spark

Accumulator

class Accumulator[T] extends Accumulable[T, T]

A simpler value of Accumulable where the result type being accumulated is the same as the types of elements being merged.

T

result type

Linear Supertypes
Accumulable[T, T], Serializable, AnyRef, Any
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  1. Accumulator
  2. Accumulable
  3. Serializable
  4. AnyRef
  5. Any
Visibility
  1. Public
  2. All

Instance Constructors

  1. new Accumulator(initialValue: T, param: AccumulatorParam[T])

    initialValue

    initial value of accumulator

    param

    helper object defining how to add elements of type T

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. def ++=(term: T): Unit

    Merge two accumulable objects together

    Merge two accumulable objects together

    Normally, a user will not want to use this version, but will instead call +=.

    term

    the other Accumulable that will get merged with this

    Definition Classes
    Accumulable

  5. def +=(term: T): Unit

    Add more data to this accumulator / accumulable

    Add more data to this accumulator / accumulable

    term

    the data to add

    Definition Classes
    Accumulable

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

    Definition Classes
    AnyRef

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

    Definition Classes
    Any

  8. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  9. def clone(): AnyRef

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

  10. var deserialized: Boolean

    Definition Classes
    Accumulable

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

    Definition Classes
    AnyRef

  12. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  13. def finalize(): Unit

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

  14. final def getClass(): java.lang.Class[_]

    Definition Classes
    AnyRef → Any

  15. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  16. val id: Long

    Definition Classes
    Accumulable

  17. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  18. def localValue: T

    Get the current value of this accumulator from within a task.

    Get the current value of this accumulator from within a task.

    This is NOT the global value of the accumulator. To get the global value after a completed operation on the dataset, call value.

    The typical use of this method is to directly mutate the local value, eg., to add an element to a Set.

    Definition Classes
    Accumulable

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

    Definition Classes
    AnyRef

  20. final def notify(): Unit

    Definition Classes
    AnyRef

  21. final def notifyAll(): Unit

    Definition Classes
    AnyRef

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

    Definition Classes
    AnyRef

  23. def toString(): String

    Definition Classes
    Accumulable → AnyRef → Any

  24. def value: T

    Access the accumulator's current value; only allowed on master.

    Access the accumulator's current value; only allowed on master.

    Definition Classes
    Accumulable

  25. def value_=(r: T): Unit

    Set the accumulator's value; only allowed on master.

    Set the accumulator's value; only allowed on master.

    Definition Classes
    Accumulable

  26. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

  29. val zero: T

    Definition Classes
    Accumulable

Inherited from Accumulable[T, T]

Inherited from Serializable

Inherited from AnyRef

Inherited from Any