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.trevni.avro.mapreduce;
  
  import java.io.IOException;
  
  import org.apache.avro.mapred.AvroKey;
  import org.apache.avro.mapred.AvroValue;
  import org.apache.hadoop.mapreduce.RecordWriter;
  import org.apache.hadoop.mapreduce.TaskAttemptContext;
  import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
  
  /**
   * An {@link org.apache.hadoop.mapreduce.OutputFormat} that writes Avro data to
   * Trevni files.
   *
   * This implement was modeled off
   * {@link org.apache.avro.mapreduce.AvroKeyValueOutputFormat} to allow for easy
   * transition
   *
   * * FileOutputFormat for writing Trevni container files of key/value pairs.
   *
   * <p>
   * Since Trevni 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>.
   *
   *            <p>
   *            Writes a directory of files per task, each comprising a single
   *            filesystem block. To reduce the number of files, increase the
   *            default filesystem block size for the job. Each task also requires
   *            enough memory to buffer a filesystem block.
   */
  public class AvroTrevniKeyValueOutputFormat<K, V> extends FileOutputFormat<AvroKey<K>, AvroValue<V>> {
  
    /** {@inheritDoc} */
    @Override
    public RecordWriter<AvroKey<K>, AvroValue<V>> getRecordWriter(TaskAttemptContext context)
        throws IOException, InterruptedException {
  
      return new AvroTrevniKeyValueRecordWriter<>(context);
    }
  }
  