白盒子是可互相交换的，主应用程序可能把集群中的任何机器指派为控制者，而这个机器就把map和reduce任务分派给其它连接的白盒子。
White boxes are interchangeable, and the main application may assign any machine in the cluster as the controller, and this one in turn assigns map or reduce tasks to other connected white boxes.
其它的工作任务由主管指派或公司业务的需求。
Other tasks assigned by leader or company business required.
其它的工作任务由主管指派或公司业务的需求。
Other tasks assigned by leader or company business required.
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