| /** |
| * 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 org.apache.avro.mapred.AvroKey; |
| import org.apache.avro.mapred.AvroValue; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.mapreduce.lib.input.CombineFileInputFormat; |
| import org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader; |
| import org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReaderWrapper; |
| import org.apache.hadoop.mapreduce.lib.input.CombineFileSplit; |
| |
| /** |
| * A combine avro keyvalue file input format that can combine small avro files |
| * into mappers. |
| * |
| * @param <K> The type of the Avro key to read. |
| * @param <V> The type of the Avro value to read. |
| */ |
| public class CombineAvroKeyValueFileInputFormat<K, V> extends CombineFileInputFormat<AvroKey<K>, AvroValue<V>> { |
| |
| @Override |
| public RecordReader<AvroKey<K>, AvroValue<V>> createRecordReader(InputSplit inputSplit, |
| TaskAttemptContext taskAttemptContext) throws IOException { |
| return new CombineFileRecordReader((CombineFileSplit) inputSplit, taskAttemptContext, |
| CombineAvroKeyValueFileInputFormat.AvroKeyValueFileRecordReaderWrapper.class); |
| } |
| |
| /** |
| * A record reader that may be passed to <code>CombineFileRecordReader</code> so |
| * that it can be used in a <code>CombineFileInputFormat</code>-equivalent for |
| * <code>AvroKeyValueInputFormat</code>. |
| * |
| * @see CombineFileRecordReader |
| * @see CombineFileInputFormat |
| * @see AvroKeyValueInputFormat |
| */ |
| private static class AvroKeyValueFileRecordReaderWrapper<K, V> |
| extends CombineFileRecordReaderWrapper<AvroKey<K>, AvroValue<V>> { |
| // this constructor signature is required by CombineFileRecordReader |
| public AvroKeyValueFileRecordReaderWrapper(CombineFileSplit split, TaskAttemptContext context, Integer idx) |
| throws IOException, InterruptedException { |
| super(new AvroKeyValueInputFormat<>(), split, context, idx); |
| } |
| } |
| } |