/**
* 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.test.system;
import java.io.IOException;
import org.apache.hadoop.mapreduce.JobID;
import org.apache.hadoop.mapreduce.TaskID;
import org.apache.hadoop.test.system.DaemonProtocol;
/**
* Client side API's exposed from JobTracker.
*/
public interface JTProtocol extends DaemonProtocol {
long versionID = 1L;
/**
* Get the information pertaining to given job.<br/>
* The returned JobInfo object can be null when the
* specified job by the job id is retired from the
* JobTracker memory which happens after job is
* completed. <br/>
*
* @param id
* of the job for which information is required.
* @return information of regarding job null if job is
* retired from JobTracker memory.
* @throws IOException
*/
public JobInfo getJobInfo(JobID jobID) throws IOException;
/**
* Gets the information pertaining to a task. <br/>
* The returned TaskInfo object can be null when the
* specified task specified by the task id is retired
* from the JobTracker memory which happens after the
* job is completed. <br/>
* @param id
* of the task for which information is required.
* @return information of regarding the task null if the
* task is retired from JobTracker memory.
* @throws IOException
*/
public TaskInfo getTaskInfo(TaskID taskID) throws IOException;
/**
* Gets the information pertaining to a given TaskTracker. <br/>
* The returned TTInfo class can be null if the given TaskTracker
* information is removed from JobTracker memory which is done
* when the TaskTracker is marked lost by the JobTracker. <br/>
* @param name
* of the tracker.
* @return information regarding the tracker null if the TaskTracker
* is marked lost by the JobTracker.
* @throws IOException
*/
public TTInfo getTTInfo(String trackerName) throws IOException;
/**
* Gets a list of all available jobs with JobTracker.<br/>
*
* @return list of all jobs.
* @throws IOException
*/
public JobInfo[] getAllJobInfo() throws IOException;
/**
* Gets a list of tasks pertaining to a job. <br/>
*
* @param id
* of the job.
*
* @return list of all tasks for the job.
* @throws IOException
*/
public TaskInfo[] getTaskInfo(JobID jobID) throws IOException;
/**
* Gets a list of TaskTrackers which have reported to the JobTracker. <br/>
*
* @return list of all TaskTracker.
* @throws IOException
*/
public TTInfo[] getAllTTInfo() throws IOException;
/**
* Checks if a given job is retired from the JobTrackers Memory. <br/>
*
* @param id
* of the job
* @return true if job is retired.
* @throws IOException
*/
boolean isJobRetired(JobID jobID) throws IOException;
/**
* Gets the location of the history file for a retired job. <br/>
*
* @param id
* of the job
* @return location of history file
* @throws IOException
*/
String getJobHistoryLocationForRetiredJob(JobID jobID) throws IOException;
}