HistoryReducerEstimator

Abstract Value Members

abstract def estimateReducers(info: FlowStrategyInfo, history: Seq[FlowStepHistory]): Option[Int]

Attributes
protected
abstract def historyService: HistoryService

Concrete Value Members

final def !=(arg0: Any): Boolean

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final def ##(): Int

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final def ==(arg0: Any): Boolean

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final def asInstanceOf[T0]: T0

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def clone(): AnyRef

Attributes
protected[java.lang]
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@throws( ... )
final def eq(arg0: AnyRef): Boolean

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def equals(arg0: Any): Boolean

Definition Classes
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def estimateReducers(info: FlowStrategyInfo): Option[Int]

Estimate how many reducers should be used.
Estimate how many reducers should be used. Called for each FlowStep before it is scheduled. Custom reducer estimators should override this rather than apply() directly.
info
Holds information about the overall flow (.flow), previously-run steps (.predecessorSteps), and the current step (.step).
returns
Number of reducers recommended by the estimator, or None to keep the default.

Definition Classes
HistoryReducerEstimator → ReducerEstimator
def finalize(): Unit

Attributes
protected[java.lang]
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@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

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def hashCode(): Int

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final def isInstanceOf[T0]: Boolean

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final def ne(arg0: AnyRef): Boolean

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final def notify(): Unit

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final def notifyAll(): Unit

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final def synchronized[T0](arg0: ⇒ T0): T0

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def toString(): String

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final def wait(): Unit

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@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

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@throws( ... )
final def wait(arg0: Long): Unit

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Related Doc: package reducer_estimation

trait HistoryReducerEstimator extends ReducerEstimator

Abstract Value Members

abstract def estimateReducers(info: FlowStrategyInfo, history: Seq[FlowStepHistory]): Option[Int]

abstract def historyService: HistoryService

Concrete Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def estimateReducers(info: FlowStrategyInfo): Option[Int]

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from ReducerEstimator

Inherited from AnyRef

Inherited from Any

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