org.apache.hadoop.yarn.util.resource

Class DefaultResourceCalculator

java.lang.Object

org.apache.hadoop.yarn.util.resource.ResourceCalculator

org.apache.hadoop.yarn.util.resource.DefaultResourceCalculator

@InterfaceAudience.Private
 @InterfaceStability.Unstable
public class DefaultResourceCalculator
extends ResourceCalculator

Constructor Summary

Constructors

Constructor and Description
DefaultResourceCalculator()

Method Summary

Modifier and Type	Method and Description
int	compare(Resource unused, Resource lhs, Resource rhs)
int	computeAvailableContainers(Resource available, Resource required) Compute the number of containers which can be allocated given available and required resources.
float	divide(Resource unused, Resource numerator, Resource denominator) Divide resource numerator by resource denominator using specified policy (domination, average, fairness etc.); hence overall clusterResource is provided for context.
Resource	divideAndCeil(Resource numerator, int denominator) Divide-and-ceil numerator by denominator.
boolean	isInvalidDivisor(Resource r) Determine if a resource is not suitable for use as a divisor (will result in divide by 0, etc)
Resource	multiplyAndNormalizeDown(Resource r, double by, Resource stepFactor) Multiply resource r by factor by and normalize down using step-factor stepFactor.
Resource	multiplyAndNormalizeUp(Resource r, double by, Resource stepFactor) Multiply resource r by factor by and normalize up using step-factor stepFactor.
Resource	normalize(Resource r, Resource minimumResource, Resource maximumResource) Normalize resource r given the base minimumResource and verify against max allowed maximumResource
Resource	normalize(Resource r, Resource minimumResource, Resource maximumResource, Resource stepFactor) Normalize resource r given the base minimumResource and verify against max allowed maximumResource using a step factor for hte normalization.
float	ratio(Resource a, Resource b) Ratio of resource a to resource b.
Resource	roundDown(Resource r, Resource stepFactor) Round-down resource r given factor stepFactor.
Resource	roundUp(Resource r, Resource stepFactor) Round-up resource r given factor stepFactor.

Methods inherited from class org.apache.hadoop.yarn.util.resource.ResourceCalculator

divideAndCeil, roundDown, roundUp

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultResourceCalculator

public DefaultResourceCalculator()

Method Detail

compare

public int compare(Resource unused,
                   Resource lhs,
                   Resource rhs)

Specified by:

compare in class ResourceCalculator

computeAvailableContainers

public int computeAvailableContainers(Resource available,
                                      Resource required)

Description copied from class: ResourceCalculator

Compute the number of containers which can be allocated given available and required resources.

Specified by:

computeAvailableContainers in class ResourceCalculator

Parameters:

available - available resources

required - required resources

Returns:

number of containers which can be allocated

divide

public float divide(Resource unused,
                    Resource numerator,
                    Resource denominator)

Description copied from class: ResourceCalculator

Divide resource numerator by resource denominator using specified policy (domination, average, fairness etc.); hence overall clusterResource is provided for context.

Specified by:

divide in class ResourceCalculator

Parameters:

unused - cluster resources

numerator - numerator

denominator - denominator

Returns:

numerator/denominator using specific policy

isInvalidDivisor

public boolean isInvalidDivisor(Resource r)

Description copied from class: ResourceCalculator

Determine if a resource is not suitable for use as a divisor (will result in divide by 0, etc)

Specified by:

isInvalidDivisor in class ResourceCalculator

Parameters:

r - resource

Returns:

true if divisor is invalid (should not be used), false else

ratio

public float ratio(Resource a,
                   Resource b)

Description copied from class: ResourceCalculator

Ratio of resource a to resource b.

Specified by:

ratio in class ResourceCalculator

Parameters:

a - resource

b - resource

Returns:

ratio of resource a to resource b

divideAndCeil

public Resource divideAndCeil(Resource numerator,
                              int denominator)

Description copied from class: ResourceCalculator

Divide-and-ceil numerator by denominator.

Specified by:

divideAndCeil in class ResourceCalculator

Parameters:

numerator - numerator resource

denominator - denominator

Returns:

resultant resource

normalize

public Resource normalize(Resource r,
                          Resource minimumResource,
                          Resource maximumResource,
                          Resource stepFactor)

Description copied from class: ResourceCalculator

Normalize resource r given the base minimumResource and verify against max allowed maximumResource using a step factor for hte normalization.

Specified by:

normalize in class ResourceCalculator

Parameters:

r - resource

minimumResource - minimum value

maximumResource - the upper bound of the resource to be allocated

stepFactor - the increment for resources to be allocated

Returns:

normalized resource

normalize

public Resource normalize(Resource r,
                          Resource minimumResource,
                          Resource maximumResource)

Description copied from class: ResourceCalculator

Normalize resource r given the base minimumResource and verify against max allowed maximumResource

Overrides:

normalize in class ResourceCalculator

Parameters:

r - resource

minimumResource - step-factor

maximumResource - the upper bound of the resource to be allocated

Returns:

normalized resource

roundUp

public Resource roundUp(Resource r,
                        Resource stepFactor)

Description copied from class: ResourceCalculator

Round-up resource r given factor stepFactor.

Specified by:

roundUp in class ResourceCalculator

Parameters:

r - resource

stepFactor - step-factor

Returns:

rounded resource

roundDown

public Resource roundDown(Resource r,
                          Resource stepFactor)

Description copied from class: ResourceCalculator

Round-down resource r given factor stepFactor.

Specified by:

roundDown in class ResourceCalculator

Parameters:

r - resource

stepFactor - step-factor

Returns:

rounded resource

multiplyAndNormalizeUp

public Resource multiplyAndNormalizeUp(Resource r,
                                       double by,
                                       Resource stepFactor)

Description copied from class: ResourceCalculator

Multiply resource r by factor by and normalize up using step-factor stepFactor.

Specified by:

multiplyAndNormalizeUp in class ResourceCalculator

Parameters:

r - resource to be multiplied

by - multiplier

stepFactor - factor by which to normalize up

Returns:

resulting normalized resource

multiplyAndNormalizeDown

public Resource multiplyAndNormalizeDown(Resource r,
                                         double by,
                                         Resource stepFactor)

Description copied from class: ResourceCalculator

Multiply resource r by factor by and normalize down using step-factor stepFactor.

Specified by:

multiplyAndNormalizeDown in class ResourceCalculator

Parameters:

r - resource to be multiplied

by - multiplier

stepFactor - factor by which to normalize down

Returns:

resulting normalized resource