/
TestFileSystemDatasetReader.java
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/
TestFileSystemDatasetReader.java
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/**
* Copyright 2013 Cloudera Inc.
*
* Licensed 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 com.cloudera.data.filesystem;
import com.cloudera.data.DatasetReader;
import com.google.common.collect.Lists;
import com.google.common.io.Resources;
import java.io.IOException;
import org.apache.avro.Schema;
import org.apache.avro.Schema.Field;
import org.apache.avro.Schema.Type;
import org.apache.avro.generic.GenericData.Record;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.codehaus.jackson.node.JsonNodeFactory;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import static com.cloudera.data.filesystem.DatasetTestUtilities.STRING_SCHEMA;
public class TestFileSystemDatasetReader {
private FileSystem fileSystem;
@Before
public void setUp() throws IOException {
fileSystem = FileSystem.get(new Configuration());
}
@Test
public void testRead() throws IOException {
DatasetReader<Record> reader;
int records = 0;
reader = new FileSystemDatasetReader<Record>(fileSystem, new Path(Resources
.getResource("data/strings-100.avro").getFile()), STRING_SCHEMA);
try {
reader.open();
while (reader.hasNext()) {
Record record = reader.read();
Assert.assertNotNull(record);
Assert.assertEquals(String.valueOf(records), record.get("text"));
records++;
}
} finally {
reader.close();
}
Assert.assertEquals(100, records);
}
@Test
public void testEvolvedSchema() throws IOException {
Schema schema = Schema.createRecord("mystring", null, null, false);
schema.setFields(Lists.newArrayList(
new Field("text", Schema.create(Type.STRING), null, null),
new Field("text2", Schema.create(Type.STRING), null,
JsonNodeFactory.instance.textNode("N/A"))));
FileSystemDatasetReader<Record> reader = new FileSystemDatasetReader<Record>(
fileSystem, new Path(Resources.getResource("data/strings-100.avro")
.getFile()), schema);
int records = 0;
try {
reader.open();
while (reader.hasNext()) {
Record record = reader.read();
Assert.assertEquals(String.valueOf(records), record.get("text"));
Assert.assertEquals("N/A", record.get("text2"));
records++;
}
} finally {
reader.close();
}
Assert.assertEquals(100, records);
}
@Test(expected = IllegalStateException.class)
public void testHasNextOnNonOpenWriterFails() throws IOException {
DatasetReader<String> reader;
reader = new FileSystemDatasetReader<String>(fileSystem, new Path(Resources
.getResource("data/strings-100.avro").getFile()), STRING_SCHEMA);
try {
reader.hasNext();
} finally {
reader.close();
}
}
}