StreamOperations

Abstract Value Members

abstract def mapStream[T, X](fieldDef: (Fields, Fields))(mapfn: (Iterator[T]) ⇒ TraversableOnce[X])(implicit conv: TupleConverter[T], setter: TupleSetter[X]): Self

Corresponds to a Cascading Buffer which allows you to stream through the data, keeping some, dropping, scanning, etc...
Corresponds to a Cascading Buffer which allows you to stream through the data, keeping some, dropping, scanning, etc... The iterator you are passed is lazy, and mapping will not trigger the entire evaluation. If you convert to a list (i.e. to reverse), you need to be aware that memory constraints may become an issue.
WARNING: Any fields not referenced by the input fields will be aligned to the first output, and the final hadoop stream will have a length of the maximum of the output of this, and the input stream. So, if you change the length of your inputs, the other fields won't be aligned. YOU NEED TO INCLUDE ALL THE FIELDS YOU WANT TO KEEP ALIGNED IN THIS MAPPING! POB: This appears to be a Cascading design decision.
WARNING: mapfn needs to be stateless. Multiple calls needs to be safe (no mutable state captured)
abstract def sortBy(innerSort: Fields): Self

Definition Classes
Sortable
abstract def sorting: Option[Fields]

Definition Classes
Sortable

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( ... )
def drop(cnt: Int): Self

Remove the first cnt elements
def dropWhile[T](f: Fields)(fn: (T) ⇒ Boolean)(implicit conv: TupleConverter[T]): Self

Drop while the predicate is true, starting at the first false, output all
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
def scanLeft[X, T](fieldDef: (Fields, Fields))(init: X)(fn: (X, T) ⇒ X)(implicit setter: TupleSetter[X], conv: TupleConverter[T]): Self
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def take(cnt: Int): Self

Only keep the first cnt elements
def takeWhile[T](f: Fields)(fn: (T) ⇒ Boolean)(implicit conv: TupleConverter[T]): Self

Take while the predicate is true, stopping at the first false.
Take while the predicate is true, stopping at the first false. Output all taken elements.
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 scalding

trait StreamOperations[+Self <: StreamOperations[Self]] extends Sortable[Self] with Serializable

Abstract Value Members

abstract def mapStream[T, X](fieldDef: (Fields, Fields))(mapfn: (Iterator[T]) ⇒ TraversableOnce[X])(implicit conv: TupleConverter[T], setter: TupleSetter[X]): Self

abstract def sortBy(innerSort: Fields): Self

abstract def sorting: Option[Fields]

Concrete Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

def drop(cnt: Int): Self

def dropWhile[T](f: Fields)(fn: (T) ⇒ Boolean)(implicit conv: TupleConverter[T]): Self

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

def scanLeft[X, T](fieldDef: (Fields, Fields))(init: X)(fn: (X, T) ⇒ X)(implicit setter: TupleSetter[X], conv: TupleConverter[T]): Self

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

def take(cnt: Int): Self

def takeWhile[T](f: Fields)(fn: (T) ⇒ Boolean)(implicit conv: TupleConverter[T]): Self

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 Sortable[Self]

Inherited from AnyRef

Inherited from Any

Ungrouped