| /* |
| * 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.mapred; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.MapReduceBase; |
| import org.apache.hadoop.mapred.Mapper; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * Bridge between a {@link org.apache.hadoop.mapred.Mapper} and an |
| * {@link AvroMapper}. Outputs are written directly when a job is map-only, but |
| * are otherwise assumed to be pairs that are split. |
| */ |
| class HadoopMapper<IN, OUT, K, V, KO, VO> extends MapReduceBase |
| implements Mapper<AvroWrapper<IN>, NullWritable, KO, VO> { |
| |
| private AvroMapper<IN, OUT> mapper; |
| private MapCollector<OUT, K, V, KO, VO> out; |
| private boolean isMapOnly; |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public void configure(JobConf conf) { |
| this.mapper = ReflectionUtils.newInstance(conf.getClass(AvroJob.MAPPER, AvroMapper.class, AvroMapper.class), conf); |
| this.isMapOnly = conf.getNumReduceTasks() == 0; |
| } |
| |
| @Override |
| public void map(AvroWrapper<IN> wrapper, NullWritable value, OutputCollector<KO, VO> collector, Reporter reporter) |
| throws IOException { |
| if (this.out == null) |
| this.out = new MapCollector<>(collector, isMapOnly); |
| mapper.map(wrapper.datum(), out, reporter); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| this.mapper.close(); |
| } |
| |
| } |