Function app Huge I/O ~1 Million requests per day

[vance]

I noticed my bill was about $20 fatter last month... upon investigation, it was from a storage account tied to a dynamic plan Function app. This app is not used in prod. However, it had a timed function that ran every five minutes or so as an experiment to help Azure resolve another issue. Azure/azure-functions-host#298 (comment)

I'm wondering if there is a bug in the Function App container, if it's writing 60k log entries every time there's a cold start, or if it's just doing that for no reason...

Anyway, it's writing about 60k files per minute. I terminated the app container.

[lindydonna]

Can you share your function app name, either directly or indirectly?

[vance]

I filed an actual support ticket, will update.

[lindydonna]

Support is the right avenue for this, but let us know if there are opportunities for improving the billing experience. CC @dariagrigoriu

[lindydonna]

Closing this issue since you opened a support ticket.

[nandowalter]

I've the same exact problem. I've a function with a timer trigger and thousand of unexpected write operation on storage account.
Did you found the cause for this?

[vance]

While they tried hard to identify the issue, this was never resolved from the support ticket.