Package org.apache.storm.scheduler.resource.strategies.scheduling

Class ConstraintSolverConfig

java.lang.Object

org.apache.storm.scheduler.resource.strategies.scheduling.ConstraintSolverConfig

public final class ConstraintSolverConfig
extends Object

Component constraint as derived from configuration. This is backward compatible and can parse old style Config.TOPOLOGY_RAS_CONSTRAINTS and Config.TOPOLOGY_SPREAD_COMPONENTS. New style Config.TOPOLOGY_RAS_CONSTRAINTS is map where each component has a list of other incompatible components and an optional number that specifies the maximum co-location count for the component on a node.

comp-1 cannot exist on same worker as comp-2 or comp-3, and at most "2" comp-1 on same node

comp-2 and comp-4 cannot be on same worker (missing comp-1 is implied from comp-1 constraint)

{ "comp-1": { "maxNodeCoLocationCnt": 2, "incompatibleComponents": ["comp-2", "comp-3" ] }, "comp-2": { "incompatibleComponents": [ "comp-4" ] } }

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CONSTRAINT_TYPE_INCOMPATIBLE_COMPONENTS
static final String	CONSTRAINT_TYPE_MAX_NODE_CO_LOCATION_CNT

Constructor Summary

Constructors

Constructor	Description
ConstraintSolverConfig(String topoId, Map<String,Object> topoConf, Set<String> comps)
ConstraintSolverConfig(TopologyDetails topo)

Method Summary

Modifier and Type	Method	Description
Map<String,Set<String>>	getIncompatibleComponentSets()	Return an object that maps component names to a set of other components which are incompatible and their executor instances cannot co-exist on the same worker.
Map<String,Integer>	getMaxNodeCoLocationCnts()	Return an object that maps component names to a numeric maximum limit of executor instances (of that component) that can exist on any node.

Methods inherited from class java.lang.Object

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

Field Details

CONSTRAINT_TYPE_MAX_NODE_CO_LOCATION_CNT

public static final String CONSTRAINT_TYPE_MAX_NODE_CO_LOCATION_CNT

See Also:

• Constant Field Values

CONSTRAINT_TYPE_INCOMPATIBLE_COMPONENTS

public static final String CONSTRAINT_TYPE_INCOMPATIBLE_COMPONENTS

See Also:

• Constant Field Values

Constructor Details

ConstraintSolverConfig

public ConstraintSolverConfig(TopologyDetails topo)

ConstraintSolverConfig

public ConstraintSolverConfig(String topoId,
 Map<String,Object> topoConf,
 Set<String> comps)

Method Details

getIncompatibleComponentSets

public Map<String,Set<String>> getIncompatibleComponentSets()

Return an object that maps component names to a set of other components which are incompatible and their executor instances cannot co-exist on the same worker. The map will contain entries only for components that have this CONSTRAINT_TYPE_INCOMPATIBLE_COMPONENTS constraint specified.

Returns:

a map of component to a set of components that cannot co-exist on the same worker.

getMaxNodeCoLocationCnts

public Map<String,Integer> getMaxNodeCoLocationCnts()

Return an object that maps component names to a numeric maximum limit of executor instances (of that component) that can exist on any node. The map will contain entries only for components that have this CONSTRAINT_TYPE_MAX_NODE_CO_LOCATION_CNT constraint specified.

Returns:

a map of component to its maximum limit of executor instances on a node.