Package org.apache.hadoop.yarn.server.resourcemanager.placement.csmappingrule

Class MappingRule

java.lang.Object

org.apache.hadoop.yarn.server.resourcemanager.placement.csmappingrule.MappingRule

public class MappingRule
extends Object

Mapping rule represents a single mapping setting defined by the user. All rules have matchers and actions. Matcher determine if a mapping rule applies to a given applicationSubmission, while action represent the course of action we need to take when a rule applies. MappingRules also support fallback actions, which will be evaluated when the main action fails due to any reason (Eg. trying to place to a queue which does not exist)

Field Summary

Fields

Modifier and Type	Field	Description
static final String	APPLICATION_MAPPING
static final String	GROUP_MAPPING
static final String	USER_MAPPING

Constructor Summary

Constructors

Constructor	Description
MappingRule(MappingRuleMatcher matcher, MappingRuleAction action)

Method Summary

Modifier and Type	Method	Description
static MappingRule	createLegacyRule(String source, String path)	Creates a MappingRule object from the legacy style configuration.
static MappingRule	createLegacyRule(String type, String source, String path)	Creates a MappingRule object from the legacy style configuration.
MappingRuleResult	evaluate(VariableContext variables)	This method evaluates the rule, and returns the MappingRuleResult, if the rule matches, skip action otherwise.
MappingRuleResult	getFallback()	Returns the associated action's fallback.
String	toString()
void	validate(MappingRuleValidationContext ctx)

Methods inherited from class java.lang.Object

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

Field Details

USER_MAPPING

public static final String USER_MAPPING

See Also:

• Constant Field Values

GROUP_MAPPING

public static final String GROUP_MAPPING

See Also:

• Constant Field Values

APPLICATION_MAPPING

public static final String APPLICATION_MAPPING

See Also:

• Constant Field Values

Constructor Details

MappingRule

public MappingRule(MappingRuleMatcher matcher,
 MappingRuleAction action)

Method Details

evaluate

public MappingRuleResult evaluate(VariableContext variables)

This method evaluates the rule, and returns the MappingRuleResult, if the rule matches, skip action otherwise.

Parameters:

variables - The variable context, which contains all the variables

Returns:

The rule's result or skip action if the rule doesn't apply

getFallback

public MappingRuleResult getFallback()

Returns the associated action's fallback.

Returns:

The fallback of the action

createLegacyRule

public static MappingRule createLegacyRule(String source,
 String path)

Creates a MappingRule object from the legacy style configuration. The configuration is a [TYPE]:SOURCE:PATH (eg. u:bob:root.users.%user). Using the source and path parts of the legacy rule, this method will create an application MappingRule which behaves as the legacy rule defined. This version of the method does not require type, since legacy application mappings omitted the 'a', so this method is to be used for those rules, which in all case are application mappings.

Parameters:

source - This part of the rule determines which applications the rule will be applied

path - The path where the application is to be placed

Returns:

MappingRule based on the provided settings

createLegacyRule

public static MappingRule createLegacyRule(String type,
 String source,
 String path)

Creates a MappingRule object from the legacy style configuration. The configuration is a [TYPE]:SOURCE:PATH (eg. u:bob:root.users.%user). Using the type, source and path parts of the legacy rule, this method will create a MappingRule which behaves as the legacy rule defined.

Parameters:

type - The type of the rule, can be 'u' for user mapping, 'g' for group mapping or 'a' for application mapping

source - This part of the rule determines which submissions this rule should apply to (eg. if type is 'u', source will match against the user name)

path - The path where the application is to be placed

Returns:

MappingRule based on the provided settings

validate

public void validate(MappingRuleValidationContext ctx)
              throws org.apache.hadoop.yarn.exceptions.YarnException

Throws:

org.apache.hadoop.yarn.exceptions.YarnException

toString

public String toString()

Overrides:

toString in class Object