com.linkedin.haivvreo.AvroContainerOutputFormat.java Source code

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Here is the source code for com.linkedin.haivvreo.AvroContainerOutputFormat.java

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/*
 * Copyright 2011 LinkedIn
 *
 * 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.linkedin.haivvreo;

import static org.apache.avro.file.DataFileConstants.DEFLATE_CODEC;
import static org.apache.avro.mapred.AvroJob.OUTPUT_CODEC;
import static org.apache.avro.mapred.AvroOutputFormat.DEFAULT_DEFLATE_LEVEL;
import static org.apache.avro.mapred.AvroOutputFormat.DEFLATE_LEVEL_KEY;

import org.apache.avro.Schema;
import org.apache.avro.file.CodecFactory;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.generic.GenericRecord;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.exec.FileSinkOperator;
import org.apache.hadoop.hive.ql.io.HiveOutputFormat;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.util.Progressable;

import java.io.IOException;
import java.util.Properties;

/**
 * Write to an Avro file from a Hive process.
 */
public class AvroContainerOutputFormat implements HiveOutputFormat<LongWritable, AvroGenericRecordWritable> {

    @Override
    public FileSinkOperator.RecordWriter getHiveRecordWriter(JobConf jobConf, Path path,
            Class<? extends Writable> valueClass, boolean isCompressed, Properties properties,
            Progressable progressable) throws IOException {
        Schema schema;
        try {
            schema = HaivvreoUtils.determineSchemaOrThrowException(properties);
        } catch (HaivvreoException e) {
            throw new IOException(e);
        }
        GenericDatumWriter<GenericRecord> gdw = new GenericDatumWriter<GenericRecord>(schema);
        DataFileWriter<GenericRecord> dfw = new DataFileWriter<GenericRecord>(gdw);

        if (isCompressed) {
            int level = jobConf.getInt(DEFLATE_LEVEL_KEY, DEFAULT_DEFLATE_LEVEL);
            String codecName = jobConf.get(OUTPUT_CODEC, DEFLATE_CODEC);
            CodecFactory factory = codecName.equals(DEFLATE_CODEC) ? CodecFactory.deflateCodec(level)
                    : CodecFactory.fromString(codecName);
            dfw.setCodec(factory);
        }

        dfw.create(schema, path.getFileSystem(jobConf).create(path));
        return new AvroGenericRecordWriter(dfw);
    }

}