SecondarySort (Hadoop 1.2.2-SNAPSHOT API)

```
public class SecondarySort
extends Object
```
This is an example Hadoop Map/Reduce application. It reads the text input files that must contain two integers per a line. The output is sorted by the first and second number and grouped on the first number. To run: bin/hadoop jar build/hadoop-examples.jar secondarysort in-dir out-dir

嵌套类
限定符和类型	类和说明
`static class`	`SecondarySort.FirstGroupingComparator` Compare only the first part of the pair, so that reduce is called once for each value of the first part.
`static class`	`SecondarySort.FirstPartitioner` Partition based on the first part of the pair.
`static class`	`SecondarySort.IntPair` Define a pair of integers that are writable.
`static class`	`SecondarySort.MapClass` Read two integers from each line and generate a key, value pair as ((left, right), right).
`static class`	`SecondarySort.Reduce` A reducer class that just emits the sum of the input values.

构造器
构造器和说明
`SecondarySort()`

方法
限定符和类型	方法和说明
`static void`	`main(String[] args)`

public static void main(String[] args)
                 throws Exception

类 SecondarySort