com.twitter.scalding

SkewReplication

sealed abstract class SkewReplication extends AnyRef

Represents a strategy for replicating rows when performing skewed joins.

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SkewReplicationA, SkewReplicationB
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Instance Constructors

  1. new SkewReplication()

Abstract Value Members

  1. abstract def getReplications(leftCount: Int, rightCount: Int, reducers: Int): (Int, Int)

    Given the estimated frequencies of a join key in two pipes that we want to skew-join together, this returns the key's replication amount in each pipe.

    Given the estimated frequencies of a join key in two pipes that we want to skew-join together, this returns the key's replication amount in each pipe.

    Note: if we switch to a Count-Min sketch, we'll need to change the meaning of these counts from "sampled counts" to "estimates of full counts", and also change how we deal with counts of zero.

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  6. val DEFAULT_NUM_REDUCERS: Int

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