Package org.apache.drill.yarn.appMaster

Class AbstractDrillbitScheduler

java.lang.Object

org.apache.drill.yarn.appMaster.AbstractScheduler

org.apache.drill.yarn.appMaster.PersistentTaskScheduler

org.apache.drill.yarn.appMaster.AbstractDrillbitScheduler

All Implemented Interfaces:

Scheduler

Direct Known Subclasses:

DrillbitScheduler

public abstract class AbstractDrillbitScheduler
extends PersistentTaskScheduler

Base class for schedulers (pools) for Drillbits. Derived classes implement various policies for node selection. This class handles the common tasks such as holding the Drillbit launch specification, providing Drillbit- specific behaviors and so on.

The key purpose of this class is to abstract Drillbit-speicific code from the rest of the AM cluster controller. We do so for several reasons: ease of testing (we can use mock tasks), ability to handle additional server types in the future, and a way to keep each module focused on a single task (as the controller and its state machine is complex enough without mixing in Drillbit specifics.)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	AbstractDrillbitScheduler.DrillbitManager	Interface to provide Drill-bit specific behavior.

Nested classes/interfaces inherited from interface org.apache.drill.yarn.appMaster.Scheduler

Scheduler.TaskManager

Field Summary

Fields inherited from class org.apache.drill.yarn.appMaster.PersistentTaskScheduler

quantity

Fields inherited from class org.apache.drill.yarn.appMaster.AbstractScheduler

failCount, isTracked, priority, state, taskManager, taskSpec

Constructor Summary

Constructors

Constructor	Description
AbstractDrillbitScheduler(String type, String name, int quantity)

Method Summary

Methods inherited from class org.apache.drill.yarn.appMaster.PersistentTaskScheduler

adjust, completed, getProgress, getTarget, hasMoreTasks, requestTimedOut, resize

Methods inherited from class org.apache.drill.yarn.appMaster.AbstractScheduler

addTasks, change, getName, getRequestTimeoutSec, getResource, getTaskManager, getType, isTracked, limitContainerSize, registerState, setPriority, setTaskManager

Methods inherited from class java.lang.Object

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

Constructor Details

AbstractDrillbitScheduler

public AbstractDrillbitScheduler(String type,
 String name,
 int quantity)