com.twitter.scalding.reducer_estimation

RuntimeEstimationScheme

trait RuntimeEstimationScheme extends AnyRef

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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MeanEstimationScheme, MedianEstimationScheme
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Abstract Value Members

  1. abstract def estimateJobTime(times: Seq[Double]): Option[Double]

    Given a list of "typical" times observed in a series of jobs of the same FlowStep, aggregates these times into a single estimate of the time that a "typical" reducer took in a "typical" job.

    Given a list of "typical" times observed in a series of jobs of the same FlowStep, aggregates these times into a single estimate of the time that a "typical" reducer took in a "typical" job. Suggested implementation: mean or median.

  2. abstract def estimateTaskTime(times: Seq[Double]): Option[Double]

    Given a list of times that each reducer took in a certain FlowStep, aggregates these times into a single estimate of the time that a "typical" reducer took.

    Given a list of times that each reducer took in a certain FlowStep, aggregates these times into a single estimate of the time that a "typical" reducer took. Suggested implementation: mean or median.

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