AccumulableParam

Helper object defining how to accumulate values of a particular type. An implicit AccumulableParam needs to be available when you create Accumulables of a specific type.

R: the full accumulated data (result type)
T: partial data that can be added in

Annotations: @deprecated
Deprecated: (Since version 2.0.0) use AccumulatorV2
Source: Accumulable.scala

Linear Supertypes

Serializable, AnyRef, Any

Known Subclasses

AccumulatorParam, DoubleAccumulatorParam, FloatAccumulatorParam, IntAccumulatorParam, LongAccumulatorParam

Abstract Value Members

abstract def addAccumulator(r: R, t: T): R

Add additional data to the accumulator value.
Add additional data to the accumulator value. Is allowed to modify and return r for efficiency (to avoid allocating objects).
r
the current value of the accumulator
t
the data to be added to the accumulator
returns
the new value of the accumulator
abstract def addInPlace(r1: R, r2: R): R

Merge two accumulated values together.
Merge two accumulated values together. Is allowed to modify and return the first value for efficiency (to avoid allocating objects).
r1
one set of accumulated data
r2
another set of accumulated data
returns
both data sets merged together
abstract def zero(initialValue: R): R

Return the "zero" (identity) value for an accumulator type, given its initial value.
Return the "zero" (identity) value for an accumulator type, given its initial value. For example, if R was a vector of N dimensions, this would return a vector of N zeroes.

Concrete Value Members

final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def ##(): Int

Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String

Definition Classes
AnyRef → Any
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )

Related Doc: package spark

trait AccumulableParam[R, T] extends Serializable

Abstract Value Members

abstract def addAccumulator(r: R, t: T): R

abstract def addInPlace(r1: R, r2: R): R

abstract def zero(initialValue: R): R

Concrete Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

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

def toString(): String

final def wait(): Unit

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

final def wait(arg0: Long): Unit

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped