about云hadoop源码分析之如何获取任务名字及进度【hadoop2.7.1】
问题导读
1.你认为如何获取hadoop mapreduce任务名字？
2.你认为如何获取hadoop mapreduce？
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有很多新手经常问，该如何获取任务的进度，有没有这方面的API。
答案是有的。具体在哪各类或则接口中？
我们找到包：
package org.apache.hadoop.mapreduce;
中TaskAttemptContext接口
/**
* 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;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.util.Progressable;
/**
* The context for task attempts.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface TaskAttemptContext extends JobContext, Progressable {
/**
* Get the unique name for this task attempt.
*/
public TaskAttemptID getTaskAttemptID();
/**
* Set the current status of the task to the given string.
*/
public void setStatus(String msg);
/**
* Get the last set status message.
* @return the current status message
*/
public String getStatus();
/**
* The current progress of the task attempt.
* @return a number between 0.0 and 1.0 (inclusive) indicating the attempt's
* progress.
*/
public abstract float getProgress();
/**
* Get the {@link Counter} for the given <code>counterName</code>.
* @param counterName counter name
* @return the <code>Counter</code> for the given <code>counterName</code>
*/
public Counter getCounter(Enum<?> counterName);
/**
* Get the {@link Counter} for the given <code>groupName</code> and
* <code>counterName</code>.
* @param counterName counter name
* @return the <code>Counter</code> for the given <code>groupName</code> and
* <code>counterName</code>
*/
public Counter getCounter(String groupName, String counterName);
}
其中
public TaskAttemptID getTaskAttemptID();
为获取任何的名字
public abstract float getProgress();
为任务的当前进度
{:soso_e179:}
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