com.google.appengine.tools.mapreduce

Interface MapperContext<K,V>

Type Parameters:

K - type of keys produced by the mapper

V - type of values produced by the mapper

All Superinterfaces:

Context, ShardContext, WorkerContext<KeyValue<K,V>>

public interface MapperContext<K,V>
extends WorkerContext<KeyValue<K,V>>

A context for mapper execution. Provides everything that might be needed by a mapper function.

Method Summary

Methods

Modifier and Type	Method and Description
void	emit(K key, V value) Emits a key and a value to the output.

Methods inherited from interface com.google.appengine.tools.mapreduce.WorkerContext

emit

Methods inherited from interface com.google.appengine.tools.mapreduce.ShardContext

getCounter, getCounters, getShardCount, getShardNumber, incrementCounter, incrementCounter

Methods inherited from interface com.google.appengine.tools.mapreduce.Context

getJobId

Method Detail

emit

void emit(K key,
        V value)

Emits a key and a value to the output.