org.apache.hadoop.hive.ql

Class TaskQueue

java.lang.Object

org.apache.hadoop.hive.ql.TaskQueue

public class TaskQueue
extends Object

Handles the queue of tasks that should be executed by the driver.

Constructor Summary

Constructors

Constructor and Description
TaskQueue()
TaskQueue(Context ctx)

Method Summary

Modifier and Type	Method and Description
boolean	addToRunnable(Task<?> tsk)
void	finished(TaskRunner runner)
int	getCurJobNo()
Task<?>	getRunnable(int maxthreads)
void	incCurJobNo(int amount)
static boolean	isLaunchable(Task<?> tsk) Checks if a task can be launched.
boolean	isRunning()
boolean	isShutdown()
void	launching(TaskRunner runner)
TaskRunner	pollFinished() Polls running tasks to see if a task has ended.
void	prepare(QueryPlan plan)
void	releaseRunnable()
void	remove(Task<?> task)
void	shutdown() Cleans up remaining tasks in case of failure.

Methods inherited from class java.lang.Object

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

Constructor Detail

TaskQueue

public TaskQueue()

TaskQueue

public TaskQueue(Context ctx)

Method Detail

isShutdown

public boolean isShutdown()

isRunning

public boolean isRunning()

remove

public void remove(Task<?> task)

launching

public void launching(TaskRunner runner)
               throws HiveException

Throws:

HiveException

getRunnable

public Task<?> getRunnable(int maxthreads)
                    throws HiveException

Throws:

HiveException

releaseRunnable

public void releaseRunnable()

pollFinished

public TaskRunner pollFinished()
                        throws InterruptedException

Polls running tasks to see if a task has ended.

Returns:

The result object for any completed/failed task

Throws:

InterruptedException

shutdown

public void shutdown()

Cleans up remaining tasks in case of failure.

isLaunchable

public static boolean isLaunchable(Task<?> tsk)

Checks if a task can be launched.

Parameters:

tsk - the task to be checked

Returns:

true if the task is launchable, false otherwise

addToRunnable

public boolean addToRunnable(Task<?> tsk)
                      throws HiveException

Throws:

HiveException

getCurJobNo

public int getCurJobNo()

incCurJobNo

public void incCurJobNo(int amount)

prepare

public void prepare(QueryPlan plan)

finished

public void finished(TaskRunner runner)