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 Details

    • CONSTRAINT_TYPE_MAX_NODE_CO_LOCATION_CNT

      public static final String CONSTRAINT_TYPE_MAX_NODE_CO_LOCATION_CNT
      See Also:
    • CONSTRAINT_TYPE_INCOMPATIBLE_COMPONENTS

      public static final String CONSTRAINT_TYPE_INCOMPATIBLE_COMPONENTS
      See Also:
  • Constructor Details

  • 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.