// Concatenate pending data with new chunks
Data flows left to right. Each stage reads input, does its work, writes output. There's no pipe reader to acquire, no controller lock to manage. If a downstream stage is slow, upstream stages naturally slow down as well. Backpressure is implicit in the model, not a separate mechanism to learn (or ignore).，详情可参考91视频
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pixels checkpoint delete mybox ready，这一点在旺商聊官方下载中也有详细论述
Author(s): Junwei Che, Xuezhi Wang