/**
* Licensed to Odiago, Inc. under one or more contributor license
* agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Odiago, Inc.
* 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.*;
import static org.junit.Assert.*;
import java.io.File;
import java.io.IOException;
import org.apache.avro.Schema;
import org.apache.avro.file.SeekableFileInput;
import org.apache.avro.file.SeekableInput;
import org.apache.avro.mapred.AvroKey;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
public class TestAvroKeyRecordReader {
/** A temporary directory for test data. */
@Rule
public TemporaryFolder mTempDir = new TemporaryFolder();
/**
* Verifies that avro records can be read and progress is reported correctly.
*/
@Test
public void testReadRecords() throws IOException, InterruptedException {
// Create the test avro file input with two records:
// 1. "first"
// 2. "second"
final SeekableInput avroFileInput = new SeekableFileInput(
AvroFiles.createFile(new File(mTempDir.getRoot(), "myStringfile.avro"),
Schema.create(Schema.Type.STRING), "first", "second"));
// Create the record reader.
Schema readerSchema = Schema.create(Schema.Type.STRING);
RecordReader<AvroKey<CharSequence>, NullWritable> recordReader
= new AvroKeyRecordReader<CharSequence>(readerSchema) {
@Override
protected SeekableInput createSeekableInput(Configuration conf, Path path)
throws IOException {
return avroFileInput;
}
};
// Set up the job configuration.
Configuration conf = new Configuration();
// Create a mock input split for this record reader.
FileSplit inputSplit = createMock(FileSplit.class);
expect(inputSplit.getPath()).andReturn(new Path("/path/to/an/avro/file")).anyTimes();
expect(inputSplit.getStart()).andReturn(0L).anyTimes();
expect(inputSplit.getLength()).andReturn(avroFileInput.length()).anyTimes();
// Create a mock task attempt context for this record reader.
TaskAttemptContext context = createMock(TaskAttemptContext.class);
expect(context.getConfiguration()).andReturn(conf).anyTimes();
// Initialize the record reader.
replay(inputSplit);
replay(context);
recordReader.initialize(inputSplit, context);
assertEquals("Progress should be zero before any records are read",
0.0f, recordReader.getProgress(), 0.0f);
// Some variables to hold the records.
AvroKey<CharSequence> key;
NullWritable value;
// Read the first record.
assertTrue("Expected at least one record", recordReader.nextKeyValue());
key = recordReader.getCurrentKey();
value = recordReader.getCurrentValue();
assertNotNull("First record had null key", key);
assertNotNull("First record had null value", value);
CharSequence firstString = key.datum();
assertEquals("first", firstString.toString());
assertTrue("getCurrentKey() returned different keys for the same record",
key == recordReader.getCurrentKey());
assertTrue("getCurrentValue() returned different values for the same record",
value == recordReader.getCurrentValue());
// Read the second record.
assertTrue("Expected to read a second record", recordReader.nextKeyValue());
key = recordReader.getCurrentKey();
value = recordReader.getCurrentValue();
assertNotNull("Second record had null key", key);
assertNotNull("Second record had null value", value);
CharSequence secondString = key.datum();
assertEquals("second", secondString.toString());
assertEquals("Progress should be complete (2 out of 2 records processed)",
1.0f, recordReader.getProgress(), 0.0f);
// There should be no more records.
assertFalse("Expected only 2 records", recordReader.nextKeyValue());
// Close the record reader.
recordReader.close();
// Verify the expected calls on the mocks.
verify(inputSplit);
verify(context);
}
}