org.apache.hadoop.yarn.server.resourcemanager.reservation
Class NoOverCommitPolicy

java.lang.Object
  org.apache.hadoop.yarn.server.resourcemanager.reservation.NoOverCommitPolicy

All Implemented Interfaces:

SharingPolicy

@InterfaceAudience.LimitedPrivate(value="yarn")
@InterfaceStability.Unstable
public class NoOverCommitPolicy
extends Object
implements SharingPolicy

This policy enforce a simple physical cluster capacity constraints, by validating that the allocation proposed fits in the current plan. This validation is compatible with "updates" and in verifying the capacity constraints it conceptually remove the prior version of the reservation.

Constructor Summary

NoOverCommitPolicy()

Method Summary

long	getValidWindow() Returns the time range before and after the current reservation considered by this policy.
void	init(String planQueuePath, org.apache.hadoop.conf.Configuration conf) Initialize this policy
void	validate(Plan plan, ReservationAllocation reservation) This method runs the policy validation logic, and return true/false on whether the ReservationAllocation is acceptable according to this sharing policy.

Methods inherited from class java.lang.Object

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

Constructor Detail

NoOverCommitPolicy

public NoOverCommitPolicy()

Method Detail

validate

public void validate(Plan plan,
                     ReservationAllocation reservation)
              throws PlanningException

Description copied from interface: SharingPolicy

This method runs the policy validation logic, and return true/false on whether the ReservationAllocation is acceptable according to this sharing policy.

Specified by:

validate in interface SharingPolicy

Parameters:

plan - the Plan we validate against

reservation - the allocation proposed to be added to the Plan

Throws:

PlanningException - if the policy is respected if we add this ReservationAllocation to the Plan

getValidWindow

public long getValidWindow()

Description copied from interface: SharingPolicy

Returns the time range before and after the current reservation considered by this policy. In particular, this informs the archival process for the Plan, i.e., reservations regarding times before (now - validWindow) can be deleted.

Specified by:

getValidWindow in interface SharingPolicy

Returns:

validWindow the window of validity considered by the policy.

init

public void init(String planQueuePath,
                 org.apache.hadoop.conf.Configuration conf)

Description copied from interface: SharingPolicy

Initialize this policy

Specified by:

init in interface SharingPolicy

Parameters:

planQueuePath - the name of the queue for this plan

conf - the system configuration