类 org.apache.hadoop.mapreduce.Partitioner
的使用

使用Partitioner的程序包

程序包	说明
org.apache.hadoop.examples	Hadoop example code.
org.apache.hadoop.mapreduce
org.apache.hadoop.mapreduce.lib.partition

org.apache.hadoop.examples中Partitioner的使用

org.apache.hadoop.examples中Partitioner的子类

限定符和类型	类和说明
static class	SecondarySort.FirstPartitioner Partition based on the first part of the pair.

org.apache.hadoop.mapreduce中Partitioner的使用

返回变量类型为Partitioner的类型的org.apache.hadoop.mapreduce中的方法

限定符和类型	方法和说明
Class<? extends Partitioner<?,?>>	JobContext.getPartitionerClass() Get the Partitioner class for the job.

类型变量类型为Partitioner的org.apache.hadoop.mapreduce中的方法参数

限定符和类型	方法和说明
void	Job.setPartitionerClass(Class<? extends Partitioner> cls) Set the Partitioner for the job.

org.apache.hadoop.mapreduce.lib.partition中Partitioner的使用

org.apache.hadoop.mapreduce.lib.partition中Partitioner的子类

限定符和类型	类和说明
class	BinaryPartitioner<V> Partition BinaryComparable keys using a configurable part of the bytes array returned by BinaryComparable.getBytes().
class	HashPartitioner<K,V> Partition keys by their Object.hashCode().
class	KeyFieldBasedPartitioner<K2,V2> Defines a way to partition keys based on certain key fields (also see KeyFieldBasedComparator.
class	TotalOrderPartitioner<K extends WritableComparable<?>,V> Partitioner effecting a total order by reading split points from an externally generated source.