数据流以异步方式从一个块进入到另一个块当中，根据需要它通常在源或目标处进行缓存。
Data flows from one block to the next in an asynchronous fashion, often being buffered at the source or target until such time as it is needed.
这包括多异步消息传递、高速缓存、路由和对大数据流的处理。
This includes multiple asynchronous messaging, caching, routing, and the streaming of huge data.
如果不采用异步方式，则访问计划中的 SHIP 操作符顺序地执行，分别访问对应的昵称并生成排序后的数据流。
Without asynchrony, the SHIP operators in the plan execute sequentially to access the respective nicknames and to generate sorted streams of data.
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