org.apache.hadoop.mapreduce.lib.jobcontrol

类 JobControl

java.lang.Object

org.apache.hadoop.mapreduce.lib.jobcontrol.JobControl

所有已实现的接口:

Runnable

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class JobControl
extends Object
implements Runnable

This class encapsulates a set of MapReduce jobs and its dependency. It tracks the states of the jobs by placing them into different tables according to their states. This class provides APIs for the client app to add a job to the group and to get the jobs in the group in different states. When a job is added, an ID unique to the group is assigned to the job. This class has a thread that submits jobs when they become ready, monitors the states of the running jobs, and updates the states of jobs based on the state changes of their depending jobs states. The class provides APIs for suspending/resuming the thread, and for stopping the thread.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	JobControl.ThreadState

构造器概要

构造器

构造器和说明
JobControl(String groupName) Construct a job control for a group of jobs.

方法概要

方法

限定符和类型	方法和说明
String	addJob(ControlledJob aJob) Add a new job.
void	addJobCollection(Collection<ControlledJob> jobs) Add a collection of jobs
boolean	allFinished()
List<ControlledJob>	getFailedJobList()
List<ControlledJob>	getReadyJobsList()
List<ControlledJob>	getRunningJobList()
List<ControlledJob>	getSuccessfulJobList()
JobControl.ThreadState	getThreadState()
List<ControlledJob>	getWaitingJobList()
void	resume() resume the suspended thread
void	run() The main loop for the thread.
void	stop() set the thread state to STOPPING so that the thread will stop when it wakes up.
void	suspend() suspend the running thread

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

JobControl

public JobControl(String groupName)

Construct a job control for a group of jobs.

参数:

groupName - a name identifying this group

方法详细资料

getWaitingJobList

public List<ControlledJob> getWaitingJobList()

返回:

the jobs in the waiting state

getRunningJobList

public List<ControlledJob> getRunningJobList()

返回:

the jobs in the running state

getReadyJobsList

public List<ControlledJob> getReadyJobsList()

返回:

the jobs in the ready state

getSuccessfulJobList

public List<ControlledJob> getSuccessfulJobList()

返回:

the jobs in the success state

getFailedJobList

public List<ControlledJob> getFailedJobList()

addJob

public String addJob(ControlledJob aJob)

Add a new job.

参数:

aJob - the new job

addJobCollection

public void addJobCollection(Collection<ControlledJob> jobs)

Add a collection of jobs

参数:

jobs -

getThreadState

public JobControl.ThreadState getThreadState()

返回:

the thread state

stop

public void stop()

set the thread state to STOPPING so that the thread will stop when it wakes up.

suspend

public void suspend()

suspend the running thread

resume

public void resume()

resume the suspended thread

allFinished

public boolean allFinished()

run

public void run()

The main loop for the thread. The loop does the following: Check the states of the running jobs Update the states of waiting jobs Submit the jobs in ready state

指定者:

run 在接口中 Runnable