com.google.appengine.tools.mapreduce.reducers

Class NoReducer<K,V,O>

java.lang.Object

com.google.appengine.tools.mapreduce.Worker<ReducerContext<O>>

com.google.appengine.tools.mapreduce.Reducer<K,V,O>

com.google.appengine.tools.mapreduce.reducers.NoReducer<K,V,O>

Type Parameters:

K - type of keys formally (but not actually) accepted by this reducer

V - type of values formally (but not actually) accepted by this reducer

O - type of output formally (but not actually) emitted by this reducer\

All Implemented Interfaces:

Serializable

Deprecated.

Consider using MapJob instead.

@Deprecated
public class NoReducer<K,V,O>
extends Reducer<K,V,O>

A reducer that throws an exception if it receives any keys or values, and never emits any values.

Author:

ohler@google.com (Christian Ohler)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
NoReducer() Deprecated.

Method Summary

Methods

Modifier and Type	Method and Description
static <K,V,O> NoReducer<K,V,O>	create() Deprecated.
void	reduce(K key, ReducerInput<V> values) Deprecated. Processes the values for a given key, using the context returned by Worker.getContext() to emit output to the Output of the MapReduce.

Methods inherited from class com.google.appengine.tools.mapreduce.Reducer

emit

Methods inherited from class com.google.appengine.tools.mapreduce.Worker

allowSliceRetry, beginShard, beginSlice, endShard, endSlice, estimateMemoryRequirement, getContext, setContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NoReducer

public NoReducer()

Deprecated.

Method Detail

create

public static <K,V,O> NoReducer<K,V,O> create()

Deprecated.

reduce

public void reduce(K key,
          ReducerInput<V> values)

Deprecated.

Description copied from class: Reducer

Processes the values for a given key, using the context returned by Worker.getContext() to emit output to the Output of the MapReduce. values enumerates all values that the map phase produced for the key key. It will always contain at least one value.

Specified by:

reduce in class Reducer<K,V,O>