hadoop ReduceTaskAttemptImpl 源码
haddop ReduceTaskAttemptImpl 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/ReduceTaskAttemptImpl.java
/**
* 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 org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.MRJobConfig;
import org.apache.hadoop.mapreduce.TypeConverter;
import org.apache.hadoop.mapreduce.security.token.JobTokenIdentifier;
import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
import org.apache.hadoop.mapreduce.v2.app.AppContext;
import org.apache.hadoop.mapreduce.v2.app.TaskAttemptListener;
import org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.yarn.event.EventHandler;
import org.apache.hadoop.yarn.util.Clock;
@SuppressWarnings("rawtypes")
public class ReduceTaskAttemptImpl extends TaskAttemptImpl {
private final int numMapTasks;
public ReduceTaskAttemptImpl(TaskId id, int attempt,
EventHandler eventHandler, Path jobFile, int partition,
int numMapTasks, JobConf conf,
TaskAttemptListener taskAttemptListener,
Token<JobTokenIdentifier> jobToken,
Credentials credentials, Clock clock,
AppContext appContext) {
super(id, attempt, eventHandler, taskAttemptListener, jobFile, partition,
conf, new String[] {}, jobToken, credentials, clock,
appContext);
this.numMapTasks = numMapTasks;
}
@Override
public Task createRemoteTask() {
//job file name is set in TaskAttempt, setting it null here
ReduceTask reduceTask =
new ReduceTask("", TypeConverter.fromYarn(getID()), partition,
numMapTasks, 1); // YARN doesn't have the concept of slots per task, set it as 1.
reduceTask.setUser(conf.get(MRJobConfig.USER_NAME));
reduceTask.setConf(conf);
return reduceTask;
}
}
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