| /** |
| * 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.avro.mapred.tether; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.Reducer; |
| import org.apache.hadoop.mapred.Reporter; |
| |
| import org.apache.avro.mapred.AvroJob; |
| |
| class TetherReducer |
| implements Reducer<TetherData,NullWritable,TetherData,NullWritable> { |
| |
| private JobConf job; |
| private TetheredProcess process; |
| private boolean error; |
| |
| public void configure(JobConf job) { |
| this.job = job; |
| } |
| |
| public void reduce(TetherData datum, Iterator<NullWritable> ignore, |
| OutputCollector<TetherData, NullWritable> collector, |
| Reporter reporter) throws IOException { |
| try { |
| if (process == null) { |
| process = new TetheredProcess(job, collector, reporter); |
| process.inputClient.configure |
| (TaskType.REDUCE, |
| AvroJob.getMapOutputSchema(job).toString(), |
| AvroJob.getOutputSchema(job).toString()); |
| } |
| process.inputClient.input(datum.buffer(), datum.count()); |
| } catch (IOException e) { |
| error = true; |
| throw e; |
| } catch (Exception e) { |
| error = true; |
| throw new IOException(e); |
| } |
| } |
| |
| /** |
| * Handle the end of the input by closing down the application. |
| */ |
| public void close() throws IOException { |
| if (process == null) return; |
| try { |
| if (error) |
| process.inputClient.abort(); |
| else |
| process.inputClient.complete(); |
| process.outputService.waitForFinish(); |
| } catch (InterruptedException e) { |
| throw new IOException(e); |
| } finally { |
| process.close(); |
| } |
| } |
| } |