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Documents limitations of calls to external resources in flows.

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Joel Dudley 2018-03-13 09:34:00 +00:00 committed by GitHub
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docs/source/api-flows.rst
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@ -745,6 +745,12 @@ We then update the progress tracker's current step as we progress through the fl
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HTTP and database calls
-----------------------
HTTP, database and other calls to external resources are allowed in flows. However, their support is currently limited:
* The call must be executed in a BLOCKING way. Flows don't currently support suspending to await the response to a call to an external resource
* The call must be idempotent. If the flow fails and has to restart from a checkpoint, the call will also be replayed
Concurrency, Locking and Waiting
--------------------------------