Class

org.apache.spark

Aggregator

Related Doc: package spark

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case class Aggregator[K, V, C](createCombiner: (V) ⇒ C, mergeValue: (C, V) ⇒ C, mergeCombiners: (C, C) ⇒ C) extends Product with Serializable

:: DeveloperApi :: A set of functions used to aggregate data.

createCombiner

function to create the initial value of the aggregation.

mergeValue

function to merge a new value into the aggregation result.

mergeCombiners

function to merge outputs from multiple mergeValue function.

Annotations
@DeveloperApi()
Source
Aggregator.scala
Linear Supertypes
Serializable, Serializable, Product, Equals, AnyRef, Any
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Instance Constructors

  1. new Aggregator(createCombiner: (V) ⇒ C, mergeValue: (C, V) ⇒ C, mergeCombiners: (C, C) ⇒ C)

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    createCombiner

    function to create the initial value of the aggregation.

    mergeValue

    function to merge a new value into the aggregation result.

    mergeCombiners

    function to merge outputs from multiple mergeValue function.

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]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  6. def combineCombinersByKey(iter: Iterator[_ <: Product2[K, C]], context: TaskContext): Iterator[(K, C)]

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  7. def combineValuesByKey(iter: Iterator[_ <: Product2[K, V]], context: TaskContext): Iterator[(K, C)]

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  8. val createCombiner: (V) ⇒ C

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    function to create the initial value of the aggregation.

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

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    Definition Classes
    AnyRef

  10. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )

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

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    AnyRef → Any

  12. final def isInstanceOf[T0]: Boolean

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    Any

  13. val mergeCombiners: (C, C) ⇒ C

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    function to merge outputs from multiple mergeValue function.

  14. val mergeValue: (C, V) ⇒ C

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    function to merge a new value into the aggregation result.

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

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    AnyRef

  16. final def notify(): Unit

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    AnyRef

  17. final def notifyAll(): Unit

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    AnyRef

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

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  19. final def wait(): Unit

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    @throws( ... )

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

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    @throws( ... )

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

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    @throws( ... )

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

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