org.apache.spark

Aggregator

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()
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)

    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: AnyRef): Boolean

    Definition Classes
    AnyRef

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

    Definition Classes
    Any

  3. final def ##(): Int

    Definition Classes
    AnyRef → Any

  4. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  5. final def ==(arg0: Any): Boolean

    Definition Classes
    Any

  6. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  7. def clone(): AnyRef

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

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

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

  10. val createCombiner: (V) ⇒ C

    function to create the initial value of the aggregation.

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

    Definition Classes
    AnyRef

  12. def finalize(): Unit

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

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

    Definition Classes
    AnyRef → Any

  14. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  15. val mergeCombiners: (C, C) ⇒ C

    function to merge outputs from multiple mergeValue function.

  16. val mergeValue: (C, V) ⇒ C

    function to merge a new value into the aggregation result.

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

    Definition Classes
    AnyRef

  18. final def notify(): Unit

    Definition Classes
    AnyRef

  19. final def notifyAll(): Unit

    Definition Classes
    AnyRef

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

    Definition Classes
    AnyRef

  21. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

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

    Definition Classes
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    @throws( ... )

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

    Definition Classes
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    @throws( ... )

Deprecated Value Members

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

    Annotations
    @deprecated
    Deprecated

    (Since version 0.9.0) use combineCombinersByKey with TaskContext argument

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

    Annotations
    @deprecated
    Deprecated

    (Since version 0.9.0) use combineValuesByKey with TaskContext argument

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

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