消息：两个系统连接到一个公用的消息系统，互相交换数据，并利用消息调用行为。
Messaging: two systems connect to a common messaging system and exchange data and invoke behavior using messages.
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.
在图 3 中，我想将 5个框全部连接起来，但如果不使至少两条线相交就无法做到这一点。 您可以看到，我没有其它方法将框3 和 5连接起来。
In Figure 3, I would like to fully connect five bubbles but cannot do so without having at least two lines cross each other.
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