com.twitter.scalding.reducer_estimation

InputSizeReducerEstimator

class InputSizeReducerEstimator extends ReducerEstimator

Estimator that uses the input size and a fixed "bytesPerReducer" target.

Bytes per reducer can be configured with configuration parameter, defaults to 1 GB.

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ReducerEstimator, AnyRef, Any
Known Subclasses
RatioBasedEstimator
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Instance Constructors

  1. new InputSizeReducerEstimator()

Value Members

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

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

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  3. final def ##(): Int

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  4. final def ==(arg0: AnyRef): Boolean

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  8. final def eq(arg0: AnyRef): Boolean

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  9. def equals(arg0: Any): Boolean

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

    Figure out the total size of the input to the current step and set the number of reducers using the "bytesPerReducer" configuration parameter.

    Figure out the total size of the input to the current step and set the number of reducers using the "bytesPerReducer" configuration parameter.

    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
    InputSizeReducerEstimator → ReducerEstimator

  11. def finalize(): Unit

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  12. final def getClass(): Class[_]

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  13. def hashCode(): Int

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  14. def inputSizes(step: FlowStep[JobConf]): Option[Seq[(String, Long)]]

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  15. final def isInstanceOf[T0]: Boolean

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  16. final def ne(arg0: AnyRef): Boolean

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  17. final def notify(): Unit

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  18. final def notifyAll(): Unit

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  19. def size(f: Hfs, conf: JobConf): Long

    Get the total size of the file(s) specified by the Hfs, which may contain a glob pattern in its path, so we must be ready to handle that case.

    Get the total size of the file(s) specified by the Hfs, which may contain a glob pattern in its path, so we must be ready to handle that case.

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

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  21. def toString(): String

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  22. final def wait(): Unit

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

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  24. final def wait(arg0: Long): Unit

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Inherited from ReducerEstimator

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