| /** |
| * 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.mapred; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** Default {@link MapRunnable} implementation.*/ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class MapRunner<K1, V1, K2, V2> |
| implements MapRunnable<K1, V1, K2, V2> { |
| |
| private Mapper<K1, V1, K2, V2> mapper; |
| private boolean incrProcCount; |
| |
| @SuppressWarnings("unchecked") |
| public void configure(JobConf job) { |
| this.mapper = ReflectionUtils.newInstance(job.getMapperClass(), job); |
| //increment processed counter only if skipping feature is enabled |
| this.incrProcCount = SkipBadRecords.getMapperMaxSkipRecords(job)>0 && |
| SkipBadRecords.getAutoIncrMapperProcCount(job); |
| } |
| |
| public void run(RecordReader<K1, V1> input, OutputCollector<K2, V2> output, |
| Reporter reporter) |
| throws IOException { |
| try { |
| // allocate key & value instances that are re-used for all entries |
| K1 key = input.createKey(); |
| V1 value = input.createValue(); |
| |
| while (input.next(key, value)) { |
| // map pair to output |
| mapper.map(key, value, output, reporter); |
| if(incrProcCount) { |
| reporter.incrCounter(SkipBadRecords.COUNTER_GROUP, |
| SkipBadRecords.COUNTER_MAP_PROCESSED_RECORDS, 1); |
| } |
| } |
| } finally { |
| mapper.close(); |
| } |
| } |
| |
| protected Mapper<K1, V1, K2, V2> getMapper() { |
| return mapper; |
| } |
| } |