Trait

com.twitter.scalding.reducer_estimation

ReducerEstimator

Related Doc: package reducer_estimation

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trait ReducerEstimator extends AnyRef

Source
Common.scala
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Known Subclasses
BasicRuntimeReducerEstimator, FallbackEstimator, HistoryReducerEstimator, InputScaledRuntimeReducerEstimator, InputSizeReducerEstimator, RatioBasedEstimator, RuntimeReducerEstimator
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Abstract Value Members

  1. abstract def estimateReducers(info: FlowStrategyInfo): Option[Int]

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    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.

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  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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