Azure Functions
An Azure service that provides an event-driven serverless compute platform.
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How to resolve error 500: An error occurred while communicating with Azure Storage errors from a durable function?
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Tiaan Smit
31
Reputation points
We were getting constant communication errors from our blob store linked to an Azure function app and from the exception message it seems to originate from the durable functions library which we use to persist data for function executions.
Previously we would occasionally get the exception, amounting to a couple of failed request every hour. Which for our data volumes is not really a big problem. However 2 days ago it then jumped up to nearly 100 per hour for the last 2 days before it dropped back down. Looking into it, our throughput volumes did not change. Nothing regarding the data that is being sent or the configuration of either resources changed.
Has anyone else experienced the same behavior with the blob storage?
Full exception message returned
Exception while executing function: Functions.FunctionName Result: Failure Exception: The operation failed with an unexpected status code: 500. Details: {"Message":"Something went wrong while processing your request","ExceptionMessage":"An error occurred while communicating with Azure Storage","ExceptionType":"DurableTask.AzureStorage.Storage.DurableTaskStorageException","StackTrace":" at DurableTask.AzureStorage.Storage.ClientResponseExtensions.DecorateFailure[T] in //src/DurableTask.AzureStorage/Storage/ClientResponseExtensions.cs:line 46\r\n at DurableTask.AzureStorage.Storage.Blob.DownloadStreamingAsync(CancellationToken cancellationToken) in //src/DurableTask.AzureStorage/Storage/Blob.cs:line 119\r\n at DurableTask.AzureStorage.MessageManager.DownloadAndDecompressAsBytesAsync(Blob blob, CancellationToken cancellationToken) in //src/DurableTask.AzureStorage/MessageManager.cs:line 237\r\n at DurableTask.AzureStorage.Tracking.AzureTableTrackingStore.ConvertFromAsync(OrchestrationInstanceStatus orchestrationInstanceStatus, String instanceId, CancellationToken cancellationToken) in //src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs:line 474\r\n at DurableTask.AzureStorage.Tracking.AzureTableTrackingStore.FetchInstanceStatusInternalAsync(String instanceId, Boolean fetchInput, CancellationToken cancellationToken) in //src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs:line 417\r\n at DurableTask.AzureStorage.Tracking.AzureTableTrackingStore.GetStateAsync(String instanceId, Boolean allExecutions, Boolean fetchInput, CancellationToken cancellationToken)+MoveNext() in //src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs:line 373\r\n at System.Linq.AsyncEnumerable.
Azure Functions
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Shireesha Eeraboina 3,345 Reputation points Microsoft External Staff Moderator2025-06-03T06:41:20.41+00:00 Hi Tiaan Smit,
If you are still facing the issue, could you please check the private message and provide the required details for further troubleshooting?
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Praveen Kumar Gudipudi 1,085 Reputation points Microsoft External Staff Moderator2025-06-05T01:12:06.6833333+00:00 Hello Tiaan Smit,
Could you please check your storage account, If your application is making a large number of requests in a short time, it could lead to throttling error.
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Praveen Kumar Gudipudi 1,085 Reputation points Microsoft External Staff Moderator
2025-06-09T00:49:01.29+00:00 Hello Tiaan Smit,
We haven't heard back from you yet, and I wanted to ensure everything is on track and see if there's anything more, we can assist you with.
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Tiaan Smit 31 Reputation points
2025-06-09T06:55:37.5166667+00:00 Hi Praveen
We are making quite a lot of requests to the storage account, but as mentioned in the original post the volume of request did not change during the time that the number of errors we received went up. Is there any way to get additional info on that error that could indicate whether it had to do with throttling?
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Praveen Kumar Gudipudi 1,085 Reputation points Microsoft External Staff Moderator
2025-06-09T07:36:19.2766667+00:00 Hello Tiaan Smit,
Based on the error logs you've shared, the exception is being thrown by the Durable Task Framework when it tries to read or write data to Azure Blob Storage. This typically happens when the Durable Functions backend (Azure Storage) experiences transient failures, like network hiccups or throttling.
Even though your application's throughput hasn’t changed, there are a few potential causes for the spike in failures:
- Transient Azure Storage Issues: Occasionally, Azure Storage may experience brief periods of degraded performance. This usually resolves itself automatically, which seems to be the case here as the issue dropped back down.
- Throttling or Limits: If the storage account is under heavy load (yours or shared tenants in the same region), operations can fail with HTTP 500s or timeouts. Durable Functions rely heavily on Azure Storage (Tables, Blobs, Queues), so latency in any of these can impact reliability.
- Durable Task Library Retrying: The Durable Task Framework will automatically retry transient errors, but if the backend storage continues to respond with 500 errors, it eventually fails the orchestration.
Here are a few steps to help reduce or avoid future issues:
- Enable Storage Metrics & Diagnostics
- In the Azure Portal, go to your Storage Account → Monitoring → Metrics.
- Look for high values in
Availability,Server Errors,Throttling Errors, orLatency. - Enable diagnostic logs to capture request failures and analyze trends.
- Scale Up Your Storage Tier or Switch to Premium
- If you're on Standard tier and seeing frequent throttling or latency, consider upgrading to Premium tier, which offers better throughput and lower latency.
- Use Azure Application Insights
- If not already enabled, use it to monitor Durable Function execution patterns, failure trends, and bottlenecks.
- Enable Durable Function Retry Policies
- For any activity or sub-orchestration, configure retry policies to gracefully handle transient issues:
Please check above steps and let us know with an update.
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Praveen Kumar Gudipudi 1,085 Reputation points Microsoft External Staff Moderator
2025-06-12T03:44:27.5066667+00:00 Hello Tiaan Smit,
Following up to see if you have chance to check my previous response and please let us know with an update to assist you further on this.
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Praveen Kumar Gudipudi 1,085 Reputation points Microsoft External Staff Moderator
2025-06-13T04:48:59.3633333+00:00 Hello Tiaan Smit,
We haven't heard back from you yet, and I wanted to ensure everything is on track and see if there's anything more, we can assist you with.
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