Logic App => Append To Variable Action => Array Variable Size

Question

I am receiving the following error in my flow:

the variable 'files' has size of more than '18467' bytes. This exceeded the maximum size '1024' configured. Please see https://docs.microsoft.com/en-us/azure/logic-apps/edit-app-settings-host-settings#variables for updating the maximum configured value.

When i visit the documentation on that page, it says I should add a new environmental variable to expand the variable size.

When I follow those instructions, I receive the same error when I retry the flow.

What am I doing wrong?

Answer 1

@David McDougald Thanks for reaching out. The configuration - MaximumStatelessVariableSize needs to go to host.json and not in the app settings, as mentioned in the below documentation - Edit runtime and environment settings for Standard logic apps - Azure Logic Apps | Microsoft Learn.

please refer: https://learn.microsoft.com/en-us/azure/logic-apps/edit-app-settings-host-settings?tabs=azure-portal#manage-host-settings---hostjson

Below is a sample host.json for increasing the variable size limit from 1024 to 2048 characters.

{
   "version": "2.0",
   "extensionBundle": {
      "id": "Microsoft.Azure.Functions.ExtensionBundle.Workflows",
      "version": "[1.*, 2.0.0)"
   },
   "extensions": {
      "workflow": {
         "settings": {
            "Runtime.Backend.VariableOperation.MaximumStatelessVariableSize": "2048"
         }
      }
   }
}

After making this change, ensure that you restart your Logic App for the new settings to take effect.

do let me know incase of further queries, I would be happy to assist you.