| /** |
| * 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.trevni.avro.mapreduce; |
| |
| import java.io.IOException; |
| |
| import org.apache.avro.mapred.AvroKey; |
| import org.apache.hadoop.io.NullWritable; |
| 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.FileInputFormat; |
| |
| /** |
| * An {@link org.apache.hadoop.mapreduce.InputFormat} for Trevni files. |
| * |
| * This implement was modeled off |
| * {@link org.apache.avro.mapreduce.AvroKeyInputFormat} to allow for easy |
| * transition |
| * |
| * A MapReduce InputFormat that can handle Trevni container files. |
| * |
| * <p>Keys are AvroKey wrapper objects that contain the Trevni data. Since Trevni |
| * container files store only records (not key/value pairs), the value from |
| * this InputFormat is a NullWritable.</p> |
| * |
| * <p> |
| * A subset schema to be read may be specified with |
| * {@link org.apache.avro.mapreduce.AvroJob#setInputKeySchema}. |
| */ |
| public class AvroTrevniKeyInputFormat<T> extends FileInputFormat<AvroKey<T>, NullWritable> { |
| |
| @Override |
| public RecordReader<AvroKey<T>, NullWritable> createRecordReader( |
| InputSplit split, TaskAttemptContext context) throws IOException, |
| InterruptedException { |
| |
| return new AvroTrevniKeyRecordReader<T>(); |
| } |
| |
| } |