spark.AccumulableParam

A datatype that can be accumulated, ie. has a commutative & associative +.

You must define how to add data, and how to merge two of these together. For some datatypes, these might be the same operation (eg., a counter). In that case, you might want to use AccumulatorParam. They won't always be the same, though -- eg., imagine you are accumulating a set. You will add items to the set, and you will union two sets together.

R: the full accumulated data
T: partial data that can be added in

Linear Supertypes

Serializable, AnyRef, Any

Known Subclasses

AccumulatorParam, DoubleAccumulatorParam, GrowableAccumulableParam, IntAccumulatorParam, VectorAccumParam

Abstract Value Members

abstract def addAccumulator(t1: R, t2: T): R

Add additional data to the accumulator value.
Add additional data to the accumulator value.
t1
the current value of the accumulator
t2
the data to be added to the accumulator
returns
the new value of the accumulator
abstract def addInPlace(t1: R, t2: R): R

merge two accumulated values together
merge two accumulated values together
t1
one set of accumulated data
t2
another set of accumulated data
returns
both data sets merged together
abstract def zero(initialValue: R): R

Concrete Value Members

final def !=(arg0: AnyRef): Boolean

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

Definition Classes
Any
final def ##(): Int

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

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

Definition Classes
Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def clone(): AnyRef

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

AccumulableParam

trait AccumulableParam[R, T] extends Serializable

Abstract Value Members

abstract def addAccumulator(t1: R, t2: T): R

abstract def addInPlace(t1: R, t2: R): R

abstract def zero(initialValue: R): R

Concrete Value Members

final def !=(arg0: AnyRef): Boolean

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: AnyRef): Boolean

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(): java.lang.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