parquet-hive/parquet-hive-storage-handler/src/main/java/org/apache/hadoop/hive/ql/io/parquet/MapredParquetInputFormat.java

/* 
 * 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.hadoop.hive.ql.io.parquet;

import java.io.IOException;

import org.apache.hadoop.hive.ql.io.parquet.read.DataWritableReadSupport;
import org.apache.hadoop.hive.ql.io.parquet.read.ParquetRecordReaderWrapper;
import org.apache.hadoop.io.ArrayWritable;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.RecordReader;

import org.apache.parquet.hadoop.ParquetInputFormat;


/**
 *
 * A Parquet InputFormat for Hive (with the deprecated package mapred)
 *
 */
public class MapredParquetInputFormat extends FileInputFormat<Void, ArrayWritable> {

  private final ParquetInputFormat<ArrayWritable> realInput;

  public MapredParquetInputFormat() {
    this(new ParquetInputFormat<ArrayWritable>(DataWritableReadSupport.class));
  }

  protected MapredParquetInputFormat(final ParquetInputFormat<ArrayWritable> inputFormat) {
    this.realInput = inputFormat;
  }

  @Override
  public org.apache.hadoop.mapred.RecordReader<Void, ArrayWritable> getRecordReader(
      final org.apache.hadoop.mapred.InputSplit split,
      final org.apache.hadoop.mapred.JobConf job,
      final org.apache.hadoop.mapred.Reporter reporter
      ) throws IOException {
    try {
      return (RecordReader<Void, ArrayWritable>) new ParquetRecordReaderWrapper(realInput, split, job, reporter);
    } catch (final InterruptedException e) {
      throw new RuntimeException("Cannot create a RecordReaderWrapper", e);
    }
  }
}