com.twitter.scalding

Mappable

trait Mappable[T] extends Source

Usually as soon as we open a source, we read and do some mapping operation on a single column or set of columns. T is the type of the single column. If doing multiple columns T will be a TupleN representing the types, e.g. (Int,Long,String)

Linear Supertypes
Source, Serializable, AnyRef, Any
Known Subclasses
IterableSource, JsonLine, MultipleTextLineFiles, TextLine, TextLineScheme, TypedDelimited
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Type Members

  1. type LocalScheme = Scheme[Properties, InputStream, OutputStream, _, _]

    Definition Classes
    Source

Abstract Value Members

  1. abstract val converter: TupleConverter[T]

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

    Definition Classes
    AnyRef

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

    Definition Classes
    Any

  6. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  7. def castHfsTap(tap: Hfs): Tap[JobConf, RecordReader[_, _], OutputCollector[_, _]]

    Attributes
    protected
    Definition Classes
    Source

  8. def checkFlowDefNotNull(implicit flowDef: FlowDef, mode: Mode): Unit

    Attributes
    protected
    Definition Classes
    Source

  9. def clone(): AnyRef

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

  10. def createTap(readOrWrite: AccessMode)(implicit mode: Mode): Tap[_, _, _]

    Subclasses of Source MUST override this method.

    Subclasses of Source MUST override this method. The base only handles test modes, so you should invoke this method for test modes unless your Source has some special handling of testing.

    Definition Classes
    Source

  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[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()

  14. def flatMapTo[U](out: Fields)(mf: (T) ⇒ Iterable[U])(implicit flowDef: FlowDef, mode: Mode, setter: TupleSetter[U]): Pipe

    If you want to filter, you should use this and output a 0 or 1 length Iterable.

    If you want to filter, you should use this and output a 0 or 1 length Iterable. Filter does not change column names, and we generally expect to change columns here

  15. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any

  16. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  17. def hdfsScheme: Scheme[JobConf, RecordReader[_, _], OutputCollector[_, _], _, _]

    Definition Classes
    Source

  18. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  19. def localScheme: LocalScheme

    Definition Classes
    Source

  20. def mapTo[U](out: Fields)(mf: (T) ⇒ U)(implicit flowDef: FlowDef, mode: Mode, setter: TupleSetter[U]): Pipe

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

    Definition Classes
    AnyRef

  22. final def notify(): Unit

    Definition Classes
    AnyRef

  23. final def notifyAll(): Unit

    Definition Classes
    AnyRef

  24. def read(implicit flowDef: FlowDef, mode: Mode): Pipe

    Definition Classes
    Source

  25. def readAtSubmitter[T](implicit mode: Mode, conv: TupleConverter[T]): Stream[T]

    Allows you to read a Tap on the submit node NOT FOR USE IN THE MAPPERS OR REDUCERS.

    Allows you to read a Tap on the submit node NOT FOR USE IN THE MAPPERS OR REDUCERS. Typical use might be to read in Job.next to determine if another job is needed

    Definition Classes
    Source

  26. def sourceFields: Fields

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

    Definition Classes
    AnyRef

  28. def toString(): String

    Definition Classes
    AnyRef → Any

  29. def transformForRead(pipe: Pipe): Pipe

    Attributes
    protected
    Definition Classes
    Source

  30. def transformForWrite(pipe: Pipe): Pipe

    Attributes
    protected
    Definition Classes
    Source

  31. def validateTaps(mode: Mode): Unit

    Definition Classes
    Source

  32. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

  35. def writeFrom(pipe: Pipe)(implicit flowDef: FlowDef, mode: Mode): Pipe

    write the pipe and return the input so it can be chained into the next operation

    write the pipe and return the input so it can be chained into the next operation

    Definition Classes
    Source

Inherited from Source

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

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