MapReduce全局程序计数器Counters

文章目录Counters定义以源码的TaskCounter计数器为例自定义Counter例子 Counters定义 Counters represent global counters, defined either by the MapReduce framework or applications. Each Counter can be of any Enum type. Counters of a particular Enum are bunched into groups of type Counters.Group. Applications can define arbitra