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I'm encountering a TaskCanceledException in my Azure Function, which uses the Singleton attribute. The exception seems to be related to the Singleton functionality. Here is the relevant part of my function:

[FunctionName("SampleSingletonFunction")]
        [Singleton]
        public async Task GenerateData([QueueTrigger("GenerateDataQueue")] string data,
            ILogger logger)
{
    try 
    {
       logger.LogTrace("Generate Data started.");
       
       var client = _httpClientFactory.CreateClient();
       var response = await client.GetAsync($"https://<url comes here>");
       if (response.IsSuccessStatusCode) 
       {
           logger.LogInformation("Success");
       }
       else 
       {
           logger.LogError("Failed");
       }
       logger.LogTrace("Generate Data completed.");
    }
    catch(Exception ex) 
    {
       logger.LogError(ex);
    }
}

Startup class:

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        // Register the BlobServiceClient with dependency injection
        builder.Services.AddAzureClients(clientBuilder =>
        {
        clientBuilder.AddBlobServiceClient(Settings.StorageConnection);
        });
     }
}

Host.json

{
    "version": "2.0",
    "functionTimeout": "02:00:00",
    "durableTask": {
        "maxConcurrentActivityFunctions": 10,
        "maxConcurrentOrchestratorFunctions": 10
    },
    "logging": {
        "applicationInsights": {
            "samplingExcludedTypes": "Request",
            "samplingSettings": {
                "isEnabled": false
            }
        },
        "logLevel": {
            "Host.Triggers.DurableTask": "Information"
        }
    }
}

The stack trace indicates that the exception is thrown from Azure.Core.CancellationHelper.ThrowOperationCanceledException. The function is supposed to process messages from an Azure Queue and update some static data tables.

System.Threading.Tasks.TaskCanceledException:
   at Azure.Core.CancellationHelper.ThrowOperationCanceledException (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at Azure.Core.CancellationHelper.ThrowIfCancellationRequested (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at Azure.Core.Pipeline.ResponseBodyPolicy.ThrowIfCancellationRequestedOrTimeout (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at Azure.Core.Pipeline.ResponseBodyPolicy+<ProcessAsync>d__5.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.LoggingPolicy+<ProcessAsync>d__9.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.HttpPipelineSynchronousPolicy+<InnerProcessAsync>d__5.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.RedirectPolicy+<ProcessAsync>d__7.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.RetryPolicy+<ProcessAsync>d__5.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.RetryPolicy+<ProcessAsync>d__5.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.HttpPipelineExtensions+<ProcessMessageAsync>d__0.MoveNext (Azure.Storage.Blobs, Version=12.19.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Threading.Tasks.ValueTask`1.get_Result (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Storage.Blobs.BlobRestClient+<GetPropertiesAsync>d__14.MoveNext (Azure.Storage.Blobs, Version=12.19.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Storage.Blobs.Specialized.BlobBaseClient+<GetPropertiesInternal>d__124.MoveNext (Azure.Storage.Blobs, Version=12.19.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Storage.Blobs.Specialized.BlobBaseClient+<GetPropertiesAsync>d__123.MoveNext (Azure.Storage.Blobs, Version=12.19.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.BlobLeaseDistributedLockManager+<ReadLeaseBlobMetadata>d__19.MoveNext (Microsoft.Azure.WebJobs.Host.Storage, Version=5.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host.Storage\Singleton\BlobLeaseDistributedLockManager.cs:337)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.BlobLeaseDistributedLockManager+<TryAcquireLeaseAsync>d__15.MoveNext (Microsoft.Azure.WebJobs.Host.Storage, Version=5.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host.Storage\Singleton\BlobLeaseDistributedLockManager.cs:175)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.BlobLeaseDistributedLockManager+<TryLockAsync>d__9.MoveNext (Microsoft.Azure.WebJobs.Host.Storage, Version=5.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host.Storage\Singleton\BlobLeaseDistributedLockManager.cs:83)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.SingletonManager+<TryLockAsync>d__19.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Singleton\SingletonManager.cs:125)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.SingletonManager+<LockAsync>d__18.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Singleton\SingletonManager.cs:99)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.SingletonLock+<AcquireAsync>d__26.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Singleton\SingletonLock.cs:82)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<ExecuteWithWatchersAsync>d__32.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:499)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<ExecuteWithLoggingAsync>d__26.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:306)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<ExecuteWithLoggingAsync>d__26.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:352)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<TryExecuteAsync>d__18.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:108)

Included trace logs:

Example failed execution: enter image description here

Example success execution: enter image description here What I've Tried:

  1. Checked Singleton Configuration: Verified that the Singleton attribute is correctly configured.
  2. Timeout Settings: Reviewed and adjusted the timeout settings in the host.json file. Function Timeout set for 2 hours.
  3. Blob Storage Access: Verified permissions and connectivity for accessing Azure Blob Storage. Despite these efforts, the issue persists.

