/**
* 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.mapred.tether;
import java.io.IOException;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.util.Progressable;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.file.CodecFactory;
import org.apache.avro.mapred.AvroJob;
import org.apache.avro.mapred.AvroOutputFormat;
/** An {@link org.apache.hadoop.mapred.OutputFormat} for Avro data files. */
class TetherOutputFormat
extends FileOutputFormat<TetherData, NullWritable> {
/** Enable output compression using the deflate codec and specify its level.*/
public static void setDeflateLevel(JobConf job, int level) {
FileOutputFormat.setCompressOutput(job, true);
job.setInt(AvroOutputFormat.DEFLATE_LEVEL_KEY, level);
}
@SuppressWarnings("unchecked")
public RecordWriter<TetherData, NullWritable>
getRecordWriter(FileSystem ignore, JobConf job,
String name, Progressable prog)
throws IOException {
Schema schema = AvroJob.getOutputSchema(job);
final DataFileWriter writer = new DataFileWriter(new GenericDatumWriter());
if (FileOutputFormat.getCompressOutput(job)) {
int level = job.getInt(AvroOutputFormat.DEFLATE_LEVEL_KEY,
AvroOutputFormat.DEFAULT_DEFLATE_LEVEL);
writer.setCodec(CodecFactory.deflateCodec(level));
}
Path path =
FileOutputFormat.getTaskOutputPath(job, name+AvroOutputFormat.EXT);
writer.create(schema, path.getFileSystem(job).create(path));
return new RecordWriter<TetherData, NullWritable>() {
public void write(TetherData datum, NullWritable ignore)
throws IOException {
writer.appendEncoded(datum.buffer());
}
public void close(Reporter reporter) throws IOException {
writer.close();
}
};
}
}