For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
"We have a quern stone for grinding flour for bread. We've got pottery and glass for eating and drinking" says Dr Andy Seaman.，详情可参考91视频
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