After I sent a message to my GCP subscription, it takes a minute or two (should be instant) to appear in my Nifi flow. At this point, I see a bunch of XML and my payload isn't there. Does anyone know what's possibly happening?
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Please provide more detail, such as the flow definition, configuration values for the relevant processors, an example of "a bunch of XML" in the flowfile content, and the expected payload value. – Andy Apr 28 '20 at 20:54
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If your push messages are not acknowledged then it may slow down delivery of the rest significantly.
Your use case looks more like the endpoints don't acknowledge it's delivery instantly (or acknowledgement is late due to some other reasons). If the message is not acknowledged immediately then a system will retry to deliveer it (with some delay) and it will keep trying untill it's acknowledged.
Also look at the Message Flow Control documentation which albo may point you to a solution.
Similar topic was also discussed here in StackOverflow (which might help you).
Wojtek_B
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