Is it possible to fix a cap on the number of servers on which the azure functions scale? I have a consumption plan and basically I would like to set a cap on the number of resources that azure functions can use. The only solutions I found are: set a cap for daily GB/sec threshold, after which the functions are stopped until the following day, which is definitely something I do not want because I need to use some functions for online tasks. In the host.json, changing parameters for http.maxConcurrentRequests and http.maxOutstandingRequests , which will affect the number of concurrent functions running. Is this the thing should I look into? isn't this setting per-server level? my fear is that this won't end up capping resources, but insted will let Azure create just more and more servers, in order to comply with request loads

Reputation: 51

Limit number of servers on Azure functions (consumption plan)

Is it possible to fix a cap on the number of servers on which the azure functions scale? I have a consumption plan and basically I would like to set a cap on the number of resources that azure functions can use.

The only solutions I found are:

set a cap for daily GB/sec threshold, after which the functions are stopped until the following day, which is definitely something I do not want because I need to use some functions for online tasks.
In the host.json, changing parameters for http.maxConcurrentRequests and http.maxOutstandingRequests, which will affect the number of concurrent functions running. Is this the thing should I look into? isn't this setting per-server level? my fear is that this won't end up capping resources, but insted will let Azure create just more and more servers, in order to comply with request loads

Upvotes: 2

Answers (2)

loomchild

Reputation: 778

One thing to note is that timer-triggered functions are automatically singletons. In my case that was sufficient, as I can wake-up such function every minute and process specific amount of data. Even if the function takes longer than expected, there's no risk a second one will be run concurrently.

More info: https://stackoverflow.com/a/53919048/4619705

Upvotes: 0

Simon Luckenuik

Reputation: 355

You can use the WEBSITE_MAX_DYNAMIC_APPLICATION_SCALE_OUT app setting: The maximum number of instances that the function app can scale out to. Default is no limit. Note: This setting is a preview feature - and only reliable if set to a value <= 5

Ref: https://learn.microsoft.com/en-us/azure/azure-functions/functions-app-settings#websitemaxdynamicapplicationscaleout

Upvotes: 2

Limit number of servers on Azure functions (consumption plan)

Answers (2)

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