content: /*
   * 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
   *
   *     https://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 java.io.IOException;
  import java.io.OutputStream;
  
  import org.apache.avro.generic.GenericData;
  import org.apache.avro.hadoop.io.AvroDatumConverter;
  import org.apache.avro.hadoop.io.AvroDatumConverterFactory;
  import org.apache.avro.hadoop.io.AvroSerialization;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.mapreduce.RecordWriter;
  import org.apache.hadoop.mapreduce.TaskAttemptContext;
  
  /**
   * FileOutputFormat for writing Avro container files of key/value pairs.
   *
   * <p>
   * Since Avro container files can only contain records (not key/value pairs),
   * this output format puts the key and value into an Avro generic record with
   * two fields, named 'key' and 'value'.
   * </p>
   *
   * <p>
   * The keys and values given to this output format may be Avro objects wrapped
   * in <code>AvroKey</code> or <code>AvroValue</code> objects. The basic Writable
   * types are also supported (e.g., IntWritable, Text); they will be converted to
   * their corresponding Avro types.
   * </p>
   *
   * @param <K> The type of key. If an Avro type, it must be wrapped in an
   *            <code>AvroKey</code>.
   * @param <V> The type of value. If an Avro type, it must be wrapped in an
   *            <code>AvroValue</code>.
   */
  public class AvroKeyValueOutputFormat<K, V> extends AvroOutputFormatBase<K, V> {
    /** {@inheritDoc} */
    @Override
    @SuppressWarnings("unchecked")
    public RecordWriter<K, V> getRecordWriter(TaskAttemptContext context) throws IOException {
      Configuration conf = context.getConfiguration();
  
      AvroDatumConverterFactory converterFactory = new AvroDatumConverterFactory(conf);
  
      AvroDatumConverter<K, ?> keyConverter = converterFactory.create((Class<K>) context.getOutputKeyClass());
      AvroDatumConverter<V, ?> valueConverter = converterFactory.create((Class<V>) context.getOutputValueClass());
  
      GenericData dataModel = AvroSerialization.createDataModel(conf);
  
      OutputStream out = getAvroFileOutputStream(context);
      try {
        return new AvroKeyValueRecordWriter<>(keyConverter, valueConverter, dataModel, getCompressionCodec(context), out,
            getSyncInterval(context));
      } catch (IOException e) {
        out.close();
        throw e;
      }
    }
  }
  