Package org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies

Class ComputeFairShares

java.lang.Object

org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.ComputeFairShares

public final class ComputeFairShares
extends Object

Contains logic for computing the fair shares. A Schedulable's fair share is Resource it is entitled to, independent of the current demands and allocations on the cluster. A Schedulable whose resource consumption lies at or below its fair share will never have its containers preempted.

Method Summary

Modifier and Type	Method	Description
static void	computeShares(Collection<? extends Schedulable> schedulables, org.apache.hadoop.yarn.api.records.Resource totalResources, String type)	Compute fair share of the given schedulables.Fair share is an allocation of shares considering only active schedulables ie schedulables which have running apps.
static void	computeSteadyShares(Collection<? extends FSQueue> queues, org.apache.hadoop.yarn.api.records.Resource totalResources, String type)	Compute the steady fair share of the given queues.

Methods inherited from class java.lang.Object

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

Method Details

computeShares

public static void computeShares(Collection<? extends Schedulable> schedulables,
 org.apache.hadoop.yarn.api.records.Resource totalResources,
 String type)

Compute fair share of the given schedulables.Fair share is an allocation of shares considering only active schedulables ie schedulables which have running apps.

Parameters:

schedulables - given schedulables.

totalResources - totalResources.

type - type of the resource.

computeSteadyShares

public static void computeSteadyShares(Collection<? extends FSQueue> queues,
 org.apache.hadoop.yarn.api.records.Resource totalResources,
 String type)

Compute the steady fair share of the given queues. The steady fair share is an allocation of shares considering all queues, i.e., active and inactive.

Parameters:

queues - FSQueues whose shares are to be updated.

totalResources - totalResources.

type - type of the resource.