如果有不妥之处，还望大佬们批评指正，感谢。
Not all streaming workloads involve I/O. When your source is in-memory and your transforms are pure functions, async machinery adds overhead without benefit — you're paying for coordination of "waiting" that adds no benefit.
，更多细节参见同城约会
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Author(s): W. Tanner Yorgason, Andrea M. Jokisaari, Christopher L. Muhich