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

Question

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

David McDougald 40

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?

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David McDougald 40 Reputation points

2024-09-12T07:37:54.3166667+00:00

Thank you for your reply.

Unfortunately, after using the kudo console to modify the host.json and restarting the logic app, I still receive the same error, and the variable limit remains unchanged.

I also tried to set the value as a number instead of a string, and that had no effect. Please advise.

If it helps, viewing the file through VSCODE extension, the extensions claims that workflow is not a valid property:
JananiRamesh-MSFT 29,436 Reputation points Moderator

2024-09-12T08:48:40.28+00:00

@David McDougald Thanks for getting back could you please try adding the id as below
"id": "Microsoft.Azure.Functions.ExtensionBundle.Workflows",
David McDougald 40 Reputation points

2024-09-12T14:13:53.24+00:00

Under which level of the JSON?

JananiRamesh-MSFT 29,436 Moderator

@David McDougald please try adding it as below,

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

JananiRamesh-MSFT 29,436 Reputation points Moderator

2024-09-17T04:42:45.19+00:00

@David McDougald Just checking to see if you have chance to see previous response and helped. Please let us know if you have further query or issue remains.

Answer accepted by question author

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David McDougald 40 Reputation points

2024-09-12T07:37:54.3166667+00:00

Thank you for your reply.

Unfortunately, after using the kudo console to modify the host.json and restarting the logic app, I still receive the same error, and the variable limit remains unchanged.

I also tried to set the value as a number instead of a string, and that had no effect. Please advise.

If it helps, viewing the file through VSCODE extension, the extensions claims that workflow is not a valid property:
JananiRamesh-MSFT 29,436 Reputation points Moderator

2024-09-12T08:48:40.28+00:00

@David McDougald Thanks for getting back could you please try adding the id as below
"id": "Microsoft.Azure.Functions.ExtensionBundle.Workflows",
David McDougald 40 Reputation points

2024-09-12T14:13:53.24+00:00

Under which level of the JSON?
JananiRamesh-MSFT 29,436 Reputation points Moderator

2024-09-16T03:27:44.0433333+00:00

@David McDougald please try adding it as below,

{ "version": "2.0", "extensionBundle": { "id": "Microsoft.Azure.Functions.ExtensionBundle.Workflows", "version": "[1.*, 2.0.0)" }, "extensions": { "workflow": { "settings": { "Runtime.Backend.VariableOperation.MaximumStatelessVariableSize": "2048" } } } }
JananiRamesh-MSFT 29,436 Reputation points Moderator

2024-09-17T04:42:45.19+00:00

@David McDougald Just checking to see if you have chance to see previous response and helped. Please let us know if you have further query or issue remains.

Answer 1

JananiRamesh-MSFT 29,436 Moderator

@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.

David McDougald 40 Reputation points

2024-09-17T11:07:05.0533333+00:00

Yes, thank you. That JSON object did increase the variable size limit.
JananiRamesh-MSFT 29,436 Reputation points Moderator

2024-09-18T11:40:33.9666667+00:00

David McDougald Thanks for the update. Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.

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

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