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  • Are you sure you don't just need to know that all of the other sub tasks have completed? Maybe each sub task should publish an event when it is done, and the main task can listen for these events and collect all the necessary information. Sounds like this will need to turn into a very asynchronous process. Commented May 14, 2019 at 12:44
  • @GregBurghardt We don't need only to know that other tasks have completed, we need some pieces of information. Also, I'm not sure that talking about 'main task' would be correct, I'd rather talk about most-upstream service and other downstream services. Commented May 14, 2019 at 12:55
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    "which have their priorities and concerns about passing this information" - could you edit the question to expand on that a bit? Seems like this is one of the key sources of the problem, so help us understand what is actually going on. What is the nature of these concerns? In what ways this affects them? Do they read and/or rearange this information, or simply pass it along without examining it? Maybe you just need better interfaces between the systems/services. Commented May 14, 2019 at 13:57
  • Is it right that some teams don't want to provide that additional info when sending Topic1 events? Perhaps introducing an augmented Topic1a with events allowing to transfer the same data as Topic1 events PLUS your information specific to A is the solution? B needs to subscribe to it and perform its extended processing only on that topic's events. Commented May 14, 2019 at 18:56