org.apache.hadoop.hbase.mapreduce

类 PutSortReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>

org.apache.hadoop.hbase.mapreduce.PutSortReducer

@InterfaceAudience.Public
@InterfaceStability.Stable
public class PutSortReducer
extends org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>

Emits sorted Puts. Reads in all Puts from passed Iterator, sorts them, then emits Puts in sorted order. If lots of columns per row, it will use lots of memory sorting.

另请参阅:

HFileOutputFormat, KeyValueSortReducer

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
PutSortReducer()

方法概要

方法

限定符和类型	方法和说明
protected void	reduce(ImmutableBytesWritable row, Iterable<Put> puts, org.apache.hadoop.mapreduce.Reducer.Context context)
protected void	setup(org.apache.hadoop.mapreduce.Reducer.Context context)

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

cleanup, run

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

PutSortReducer

public PutSortReducer()

方法详细资料

setup

protected void setup(org.apache.hadoop.mapreduce.Reducer.Context context)
              throws IOException,
                     InterruptedException

覆盖:

setup 在类中 org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>

抛出:

IOException

InterruptedException

reduce

protected void reduce(ImmutableBytesWritable row,
          Iterable<Put> puts,
          org.apache.hadoop.mapreduce.Reducer.Context context)
               throws IOException,
                      InterruptedException

覆盖:

reduce 在类中 org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>

抛出:

IOException

InterruptedException