/**
* 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.avro.mapreduce;
import static org.easymock.EasyMock.createMock;
import static org.easymock.EasyMock.replay;
import static org.easymock.EasyMock.verify;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.avro.Schema;
import org.apache.avro.file.CodecFactory;
import org.apache.avro.file.DataFileReader;
import org.apache.avro.file.DataFileStream;
import org.apache.avro.generic.GenericData;
import org.apache.avro.io.DatumReader;
import org.apache.avro.mapred.AvroKey;
import org.apache.avro.mapred.FsInput;
import org.apache.avro.reflect.ReflectData;
import org.apache.avro.specific.SpecificDatumReader;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.junit.Test;
public class TestAvroKeyRecordWriter {
@Test
public void testWrite() throws IOException {
Schema writerSchema = Schema.create(Schema.Type.INT);
GenericData dataModel = new ReflectData();
CodecFactory compressionCodec = CodecFactory.nullCodec();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
TaskAttemptContext context = createMock(TaskAttemptContext.class);
replay(context);
// Write an avro container file with two records: 1 and 2.
AvroKeyRecordWriter<Integer> recordWriter = new AvroKeyRecordWriter<Integer>(
writerSchema, dataModel, compressionCodec, outputStream);
recordWriter.write(new AvroKey<Integer>(1), NullWritable.get());
recordWriter.write(new AvroKey<Integer>(2), NullWritable.get());
recordWriter.close(context);
verify(context);
// Verify that the file was written as expected.
InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
Schema readerSchema = Schema.create(Schema.Type.INT);
DatumReader<Integer> datumReader = new SpecificDatumReader<Integer>(readerSchema);
DataFileStream<Integer> dataFileReader = new DataFileStream<Integer>(inputStream, datumReader);
assertTrue(dataFileReader.hasNext()); // Record 1.
assertEquals(1, dataFileReader.next().intValue());
assertTrue(dataFileReader.hasNext()); // Record 2.
assertEquals(2, dataFileReader.next().intValue());
assertFalse(dataFileReader.hasNext()); // No more records.
dataFileReader.close();
}
@Test
public void testSycnableWrite() throws IOException {
Schema writerSchema = Schema.create(Schema.Type.INT);
GenericData dataModel = new ReflectData();
CodecFactory compressionCodec = CodecFactory.nullCodec();
FileOutputStream outputStream = new FileOutputStream(new File("target/temp.avro"));
TaskAttemptContext context = createMock(TaskAttemptContext.class);
replay(context);
// Write an avro container file with two records: 1 and 2.
AvroKeyRecordWriter<Integer> recordWriter = new AvroKeyRecordWriter<Integer>(
writerSchema, dataModel, compressionCodec, outputStream);
long positionOne = recordWriter.sync();
recordWriter.write(new AvroKey<Integer>(1), NullWritable.get());
long positionTwo = recordWriter.sync();
recordWriter.write(new AvroKey<Integer>(2), NullWritable.get());
recordWriter.close(context);
verify(context);
// Verify that the file was written as expected.
Configuration conf = new Configuration();
conf.set("fs.default.name", "file:///");
Path avroFile = new Path("target/temp.avro");
DataFileReader<GenericData.Record> dataFileReader = new DataFileReader<GenericData.Record>(new FsInput(avroFile,
conf), new SpecificDatumReader<GenericData.Record>());
dataFileReader.seek(positionTwo);
assertTrue(dataFileReader.hasNext()); // Record 2.
assertEquals(2, dataFileReader.next());
dataFileReader.seek(positionOne);
assertTrue(dataFileReader.hasNext()); // Record 1.
assertEquals(1, dataFileReader.next());
dataFileReader.close();
}
}