Exception "Did not find any initialized language workers" when executing dotnet-isolated workers

Question

I am using dotnet-isolated workers with queue triggers in my function app. The function works fine when enqueueing messages slowly one by one, but this exception occurs when I put hundreds of messages in the queue storage in a short time. Any ideas on how to solve this issue? Thank you in advance!

Answer 1

mintchocolate Thanks for posting your question in Microsoft Q&A. As described in this issue discussion, Did not find any initialized language workers error is a race condition issue which happens when the worker process starts/restarts.

Have you reviewed logs in application insights for the function app? That would indicate little more insight about the cause of the exception. If it doesn't help, then I suggest opening a new issue in azure-functions-dotnet-worker repo (similar issues with this exception) with details such as function runtime, invocation ID/function app name, code snippets, full error message/exception including stack trace etc.

The details will help our product team in investigating the backend logs and find the cause. I hope this helps and let me know if any questions.

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