gio

Documentation

Index

• func Emit(anyObject ...interface{}) error
• func Init()
• func ProcessMapper(f Mapper) (err error)
• func ProcessReducer(f Reducer, keyPositions []int) (err error)
• type Mapper
• type MapperId
  • func RegisterMapper(fn Mapper) MapperId
• type Reducer
• type ReducerId
  • func RegisterReducer(fn Reducer) ReducerId

Functions

func Emit

func Emit(anyObject ...interface{}) error

Emit encode and write a row of data to os.Stdout

func Init

func Init()

Init determines whether the driver program will execute the mapper/reducer or not. If the command line invokes the mapper or reducer, execute it and exit. This function will invoke flag.Parse() first.

func ProcessMapper

func ProcessMapper(f Mapper) (err error)

func ProcessReducer

func ProcessReducer(f Reducer, keyPositions []int) (err error)

Types

type Mapper

type Mapper func([]interface{}) error

type MapperId

type MapperId string

func RegisterMapper

func RegisterMapper(fn Mapper) MapperId

RegisterMapper register a mapper function to process a command

type Reducer

type Reducer func(x, y interface{}) (interface{}, error)

type ReducerId

type ReducerId string

func RegisterReducer

func RegisterReducer(fn Reducer) ReducerId