Blob already exists azure storage account

Question

Hello there. I got this issue pertaining Storage account particularly its blob container.

It is link to Filebeat using the following data below:

eventhub: <eventhub_name>

cosumer_group: <consumer_group_name>

connection_string: <ehub_connection_string>

storage_account: <sa_name>

storage_account_container: <container_name>

storage_account_key: <sa_key>

I'm getting this error from the Filebeat log "RESPONSE Status: 409 The specified blob already exists." when the Filebeat is restarted. The Access policy of the container is already set to be able to READ,WRITE and DELETE.

I'm not quite sure if I did miss some additional setup here. Maybe your expertise might be able to pin point that if there is any. TIA!

Answer 1

Hello Jomar Secuya

Welcome to Microsoft Q&A, thanks for posting your query.

I understand that that you are encountering an error in the Filebeat log stating, "RESPONSE Status: 409 The specified blob already exists," upon restarting Filebeat.

The above error message "RESPONSE Status: 409 The specified blob already exists." indicates that Filebeat is trying to write a blob to the Azure Blob Storage container, but a blob with the same name already exists. This can happen for several reasons, especially when Filebeat is restarted and attempts to reprocess data.

If Filebeat is appending a timestamp or a unique identifier to the blob names, ensure the naming scheme is robust enough to avoid generating duplicate names, especially during restarts.If your application logic involves processing the same data multiple times, you might need to implement deduplication mechanisms to prevent duplicate blobs.

I suggest that you review the Storage Account Configuration. If you are utilizing Append Blobs, please verify that you are employing the appropriate append operations within your Filebeat configuration. The improper use of block blob operations with the same name may result in this error. While you've mentioned READ, WRITE, and DELETE access, double-check that these permissions are correctly granted to the entity (user, service principal) used by Filebeat to interact with the storage account.

Post which Please review the configuration of your Filebeat output pipeline. Verify that the output path specified within the container is accurate and that there are no complications regarding the creation of blob paths by Filebeat. Additionally, assess the restart behavior of Filebeat. If it is resuming from a prior state, it may attempt to write files that have already been recorded before the restart.

I suggest that you follow the steps outlined below in the Azure portal to address the issue.

• Carefully examine the Filebeat logs for any additional error messages or clues about the cause of the "409 Conflict" error.
• Inspect the blobs in the container to see if there are any duplicate files or files with unexpected names.

Send a single test event through your pipeline to isolate the issue. Temporarily simplify your Filebeat pipeline (e.g., remove any complex filtering or transformations) to see if it resolves the issue.

Example code:

Note- It is advisable to refrain from hardcoding your storage account key directly within the configuration file. Instead, consider utilizing environment variables or a more secure approach, such as Azure Key Vault, for the storage and retrieval of your credentials.

If you continue to face issues, please provide the following information for further assistance:

• Relevant sections of your Filebeat configuration file.
• The exact error message from the Filebeat logs.
• Any recent changes made to your Filebeat configuration or your Azure environment.

References:

https://learn.microsoft.com/en-us/troubleshoot/azure/azure-storage/blobs/alerts/troubleshoot-storage-client-application-errors?tabs=dotnet#the-client-is-receiving-http-409-conflict-messages

Please let us know if you have any further queries. I’m happy to assist you further.

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