| /** |
| * 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.*; |
| |
| import org.apache.hadoop.mapred.TaskTracker.TaskInProgress; |
| import org.apache.log4j.Level; |
| |
| /** Runs a reduce task. */ |
| class ReduceTaskRunner extends TaskRunner { |
| |
| public ReduceTaskRunner(TaskInProgress task, TaskTracker tracker, |
| JobConf conf, TaskTracker.RunningJob rjob |
| ) throws IOException { |
| |
| super(task, tracker, conf, rjob); |
| } |
| |
| /** Assemble all of the map output files */ |
| public boolean prepare() throws IOException { |
| if (!super.prepare()) { |
| return false; |
| } |
| |
| // cleanup from failures |
| mapOutputFile.removeAll(); |
| return true; |
| } |
| |
| |
| /** Delete all of the temporary map output files. */ |
| public void close() throws IOException { |
| LOG.info(getTask()+" done; removing files."); |
| getTask().getProgress().setStatus("closed"); |
| mapOutputFile.removeAll(); |
| } |
| |
| @Override |
| public String getChildJavaOpts(JobConf jobConf, String defaultValue) { |
| String user = |
| jobConf.get(JobConf.MAPRED_REDUCE_TASK_JAVA_OPTS, |
| super.getChildJavaOpts(jobConf, |
| JobConf.DEFAULT_MAPRED_TASK_JAVA_OPTS)); |
| String admin = jobConf.get(TaskRunner.MAPRED_REDUCE_ADMIN_JAVA_OPTS, |
| TaskRunner.DEFAULT_MAPRED_ADMIN_JAVA_OPTS); |
| return user + " " + admin; |
| } |
| |
| @Override |
| public int getChildUlimit(JobConf jobConf) { |
| return jobConf.getInt(JobConf.MAPRED_REDUCE_TASK_ULIMIT, |
| super.getChildUlimit(jobConf)); |
| } |
| |
| @Override |
| public String getChildEnv(JobConf jobConf) { |
| return jobConf.get(JobConf.MAPRED_REDUCE_TASK_ENV, |
| super.getChildEnv(jobConf)); |
| } |
| |
| @Override |
| public Level getLogLevel(JobConf jobConf) { |
| return Level.toLevel(jobConf.get(JobConf.MAPRED_REDUCE_TASK_LOG_LEVEL, |
| JobConf.DEFAULT_LOG_LEVEL.toString()), |
| Level.INFO); |
| } |
| |
| } |