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()
Source
Aggregator.scala
Linear Supertypes
Serializable, Serializable, Product, Equals, AnyRef, Any
Ordering
  1. Alphabetic
  2. By inheritance
Inherited
  1. Aggregator
  2. Serializable
  3. Serializable
  4. Product
  5. Equals
  6. AnyRef
  7. Any
  1. Hide All
  2. Show all
Learn more about member selection
Visibility
  1. Public
  2. All

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
    AnyRef
    Annotations
    @throws( ... )

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

    Definition Classes
    AnyRef
    Annotations
    @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

Ungrouped