Class

com.twitter.algebird

TopNLogic

Related Doc: package algebird

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case class TopNLogic[K](heavyHittersN: Int) extends HeavyHittersLogic[K] with Product with Serializable

Tracks the top N heavy hitters, where N is defined by heavyHittersN.

Warning: top-N computations are not associative. The effect is that a top-N CMS has an ordering bias (with regard to heavy hitters) when merging instances. This means merging heavy hitters across CMS instances may lead to incorrect, biased results: the outcome is biased by the order in which CMS instances / heavy hitters are being merged, with the rule of thumb being that the earlier a set of heavy hitters is being merged, the more likely is the end result biased towards these heavy hitters.

Source
CountMinSketch.scala
See also

Discussion in Algebird issue 353

Linear Supertypes
Serializable, Product, Equals, HeavyHittersLogic[K], Serializable, AnyRef, Any
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Instance Constructors

  1. new TopNLogic(heavyHittersN: Int)

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Value Members

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

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

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    AnyRef → Any
  4. final def asInstanceOf[T0]: T0

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    Any
  5. def clone(): AnyRef

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    Attributes
    protected[java.lang]
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    AnyRef
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    @throws( ... )
  6. final def eq(arg0: AnyRef): Boolean

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    AnyRef
  7. def finalize(): Unit

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    Attributes
    protected[java.lang]
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    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  8. final def getClass(): Class[_]

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    AnyRef → Any
  9. val heavyHittersN: Int

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  10. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  11. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  12. final def notify(): Unit

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    Definition Classes
    AnyRef
  13. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  14. def purgeHeavyHitters(cms: CMS[K])(hitters: HeavyHitters[K]): HeavyHitters[K]

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    Definition Classes
    TopNLogicHeavyHittersLogic
  15. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  16. def updateHeavyHitters(cms: CMS[K])(left: HeavyHitters[K], right: HeavyHitters[K]): HeavyHitters[K]

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    Definition Classes
    HeavyHittersLogic
  17. def updateHeavyHitters(oldCms: CMS[K], newCms: CMS[K])(hhs: HeavyHitters[K], item: K, count: Long): HeavyHitters[K]

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    Definition Classes
    HeavyHittersLogic
  18. final def wait(): Unit

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    AnyRef
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    @throws( ... )
  19. final def wait(arg0: Long, arg1: Int): Unit

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    @throws( ... )
  20. final def wait(arg0: Long): Unit

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Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from HeavyHittersLogic[K]

Inherited from Serializable

Inherited from AnyRef

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