org.apache.avro.mapred.tether.TetherOutputFormat.java Source code

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Here is the source code for org.apache.avro.mapred.tether.TetherOutputFormat.java

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/**
 * 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();
            }
        };
    }

}