setInputPaths(job, |
| new Path(getClass().getResource("/org/apache/avro/mapreduce/mapreduce-test-input.txt").toURI().toString())); |
| job.setInputFormatClass(TextInputFormat.class); |
| |
| job.setMapperClass(LineCountMapper.class); |
| job.setMapOutputKeyClass(Text.class); |
| job.setMapOutputValueClass(IntWritable.class); |
| |
| job.setReducerClass(IntSumReducer.class); |
| job.setOutputKeyClass(Text.class); |
| job.setOutputValueClass(IntWritable.class); |
| |
| job.setOutputFormatClass(AvroKeyValueOutputFormat.class); |
| Path outputPath = new Path(mTempDir.getRoot().getPath() + "/out-wordcount"); |
| FileOutputFormat.setOutputPath(job, outputPath); |
| |
| // Run the job. |
| assertTrue(job.waitForCompletion(true)); |
| |
| // Verify that the Avro container file generated had the right KeyValuePair |
| // generic records. |
| File avroFile = new File(outputPath.toString(), "part-r-00000.avro"); |
| DatumReader<GenericRecord> datumReader = new SpecificDatumReader<>( |
| AvroKeyValue.getSchema(Schema.create(Schema.Type.STRING), Schema.create(Schema.Type.INT))); |
| DataFileReader<GenericRecord> avroFileReader = new DataFileReader<>(avroFile, datumReader); |
| |
| assertTrue(avroFileReader.hasNext()); |
| AvroKeyValue<CharSequence, Integer> appleRecord = new AvroKeyValue<>(avroFileReader.next()); |
| assertNotNull(appleRecord.get()); |
| assertEquals("apple", appleRecord.getKey().toString()); |
| assertEquals(3, appleRecord.getValue().intValue()); |
| |
| assertTrue(avroFileReader.hasNext()); |
| AvroKeyValue<CharSequence, Integer> bananaRecord = new AvroKeyValue<>(avroFileReader.next()); |
| assertNotNull(bananaRecord.get()); |
| assertEquals("banana", bananaRecord.getKey().toString()); |
| assertEquals(2, bananaRecord.getValue().intValue()); |
| |
| assertTrue(avroFileReader.hasNext()); |
| AvroKeyValue<CharSequence, Integer> carrotRecord = new AvroKeyValue<>(avroFileReader.next()); |
| assertEquals("carrot", carrotRecord.getKey().toString()); |
| assertEquals(1, carrotRecord.getValue().intValue()); |
| |
| assertFalse(avroFileReader.hasNext()); |
| avroFileReader.close(); |
| } |
| } |