| /** |
| * 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.crunch.lib; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.apache.crunch.types.avro.Avros.ints; |
| import static org.apache.crunch.types.avro.Avros.records; |
| import static org.apache.crunch.types.avro.Avros.strings; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.util.List; |
| |
| import org.apache.avro.file.DataFileWriter; |
| import org.apache.avro.specific.SpecificDatumWriter; |
| import org.apache.crunch.MapFn; |
| import org.apache.crunch.PCollection; |
| import org.apache.crunch.impl.mr.MRPipeline; |
| import org.apache.crunch.io.At; |
| import org.apache.crunch.test.Person; |
| import org.apache.crunch.test.TemporaryPath; |
| import org.apache.crunch.test.TemporaryPaths; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Rule; |
| import org.junit.Test; |
| |
| import com.google.common.collect.Lists; |
| |
| /** |
| * Test sorting Avro types by selected inner field |
| */ |
| public class AvroTypeSortIT implements Serializable { |
| |
| private static final long serialVersionUID = 1344118240353796561L; |
| |
| private transient File avroFile; |
| @Rule |
| public transient TemporaryPath tmpDir = TemporaryPaths.create(); |
| |
| @Before |
| public void setUp() throws IOException { |
| avroFile = File.createTempFile("avrotest", ".avro"); |
| } |
| |
| @After |
| public void tearDown() { |
| avroFile.delete(); |
| } |
| |
| @Test |
| public void testSortAvroTypesBySelectedFields() throws Exception { |
| |
| MRPipeline pipeline = new MRPipeline(AvroTypeSortIT.class, tmpDir.getDefaultConfiguration()); |
| |
| Person ccc10 = createPerson("CCC", 10); |
| Person bbb20 = createPerson("BBB", 20); |
| Person aaa30 = createPerson("AAA", 30); |
| |
| writeAvroFile(Lists.newArrayList(ccc10, bbb20, aaa30), avroFile); |
| |
| PCollection<Person> unsorted = pipeline.read(At.avroFile(avroFile.getAbsolutePath(), records(Person.class))); |
| |
| // Sort by Name |
| MapFn<Person, String> nameExtractor = new MapFn<Person, String>() { |
| |
| @Override |
| public String map(Person input) { |
| return input.name.toString(); |
| } |
| }; |
| |
| PCollection<Person> sortedByName = unsorted.by(nameExtractor, strings()).groupByKey().ungroup().values(); |
| |
| List<Person> sortedByNameList = Lists.newArrayList(sortedByName.materialize()); |
| |
| assertEquals(3, sortedByNameList.size()); |
| assertEquals(aaa30, sortedByNameList.get(0)); |
| assertEquals(bbb20, sortedByNameList.get(1)); |
| assertEquals(ccc10, sortedByNameList.get(2)); |
| |
| // Sort by Age |
| |
| MapFn<Person, Integer> ageExtractor = new MapFn<Person, Integer>() { |
| |
| @Override |
| public Integer map(Person input) { |
| return input.age; |
| } |
| }; |
| |
| PCollection<Person> sortedByAge = unsorted.by(ageExtractor, ints()).groupByKey().ungroup().values(); |
| |
| List<Person> sortedByAgeList = Lists.newArrayList(sortedByAge.materialize()); |
| |
| assertEquals(3, sortedByAgeList.size()); |
| assertEquals(ccc10, sortedByAgeList.get(0)); |
| assertEquals(bbb20, sortedByAgeList.get(1)); |
| assertEquals(aaa30, sortedByAgeList.get(2)); |
| |
| pipeline.done(); |
| } |
| |
| private static void writeAvroFile(List<Person> people, File avroFile) throws IOException { |
| |
| FileOutputStream outputStream = new FileOutputStream(avroFile); |
| SpecificDatumWriter<Person> writer = new SpecificDatumWriter<Person>(Person.class); |
| |
| DataFileWriter<Person> dataFileWriter = new DataFileWriter<Person>(writer); |
| dataFileWriter.create(Person.SCHEMA$, outputStream); |
| for (Person person : people) { |
| dataFileWriter.append(person); |
| } |
| dataFileWriter.close(); |
| outputStream.close(); |
| } |
| |
| private static Person createPerson(String name, int age) { |
| |
| Person person = new Person(); |
| person.age = age; |
| person.name = name; |
| person.siblingnames = Lists.newArrayList(); |
| |
| return person; |
| } |
| } |