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yihaoDeng avatar yihaoDeng commented on August 15, 2024

这是你们画的图...
2017-01-19 3 10 10

这是官网的图

2017-01-19 6 22 03

为什么同样的参数,time 行的间隔时间却不相同

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yihaoDeng avatar yihaoDeng commented on August 15, 2024

还是我理解错了??

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lw-lin avatar lw-lin commented on August 15, 2024

@yihaoDeng

是的,这里跟官网的图略不一样。这里两个图里的 arriving records 的时间不一样,所以画出来的 time 行不完全一样,但对于各自的例子都是正确的 —— 本系列文章的 trigger 是 ProcessingTime(10min), 官网的 trigger 是 ProcessingTime(5min)

为什么要跟官网的图不太一样?

因为官网的图没有根据 watermark 画出 append mode 和 update mode 的输出;而如果试图画出时,就发现官网 arriving records 的设置将导致 append mode 在 3 个 batch 内看不到输出。而本系列文章,在对 arriving records 做了调整之后,会在第 3 个 batch 产生输出。官网的例子是当时还没支持 watermark 时就已经存在了,而在后面支持了 watermark 之后没有进行调整。本系列文章则针对性进行了调整。

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ZiyueHuang avatar ZiyueHuang commented on August 15, 2024

请问一下,现在这个《1.2 Structured Streaming 之 Output Modes 解析》在哪里?

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lw-lin avatar lw-lin commented on August 15, 2024

@ZiyueHuang 没有完成。不过从其他章节里也基本上能看到 Output Modes 的全貌。

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