org.apache.hadoop.yarn.api.records

Class ResourceRequest

java.lang.Object

org.apache.hadoop.yarn.api.records.ResourceRequest

All Implemented Interfaces:

Comparable<ResourceRequest>

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class ResourceRequest
extends Object
implements Comparable<ResourceRequest>

ResourceRequest represents the request made by an application to the ResourceManager to obtain various Container allocations.

It includes:

• Priority of the request.
• The name of the machine or rack on which the allocation is desired. A special value of * signifies that any host/rack is acceptable to the application.
• Resource required for each request.
• Number of containers, of above specifications, which are required by the application.
• A boolean relaxLocality flag, defaulting to true, which tells the ResourceManager if the application wants locality to be loose (i.e. allows fall-through to rack or any) or strict (i.e. specify hard constraint on resource allocation).

See Also:

Resource, ApplicationMasterProtocol.allocate(org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ResourceRequest.ResourceRequestComparator

Field Summary

Fields

Modifier and Type	Field and Description
static String	ANY The constant string representing no locality.

Constructor Summary

Constructors

Constructor and Description
ResourceRequest()

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(ResourceRequest other)
boolean	equals(Object obj)
abstract Resource	getCapability() Get the Resource capability of the request.
abstract String	getNodeLabelExpression() Get node-label-expression for this Resource Request.
abstract int	getNumContainers() Get the number of containers required with the given specifications.
abstract Priority	getPriority() Get the Priority of the request.
abstract boolean	getRelaxLocality() Get whether locality relaxation is enabled with this ResourceRequest.
abstract String	getResourceName() Get the resource (e.g.
int	hashCode()
static boolean	isAnyLocation(String hostName) Check whether the given host/rack string represents an arbitrary host name.
static ResourceRequest	newInstance(Priority priority, String hostName, Resource capability, int numContainers)
static ResourceRequest	newInstance(Priority priority, String hostName, Resource capability, int numContainers, boolean relaxLocality)
static ResourceRequest	newInstance(Priority priority, String hostName, Resource capability, int numContainers, boolean relaxLocality, String labelExpression)
abstract void	setCapability(Resource capability) Set the Resource capability of the request
abstract void	setNodeLabelExpression(String nodelabelExpression) Set node label expression of this resource request.
abstract void	setNumContainers(int numContainers) Set the number of containers required with the given specifications
abstract void	setPriority(Priority priority) Set the Priority of the request
abstract void	setRelaxLocality(boolean relaxLocality) For a request at a network hierarchy level, set whether locality can be relaxed to that level and beyond.
abstract void	setResourceName(String resourceName) Set the resource name (e.g.

Methods inherited from class java.lang.Object

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

Field Detail

ANY

public static final String ANY

The constant string representing no locality. It should be used by all references that want to pass an arbitrary host name in.

See Also:

Constant Field Values

Constructor Detail

ResourceRequest

public ResourceRequest()

Method Detail

newInstance

@InterfaceAudience.Public
@InterfaceStability.Stable
public static ResourceRequest newInstance(Priority priority,
                                                                             String hostName,
                                                                             Resource capability,
                                                                             int numContainers)

newInstance

@InterfaceAudience.Public
@InterfaceStability.Stable
public static ResourceRequest newInstance(Priority priority,
                                                                             String hostName,
                                                                             Resource capability,
                                                                             int numContainers,
                                                                             boolean relaxLocality)

newInstance

@InterfaceAudience.Public
@InterfaceStability.Stable
public static ResourceRequest newInstance(Priority priority,
                                                                             String hostName,
                                                                             Resource capability,
                                                                             int numContainers,
                                                                             boolean relaxLocality,
                                                                             String labelExpression)

isAnyLocation

@InterfaceAudience.Public
@InterfaceStability.Stable
public static boolean isAnyLocation(String hostName)

Check whether the given host/rack string represents an arbitrary host name.

Parameters:

hostName - host/rack on which the allocation is desired

Returns:

whether the given host/rack string represents an arbitrary host name

getPriority

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract Priority getPriority()

Get the Priority of the request.

Returns:

Priority of the request

setPriority

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract void setPriority(Priority priority)

Set the Priority of the request

Parameters:

priority - Priority of the request

getResourceName

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract String getResourceName()

Get the resource (e.g. host/rack) on which the allocation is desired. A special value of * signifies that any resource (host/rack) is acceptable.

Returns:

resource (e.g. host/rack) on which the allocation is desired

setResourceName

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract void setResourceName(String resourceName)

Set the resource name (e.g. host/rack) on which the allocation is desired. A special value of * signifies that any resource name (e.g. host/rack) is acceptable.

Parameters:

resourceName - (e.g. host/rack) on which the allocation is desired

getCapability

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract Resource getCapability()

Get the Resource capability of the request.

Returns:

Resource capability of the request

setCapability

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract void setCapability(Resource capability)

Set the Resource capability of the request

Parameters:

capability - Resource capability of the request

getNumContainers

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract int getNumContainers()

Get the number of containers required with the given specifications.

Returns:

number of containers required with the given specifications

setNumContainers

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract void setNumContainers(int numContainers)

Set the number of containers required with the given specifications

Parameters:

numContainers - number of containers required with the given specifications

getRelaxLocality

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract boolean getRelaxLocality()

Get whether locality relaxation is enabled with this ResourceRequest. Defaults to true.

Returns:

whether locality relaxation is enabled with this ResourceRequest.

setRelaxLocality

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract void setRelaxLocality(boolean relaxLocality)

For a request at a network hierarchy level, set whether locality can be relaxed to that level and beyond.

If the flag is off on a rack-level ResourceRequest, containers at that request's priority will not be assigned to nodes on that request's rack unless requests specifically for those nodes have also been submitted.

If the flag is off on an ANY-level ResourceRequest, containers at that request's priority will only be assigned on racks for which specific requests have also been submitted.

For example, to request a container strictly on a specific node, the corresponding rack-level and any-level requests should have locality relaxation set to false. Similarly, to request a container strictly on a specific rack, the corresponding any-level request should have locality relaxation set to false.

Parameters:

relaxLocality - whether locality relaxation is enabled with this ResourceRequest.

getNodeLabelExpression

@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract String getNodeLabelExpression()

Get node-label-expression for this Resource Request. If this is set, all containers allocated to satisfy this resource-request will be only on those nodes that satisfy this node-label-expression. Please note that node label expression now can only take effect when the resource request has resourceName = ANY

Returns:

node-label-expression

setNodeLabelExpression

@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract void setNodeLabelExpression(String nodelabelExpression)

Set node label expression of this resource request. Now only support specifying a single node label. In the future we will support more complex node label expression specification like AND(&&), OR(||), etc. Any please note that node label expression now can only take effect when the resource request has resourceName = ANY

Parameters:

nodelabelExpression - node-label-expression of this ResourceRequest

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

compareTo

public int compareTo(ResourceRequest other)

Specified by:

compareTo in interface Comparable<ResourceRequest>