Questions:

  1. What could be causing the TaskCanceledException in the context of the Singleton attribute?
  2. Are there any specific configurations or best practices for using the Singleton attribute with Azure Functions that I might be missing?
  3. How can I effectively debug and resolve this issue?

Any insights or suggestions would be greatly appreciated!

Improve this question
10
  • Provide your host.json. Commented Jan 9 at 8:22
  • 1
    I have added now in the question description. Please check now. @pravallika-kv Commented Jan 9 at 8:46
  • 1
    Included in the question. It is similar to original code. @pravallika-kv Commented Jan 9 at 9:00
  • 1
    added startup class @pravallika-kv Commented Jan 9 at 9:33
  • 1
    Yes - @PravallikaKV Commented Jan 22 at 14:00

1 Answer 1

Reset to default
1

I have used below code to implement Singleton in Queue Trigger Azure function.

SampleSingletonFunction.cs:

public class SampleSingletonFunction
{
    private readonly IHttpClientFactory _httpClientFactory;

    public SampleSingletonFunction(IHttpClientFactory httpClientFactory)
    {
        _httpClientFactory = httpClientFactory;
    }

    [FunctionName("SampleSingletonFunction")]
    [Singleton(Mode = SingletonMode.Listener)]
    public async Task GenerateData(
        [QueueTrigger("myqueue-items")] string data,
        ILogger logger)
    {
        try
        {
            logger.LogTrace("Generate Data started.");

            var client = _httpClientFactory.CreateClient();
            var response = await client.GetAsync($"https://google.com");
            if (response.IsSuccessStatusCode)
            {
                logger.LogInformation("Success");
            }
            else
            {
                logger.LogError("Failed");
            }
            logger.LogTrace("Generate Data completed.");
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "An error occurred while generating data.");
        }
    }
}

Startup.cs:

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        builder.Services.AddHttpClient();
    }
}

host.json:

{
  "version": "2.0",
  "logging": {
    "applicationInsights": {
      "samplingSettings": {
        "isEnabled": true,
        "excludedTypes": "Request"
      },
      "enableLiveMetricsFilters": true
    },
    "logLevel": {
      "default": "None",
      "Function": "Trace"
    }
  },
  "singleton": {
    "enabled": true
  }
}

local.settings.json:

{
    "IsEncrypted": false,
    "Values": {
        "AzureWebJobsStorage": "<Storage_Connection_String>",
        "FUNCTIONS_INPROC_NET8_ENABLED": "1",
        "FUNCTIONS_WORKER_RUNTIME": "dotnet"
    }
}

Output:

Functions:

        SampleSingletonFunction: queueTrigger

For detailed output, run func with --verbose flag.
[2025-01-09T13:19:43.689Z] Host lock lease acquired by instance ID '000000000000000000000000F72731CC'.
[2025-01-09T13:20:35.579Z] Executing 'SampleSingletonFunction' (Reason='New queue message detected on 'myqueue-items'.', Id=af2fdccb-80d3-4796-99c3-a9c63ac726c3)
[2025-01-09T13:20:35.590Z] Trigger Details: MessageId: 369295b9-bbe0-44b1-af74-c2f4bf248a6d, DequeueCount: 1, InsertedOn: 2025-01-09T13:20:33.000+00:00
[2025-01-09T13:20:35.615Z] Generate Data started.
[2025-01-09T13:20:38.768Z] Success
[2025-01-09T13:20:38.771Z] Generate Data completed.
[2025-01-09T13:20:38.787Z] Executed 'SampleSingletonFunction' (Succeeded, Id=af2fdccb-80d3-4796-99c3-a9c63ac726c3, Duration=3304ms)

Logs in Application Insights:

enter image description here

enter image description here

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2 Comments

Can you try to push multiple queues(20 or 30 items) in same time and monitor the execution? Real case is like that
Will check and update.

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