Packages

c

org.apache.spark.util

AccumulatorV2

abstract class AccumulatorV2[IN, OUT] extends Serializable

The base class for accumulators, that can accumulate inputs of type IN, and produce output of type OUT.

OUT should be a type that can be read atomically (e.g., Int, Long), or thread-safely (e.g., synchronized collections) because it will be read from other threads.

Source
AccumulatorV2.scala
Linear Supertypes
Serializable, Serializable, AnyRef, Any
Known Subclasses
MapperRowCounter, CollectionAccumulator, DoubleAccumulator, LongAccumulator
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Inherited
  1. AccumulatorV2
  2. Serializable
  3. Serializable
  4. AnyRef
  5. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new AccumulatorV2()

Abstract Value Members

  1. abstract def add(v: IN): Unit

    Takes the inputs and accumulates.

  2. abstract def copy(): AccumulatorV2[IN, OUT]

    Creates a new copy of this accumulator.

  3. abstract def isZero: Boolean

    Returns if this accumulator is zero value or not.

    Returns if this accumulator is zero value or not. e.g. for a counter accumulator, 0 is zero value; for a list accumulator, Nil is zero value.

  4. abstract def merge(other: AccumulatorV2[IN, OUT]): Unit

    Merges another same-type accumulator into this one and update its state, i.e.

    Merges another same-type accumulator into this one and update its state, i.e. this should be merge-in-place.

  5. abstract def reset(): Unit

    Resets this accumulator, which is zero value.

    Resets this accumulator, which is zero value. i.e. call isZero must return true.

  6. abstract def value: OUT

    Defines the current value of this accumulator

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  6. def copyAndReset(): AccumulatorV2[IN, OUT]

    Creates a new copy of this accumulator, which is zero value.

    Creates a new copy of this accumulator, which is zero value. i.e. call isZero on the copy must return true.

  7. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  8. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  9. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  11. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  12. final def id: Long

    Returns the id of this accumulator, can only be called after registration.

  13. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  14. final def isRegistered: Boolean

    Returns true if this accumulator has been registered.

    Returns true if this accumulator has been registered.

    Note

    All accumulators must be registered before use, or it will throw exception.

  15. final def name: Option[String]

    Returns the name of this accumulator, can only be called after registration.

  16. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  17. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  18. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  19. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  20. def toString(): String
    Definition Classes
    AccumulatorV2 → AnyRef → Any
  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( ... ) @native()
  24. def withBufferSerialized(): AccumulatorV2[IN, OUT]
    Attributes
    protected
  25. final def writeReplace(): Any
    Attributes
    protected

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

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