Azure Functions
An Azure service that provides an event-driven serverless compute platform.
Azure Durable Function Status Query Endpoint randomly refuses Connection
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(86.4, 2%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EFF%3C/text%3E%3C/svg%3E)
Fabian Franz
31
Reputation points
I have an Azure Durable Function (Functions Platform V4), hosted on Windows in a Premium Plan (EP1) in Azure located in West Europe.
The Client Function gets triggered by a React app, that makes HTTP calls to it. To show our users the result of the orchestration, the client calls starter.CreateCheckStatusResponse() on the instance of IDurableOrchestrationClient.
The React app code reads the statusQueryGetUrl from the clients response, and polls the provided query endpoint.
I recently fixed the issue, that (even though we are running on a Premium Plan) the query endpoint sometimes returns an HTTP Status Code 503 - Service Unavailable.
However, sometimes the Function just seems to refuse the connection and does not provide any status code, as shown in the screenshot below:
I honestly don't know where to find the issue, and on my opinion neither this nor the response of a Http Status Code 503 - Service Unavailable should happen, since Azure Functions running on a Premium Plan are guranteed to be available 99.95% regarding the SLA.
I have executed about 10 requests yesterday on our production system, and for 6 of them this happened.
When I look through the Diagnose and Solve Problems tab within the Azure Portal, it doesn't show me any issues.
Azure Functions
Azure Static Web Apps
Azure Static Web Apps
An Azure service that provides streamlined full-stack web app development.
Developer technologies | .NET | Other
Developer technologies | .NET | Other
Microsoft Technologies based on the .NET software framework. Miscellaneous topics that do not fit into specific categories.
Developer technologies | C#
Developer technologies | C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
{count} votes
-
MayankBargali-MSFT 70,986 Reputation points Moderator2023-08-02T09:49:30.8866667+00:00 @Fabian Franz Thanks for reaching out. Can you please confirm whether the request is reached out to your Durable function by reviewing the runs?
In the Diagnose and Solve Problems are you getting any of the failed run's details? There might be changes that the request hasn't reached the function.
-
Fabian Franz 31 Reputation points
2023-08-02T11:04:09.2866667+00:00 Hi @MayankBargali-MSFT and thanks for responding.
The request reaches out to my Durable Function and all of the activites are executed as expected. There is no failure in any function run.The only thing that randomly crashes sometimes is the status query endpoint, that gets created by calling
CreateCheckStatusResponse()fromIDurableOrchestrationClient. -
Fabian Franz 31 Reputation points
2023-08-03T08:05:47.7933333+00:00 after reaching out to the Azure Support Team the problem seems to occur due to ongoing maintenance activity, which is scheduled from July 24, 2023, 5:30 UTC to August 3, 2023 5:30 UTC.
They recommended to keep an eye on the situation until maintenance activities are completed.
I'll check if this still occurs tomorrow, August 4 2023. If not I will post maintenance activities as a possible cause of this issue to the answear on this question.
Is there a page where users can check for ongoing maintenance for their service and or location?
If a page like this exists, I would highly appreciate it, if you could post a link here. -
MayankBargali-MSFT 70,986 Reputation points Moderator
2023-08-03T10:25:29.3433333+00:00 @Fabian Franz Thanks for the update. If it is planned maintenance, then it should show it under the service health --> Planned Maintenance and you can refer to this document for more details.
-
Deleted
This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
-
Fabian Franz 31 Reputation points
2023-08-10T12:24:24.53+00:00 @MayankBargali-MSFT thanks for your advice regarding the "Planned Maintencace" information in the Service Health service in the Azure portal.
We are currently still monitoring our application to make sure this issue happened due to ongoin mantenance activites.
I'll give you and update once our monitoring has finished.
Sign in to comment
Sign in to answer