org.apache.hadoop.hbase.mapreduce

类 TableReducer<KEYIN,VALUEIN,KEYOUT>

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<KEYIN,VALUEIN,KEYOUT,Mutation>

org.apache.hadoop.hbase.mapreduce.TableReducer<KEYIN,VALUEIN,KEYOUT>

类型参数:

KEYIN - The type of the input key.

VALUEIN - The type of the input value.

KEYOUT - The type of the output key.

直接已知子类:

IdentityTableReducer

@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class TableReducer<KEYIN,VALUEIN,KEYOUT>
extends org.apache.hadoop.mapreduce.Reducer<KEYIN,VALUEIN,KEYOUT,Mutation>

Extends the basic Reducer class to add the required key and value input/output classes. While the input key and value as well as the output key can be anything handed in from the previous map phase the output value must be either a Put or a Delete instance when using the TableOutputFormat class.

This class is extended by IdentityTableReducer but can also be subclassed to implement similar features or any custom code needed. It has the advantage to enforce the output value to a specific basic type.

另请参阅:

Reducer

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.mapreduce.Reducer

org.apache.hadoop.mapreduce.Reducer.Context

构造器概要

构造器

构造器和说明
TableReducer()

方法概要

从类继承的方法 org.apache.hadoop.mapreduce.Reducer

cleanup, reduce, run, setup

从类继承的方法 java.lang.Object

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

构造器详细资料

TableReducer

public TableReducer()