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azureazure-functions
Alf Kåre Lefdal
Alf Kåre Lefdal

Reputation: 723

Azure Functions: Application freezes - without any error message

I have an Azure Functions application which once in a while "freezes" and stops processing messages and timed events.

When this happens I do not see anything in the logs (AppInsight), neither exceptions nor any kind of unfamiliar traces.

The application has following functions:

Our production app runs fine. This is due to an internal dashboard (on big screen in the office), which polls one of the HTTP endpoints every 5 minutes, there by keeping it alive.

Our test, stage and preproduction apps stop after a while, stopping to process messages and timer events.

This question is more or less the same as my previous question, but the without error message that was in focus then. Much fewer error messages now, as our deployment has been fixed.

Upvotes: 1

Views: 3323

Answers (1)

Alf Kåre Lefdal
Alf Kåre Lefdal

Reputation: 723

A more detailed analysis can be found in the GitHub issue.

On a consumption plan, all triggers are registered in the host, so that these can be handled, leading to my functions being called at the right time. This part of the host also handles scalability.

I had two bugs:

  1. Wrong deployment. Do zip based deployment as described in the Docs.
  2. Malformed host.json. Comments in JSON are not right, although it does work in most circumstances in Azure Functions. But not all.

The sites now works as expected, both concerning availability and scalability.

Thanks to the people in the Azure Functions team (Ling Toh, Fabio Cavalcante, David Ebbo) for helping me out with this.

Upvotes: 5

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