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Drain Mode in Azure Functions

Rayis Imayev pulls the plug:

As requests to execute Azure Functions increase, then the demand for such compute resources is supported, but only while it is needed (scale-out). As requests fall, any extra resources and application instances drop off automatically (scale-in).

Recently Microsoft enabled a new Drain mode in Azure Functions, that allows for a graceful shutdown of the Azure Function host by completing inflight invocations and stops listening for new events from triggering sources.

Read on for the set of steps it performs, as well as the benefit it provides.