org.apache.hadoop.yarn.api.resource

Class PlacementConstraint.SingleConstraint

java.lang.Object

org.apache.hadoop.yarn.api.resource.PlacementConstraint.AbstractConstraint

org.apache.hadoop.yarn.api.resource.PlacementConstraint.SingleConstraint

All Implemented Interfaces:

PlacementConstraint.Visitable

Enclosing class:

PlacementConstraint

public static class PlacementConstraint.SingleConstraint
extends PlacementConstraint.AbstractConstraint

Consider a set of nodes N that belongs to the scope specified in the constraint. If the target expressions are satisfied at least minCardinality times and at most max-cardinality times in the node set N, then the constraint is satisfied. For example, a constraint of the form {RACK, 2, 10, allocationTag("zk")}, requires an allocation to be placed within a rack that has at least 2 and at most 10 other allocations with tag "zk".

Constructor Summary

Constructors

Constructor and Description
SingleConstraint(String scope, int minC, int maxC, PlacementConstraint.TargetExpression... targetExpressions)
SingleConstraint(String scope, int minCardinality, int maxCardinality, Set<PlacementConstraint.TargetExpression> targetExpressions)

Method Summary

Modifier and Type	Method and Description
<T> T	accept(PlacementConstraint.Visitor<T> visitor) Visitor pattern.
boolean	equals(Object o)
int	getMaxCardinality() Get the maximum cardinality of the constraint.
int	getMinCardinality() Get the minimum cardinality of the constraint.
String	getScope() Get the scope of the constraint.
Set<PlacementConstraint.TargetExpression>	getTargetExpressions() Get the target expressions of the constraint.
int	hashCode()
String	toString()

Methods inherited from class org.apache.hadoop.yarn.api.resource.PlacementConstraint.AbstractConstraint

build

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SingleConstraint

public SingleConstraint(String scope,
                        int minCardinality,
                        int maxCardinality,
                        Set<PlacementConstraint.TargetExpression> targetExpressions)

SingleConstraint

public SingleConstraint(String scope,
                        int minC,
                        int maxC,
                        PlacementConstraint.TargetExpression... targetExpressions)

Method Detail

getScope

public String getScope()

Get the scope of the constraint.

Returns:

the scope of the constraint

getMinCardinality

public int getMinCardinality()

Get the minimum cardinality of the constraint.

Returns:

the minimum cardinality of the constraint

getMaxCardinality

public int getMaxCardinality()

Get the maximum cardinality of the constraint.

Returns:

the maximum cardinality of the constraint

getTargetExpressions

public Set<PlacementConstraint.TargetExpression> getTargetExpressions()

Get the target expressions of the constraint.

Returns:

the set of target expressions

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

accept

public <T> T accept(PlacementConstraint.Visitor<T> visitor)

Description copied from interface: PlacementConstraint.Visitable

Visitor pattern.

Type Parameters:

T - defines the type that the visitor will use and the return type of the accept.

Parameters:

visitor - visitor to be used

Returns:

the result of visiting a given object.