Set Azure Function App on Consumption Plan to 64 b

Question

The new "Consumption" tier plans that you can utilise for Functions don't allow you to change the process bitness via the Portal. Is some other way I can flip the process to 64 bits as it's required for DocDB access.

Answer 1

You can set this by API. But note that it is not officially supported until you see the option show up in the portal.

Here is an easy way to do it:

• Go to https://resources.azure.com/
• Find your function app, and go under config/web under it in the tree
• Edit and change use32BitWorkerProcess to false

Answer 2

Azure Functions consumption plan is billed based on resource consumption and executions. Consumption plan pricing includes a monthly free grant of 1 million requests and 400,000 GB-s of resource consumption per month. Customers can also run Functions within their App Service plan at regular App Service plan rates.

Source: Functions Pricing

Try to Kudu into the Function App based on the Consumption pricing tier App Service Plan, found out that the total disk space is 1GB, which is equivalent to the Free or Shared pricing tier of the standard App Service Plan.

Bitness

The Basic, Standard, and Premium tiers support 64-bit and 32-bit applications.

The Free and Shared plan tiers support 32-bit applications only.

Source: https://docs.microsoft.com/en-us/azure/app-service-web/web-sites-scale#bitness

The conclusion is the Consumption pricing tier App Service plan is equivalent t0 Free/Shared pricing tier App Service plan, which explains why it can only support 32-bit.

Answer 3

Currently, 64-bit selection is disabled for Azure Functions (both, in consumption and app service plans). We're working on some validation to enable that, so customers requiring a 64-bit can make that change.

One thing to note is that the DocumentDB team has added 32-bit support to their latest release (1.11.3), and although we haven't upgraded to that yet (which will happen), you can reference their package directly and use their client in Functions running in 32 bit.

David's answer also gives you a way to enable 64-bit today.