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[TOC]

# 分析

Hadoop為每個作業維護若干內置計數器,以描述多項指標.

API

1. 采用枚舉的方式統計計數
~~~
enum MyCounter{MALFORORMED, NORMAL}

//對枚舉定義的自定義計數器加1
context.getCounter(MyCounter.MALFORORMED).increment(1);
~~~

2. 采用計數器組,計數器名稱的方式統計
~~~
context.getCounter("counterGroup", "countera").increment(1);
~~~

組名和計數器名稱隨便起,但最好有意義

計數器結果在程序運行后的控制臺上查看

# 代碼

![](https://box.kancloud.cn/a48b15f6f49e9e89e56b637986ac24de_993x880.png)

這個統計是全局的


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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