| /* |
| * 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.mapred; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.StringTokenizer; |
| import org.apache.avro.Schema; |
| import org.apache.avro.util.Utf8; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.mapred.FileInputFormat; |
| import org.apache.hadoop.mapred.FileOutputFormat; |
| import org.apache.hadoop.mapred.FileSplit; |
| import org.apache.hadoop.mapred.JobClient; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.junit.ClassRule; |
| import org.junit.Test; |
| import org.junit.rules.TemporaryFolder; |
| |
| public class TestWordCount { |
| |
| @ClassRule |
| public static TemporaryFolder INPUT_DIR = new TemporaryFolder(); |
| |
| @ClassRule |
| public static TemporaryFolder OUTPUT_DIR = new TemporaryFolder(); |
| |
| public static class MapImpl extends AvroMapper<Utf8, Pair<Utf8, Long>> { |
| @Override |
| public void map(Utf8 text, AvroCollector<Pair<Utf8, Long>> collector, Reporter reporter) throws IOException { |
| StringTokenizer tokens = new StringTokenizer(text.toString()); |
| while (tokens.hasMoreTokens()) |
| collector.collect(new Pair<>(new Utf8(tokens.nextToken()), 1L)); |
| } |
| } |
| |
| public static class ReduceImpl extends AvroReducer<Utf8, Long, Pair<Utf8, Long>> { |
| @Override |
| public void reduce(Utf8 word, Iterable<Long> counts, AvroCollector<Pair<Utf8, Long>> collector, Reporter reporter) |
| throws IOException { |
| long sum = 0; |
| for (long count : counts) |
| sum += count; |
| collector.collect(new Pair<>(word, sum)); |
| } |
| } |
| |
| @Test |
| public void runTestsInOrder() throws Exception { |
| String pathOut = OUTPUT_DIR.getRoot().getPath(); |
| testJob(pathOut); |
| testProjection(pathOut); |
| } |
| |
| @SuppressWarnings("deprecation") |
| public void testJob(String pathOut) throws Exception { |
| JobConf job = new JobConf(); |
| String pathIn = INPUT_DIR.getRoot().getPath(); |
| |
| WordCountUtil.writeLinesFile(pathIn + "/lines.avro"); |
| |
| Path outputPath = new Path(pathOut); |
| outputPath.getFileSystem(job).delete(outputPath); |
| |
| job.setJobName("wordcount"); |
| |
| AvroJob.setInputSchema(job, Schema.create(Schema.Type.STRING)); |
| AvroJob.setOutputSchema(job, new Pair<Utf8, Long>(new Utf8(""), 0L).getSchema()); |
| |
| AvroJob.setMapperClass(job, MapImpl.class); |
| AvroJob.setCombinerClass(job, ReduceImpl.class); |
| AvroJob.setReducerClass(job, ReduceImpl.class); |
| |
| FileInputFormat.setInputPaths(job, new Path(pathIn)); |
| FileOutputFormat.setOutputPath(job, new Path(pathOut)); |
| FileOutputFormat.setCompressOutput(job, true); |
| |
| WordCountUtil.setMeta(job); |
| |
| JobClient.runJob(job); |
| |
| WordCountUtil.validateCountsFile(new File(pathOut, "part-00000.avro")); |
| } |
| |
| @SuppressWarnings("deprecation") |
| public void testProjection(String inputPathString) throws Exception { |
| JobConf job = new JobConf(); |
| |
| Integer defaultRank = -1; |
| |
| String jsonSchema = "{\"type\":\"record\"," + "\"name\":\"org.apache.avro.mapred.Pair\"," + "\"fields\": [ " |
| + "{\"name\":\"rank\", \"type\":\"int\", \"default\": -1}," + "{\"name\":\"value\", \"type\":\"long\"}" + "]}"; |
| |
| Schema readerSchema = Schema.parse(jsonSchema); |
| |
| AvroJob.setInputSchema(job, readerSchema); |
| |
| Path inputPath = new Path(inputPathString + "/part-00000.avro"); |
| FileStatus fileStatus = FileSystem.get(job).getFileStatus(inputPath); |
| FileSplit fileSplit = new FileSplit(inputPath, 0, fileStatus.getLen(), job); |
| |
| AvroRecordReader<Pair<Integer, Long>> recordReader = new AvroRecordReader<>(job, fileSplit); |
| |
| AvroWrapper<Pair<Integer, Long>> inputPair = new AvroWrapper<>(null); |
| NullWritable ignore = NullWritable.get(); |
| |
| long sumOfCounts = 0; |
| long numOfCounts = 0; |
| while (recordReader.next(inputPair, ignore)) { |
| assertEquals(inputPair.datum().get(0), defaultRank); |
| sumOfCounts += (Long) inputPair.datum().get(1); |
| numOfCounts++; |
| } |
| |
| assertEquals(numOfCounts, WordCountUtil.COUNTS.size()); |
| |
| long actualSumOfCounts = 0; |
| for (Long count : WordCountUtil.COUNTS.values()) { |
| actualSumOfCounts += count; |
| } |
| |
| assertEquals(sumOfCounts, actualSumOfCounts); |
| } |
| |
| } |