# Functions
分布式执行mapReduce任务,通过rpc在主服务器上注册的workers调度map和reduce任务.
nReduce 当前map执行的reduce编号
从输入文件infile中读取内容
通过mapF对内容进行处理，分割map输出
将指定文件结果解析为key/value
创建nReduce个中间文件名称
*/.
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自定义map func.
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自定义reduce func.
中间文件名称.
启动worker，与master建立链接.
设置worker标识.
# Constants
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# Structs
任务参数结构，存储任务相关的信息.
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工作者，等待DOTask任务或者shutDown任务.