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org.checkita.dqf.core.metrics.rdd.regular

AlgebirdRDDMetrics

object AlgebirdRDDMetrics

Metrics based on using the Algebird library (abstract algebra for Scala) https://github.com/twitter/algebird

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  1. case class HLLSequenceCompletenessRDDMetricCalculator(hLL: HLL, bitsNumber: Int, minVal: Long, maxVal: Long, accuracyError: Double, increment: Long, failCount: Long = 0, status: CalculatorStatus = CalculatorStatus.Success, failMsg: String = "OK") extends RDDMetricCalculator with Product with Serializable

    Calculates approximate completeness of incremental integer (long) sequence, i.e.

    Calculates approximate completeness of incremental integer (long) sequence, i.e. checks if sequence does not have missing elements. Check is performed using variance algorithm HyperLogLog. Works for single column only!

    hLL

    Initial HyperLogLog monoid

    bitsNumber

    Size of HLL (calculates automatically for a specific accuracy error)

    minVal

    Minimum observed value in a sequence

    maxVal

    Maximum observed value in a sequence

    accuracyError

    Error of calculation

    increment

    Sequence increment

    returns

    result map with keys: "APPROXIMATE_SEQUENCE_COMPLETENESS"

  2. case class HyperLogLogRDDMetricCalculator(hLL: HLL, bitsNumber: Int, accuracyError: Double, failCount: Long = 0, status: CalculatorStatus = CalculatorStatus.Success, failMsg: String = "OK") extends RDDMetricCalculator with Product with Serializable

    Calculates number of distinct values in processed elements

    Calculates number of distinct values in processed elements

    Works for single column only!

    hLL

    Initial HyperLogLog monoid

    bitsNumber

    Size of HLL (calculates automatically for a specific accuracy error)

    accuracyError

    Error of calculation.

    returns

    result map with keys: "APPROXIMATE_DISTINCT_VALUES"

  3. case class TopKRDDMetricCalculator(list: SpaceSaver[String], maxCapacity: Int, targetNumber: Int, rowCount: Int, failCount: Long = 0, status: CalculatorStatus = CalculatorStatus.Success, failMsg: String = "OK") extends RDDMetricCalculator with Product with Serializable

    Calculates top N elements out of processed elements

    Calculates top N elements out of processed elements

    Works for single column only!

    list

    Initial SpaceSaver monoid

    maxCapacity

    Maximal size of SpaceSaver

    targetNumber

    Required N

    returns

    result map with keys: "TOP_N_{index}"

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