hadoop Task 源码
haddop Task 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/Task.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.mapreduce.v2.app.job;
import java.util.Map;
import org.apache.hadoop.mapreduce.Counters;
import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskReport;
import org.apache.hadoop.mapreduce.v2.api.records.TaskState;
import org.apache.hadoop.mapreduce.v2.api.records.TaskType;
/**
* Read only view of Task.
*/
public interface Task {
TaskId getID();
TaskReport getReport();
TaskState getState();
Counters getCounters();
float getProgress();
TaskType getType();
Map<TaskAttemptId, TaskAttempt> getAttempts();
TaskAttempt getAttempt(TaskAttemptId attemptID);
/** Has Task reached the final state or not.
*/
boolean isFinished();
/**
* Can the output of the taskAttempt be committed. Note that once the task
* gives a go for a commit, further canCommit requests from any other attempts
* should return false.
*
* @param taskAttemptID
* @return whether the attempt's output can be committed or not.
*/
boolean canCommit(TaskAttemptId taskAttemptID);
}
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