Hi Azure team, recently I'm trying out Azure function app but run into weird issues where deployed function disappears after running for a short period of time, the steps to reproduce are as below: create function app "echo4" verify https://echo4.azurewebsites.net is accessible create function "echo42" using visual studio code and deploy. verify https://echo4.azurewebsites.net/api/echo42 is accessible and returns 200 with result, and in azure portal, "echo42" is visible in functions list. after certain time (not sure exactly how long, last tested was 30 mins - 45 mins) https://echo4.azurewebsites.net is still accessible, but https://echo4.azurewebsites.net/api/echo42 is not longer accessible, returning 404 when invoking https://echo4.azurewebsites.net/api/echo42 navigate to azure portal, "echo42" is no longer visible Not sure what actually causes it but it's very annoying, tried redeploying the function but after a while it disappeared again, repeated a few times but results were all the same. Function model is v4, runtime is nodejs 18. Any insight would be very appreciated.

Azure function disappears after running for a while

Charles Huang 21

Hi Azure team, recently I'm trying out Azure function app but run into weird issues where deployed function disappears after running for a short period of time, the steps to reproduce are as below:

create function app "echo4"
verify https://echo4.azurewebsites.net is accessible
create function "echo42" using visual studio code and deploy.
verify https://echo4.azurewebsites.net/api/echo42 is accessible and returns 200 with result, and in azure portal, "echo42" is visible in functions list.
after certain time (not sure exactly how long, last tested was 30 mins - 45 mins)
https://echo4.azurewebsites.net is still accessible, but https://echo4.azurewebsites.net/api/echo42 is not longer accessible, returning 404 when invoking https://echo4.azurewebsites.net/api/echo42
navigate to azure portal, "echo42" is no longer visible

Not sure what actually causes it but it's very annoying, tried redeploying the function but after a while it disappeared again, repeated a few times but results were all the same.

Function model is v4, runtime is nodejs 18.

Any insight would be very appreciated.

VenkateshDodda-MSFT 18,086 Reputation points Microsoft Employee

2023-03-21T06:51:46.98+00:00
@Charles Huang Thank you for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.
Based on the shared information, we have looked at the backend logs of your function app and we are able to see that your function app echo4 is running with single HTTP Trigger function (echo 42).

Could you please try the below steps and do let us know if the issue still persists.

Try restarting your function app.

Sync the function app trigger using these REST API

Add this app setting: "AzureWebJobsFeatureFlags" value set to "DisableWorkerIndexing"
Charles Huang 21 Reputation points

2023-03-22T00:32:03.1033333+00:00

Hi @VenkateshDodda-MSFT ,

Thank you for getting back to me, just wondering, I've never actually "sync'ed" the function app manually before, all I've done was creating a new function echo42 and then use "Azure Functions: Deploy to Function App" command to deploy my function. Does that actually internally invoke the function app trigger? and if it does, is it calling the REST API you referred to above?

While I'm waiting for your response, i'll in the mean time adjust the app setting and restart my function app echo4 as per your suggestion and then redeploy my function and update my findings here.

Thank you,

Charles

Charles Huang 21

Hi @VenkateshDodda-MSFT ,

It seems to me after setting "AzureWebJobsFeatureFlags" value to "DisableWorkerIndexing" rendered vscode "Azure Functions: Deploy to Function App" not deploying functions any longer, it says deployment finished but function "echo42" does not appear in azure portal.

The log is as below:

11:32:31 AM echo4: Starting deployment...
11:32:31 AM echo4: Creating zip package...
11:32:31 AM echo4: Zip package size: 430 kB
11:32:41 AM echo4: Updating submodules.
11:32:41 AM echo4: Preparing deployment for commit id 'c79ef84c8e'.
11:32:42 AM echo4: Skipping build. Project type: Run-From-Zip
11:32:42 AM echo4: Skipping post build. Project type: Run-From-Zip
11:32:42 AM echo4: Triggering recycle (preview mode disabled).
11:32:42 AM echo4: Deployment successful.
11:32:57 AM echo4: Started postDeployTask "npm install (functions)".
11:33:08 AM echo4: Syncing triggers...
11:33:20 AM echo4: Querying triggers...
11:33:27 AM echo4: No HTTP triggers found.
11:36:45 AM echo4: Starting deployment...
11:36:45 AM echo4: Creating zip package...
11:36:45 AM echo4: Zip package size: 430 kB
11:36:53 AM echo4: Updating submodules.
11:36:54 AM echo4: Preparing deployment for commit id 'ef57c6f816'.
11:36:54 AM echo4: Skipping build. Project type: Run-From-Zip
11:36:55 AM echo4: Skipping post build. Project type: Run-From-Zip
11:36:55 AM echo4: Triggering recycle (preview mode disabled).
11:36:56 AM echo4: Deployment successful.
11:37:08 AM echo4: Started postDeployTask "npm install (functions)".
11:37:18 AM echo4: Syncing triggers...
11:37:28 AM echo4: Querying triggers...
11:37:29 AM echo4: No HTTP triggers found.

VenkateshDodda-MSFT 18,086 Reputation points Microsoft Employee

2023-03-24T12:35:46.89+00:00

@Charles Huang Thanks for your response. Apologize for the delay in my response. This would need one on one offline support and I will suggest you open a support ticket to check and assist you further on this.
Charles Huang 21 Reputation points

2023-03-26T23:03:29.93+00:00

@VenkateshDodda-MSFT Hey mate thanks, I was directed by offline support to seek help here, because they couldn't help me at all, and they said once I open this one they'll set the priority to 1 and escalated internally, which I thought you were from the internal team who's helping?
VenkateshDodda-MSFT 18,086 Reputation points Microsoft Employee

2023-03-27T10:19:20.7733333+00:00

@Charles Huang Thanks for your response. The offline support that I have mentioned is different. when you raise a support ticket, an engineer from function team will get in contact with you to investigate further and to assist you better.

In case if you don't have the support plan then please send an email with your Subscription and link to this thread to AzCommunity@microsoft.com with subject line as "ATTN: Venkatesh" so I can enable one-time free support on your subscription to assist you further.
Charles Huang 21 Reputation points

2023-03-27T10:29:27.7033333+00:00

Alright email sent, thanks @VenkateshDodda-MSFT !
Mircea Trofimciuc 5 Reputation points

2023-08-28T21:11:19.1966667+00:00

I'm having the same issue. Was this error ever solved @VenkateshDodda-MSFT ?
Heroes 5 Reputation points

2023-12-08T13:48:29.9166667+00:00

Same issue here. Was this resolved?? @VenkateshDodda-MSFT
Sergio 10 Reputation points

2024-02-13T00:03:24.1966667+00:00

I'm having the same issue too, is there any update? @VenkateshDodda-MSFT
Nicolini, Maicol 0 Reputation points

2024-04-03T07:36:57.0033333+00:00

Did someone solve this issue? I'm having the same problem @VenkateshDodda-MSFT