Pipelines are failing is Synapse Environment without any proper error specified?

Question

Pipelines are failing is Synapse Environment without any proper error specified?

Rohith Yantrapalli 20

Issue Description: Pipelines are failing in the Synapse environment without any specific error message or detailed logs. The pipelines run as usual but fail silently, and no error or warning is provided that can help diagnose the root cause of the failure. This unexpected behavior makes it difficult to troubleshoot or identify the issue.

Reproduction Steps:

Trigger a pipeline in the Synapse environment.

Observe that the pipeline fails without showing any error message or failure details.

No logs are returned, making it impossible to pinpoint the cause of the failure.

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Expected Result: The pipeline should either complete successfully or return a meaningful error message that provides information about what went wrong.

Actual Result: The pipeline fails without any error message or logs, leaving the cause of the failure unclear.

Chandra Boorla 12,760 Reputation points Microsoft External Staff Moderator

2025-04-25T16:44:58.7133333+00:00

@Rohith Yantrapalli

Just checking in to see if the below answer helped. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

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Chandra Boorla 12,760 Reputation points Microsoft External Staff Moderator

2025-04-25T16:44:58.7133333+00:00

@Rohith Yantrapalli

Just checking in to see if the below answer helped. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Answer 1

Chandra Boorla 12,760 Microsoft External Staff Moderator

@Rohith Yantrapalli

Thanks for raising this issue - silent failures in Synapse pipelines can definitely be frustrating, especially without any logs or error messages to go on.

Here are a few suggestions to help troubleshoot and possibly surface more information:

Check Activity-Level Error Settings

Navigate to the failing activity (Hourly_Trg in sales_extract) in Synapse Studio.

Ensure "Continue on failure" is disabled (unless intentional). If enabled, the pipeline may ignore errors.

Verify the Retry Policy: If retries are configured, ensure failures are logged after all retry attempts.

Review Diagnostic Logging

Enable Azure Monitor Logs:

Go to Synapse Workspace → Diagnostic settings → Add diagnostic setting.
Select categories: PipelineRuns, ActivityRuns, TriggerRuns.
Send logs to a Log Analytics workspace or Storage Account.

Query logs using KQL in Log Analytics to check for hidden errors.

Validate Permissions

Ensure the Synapse Managed Identity has required roles (e.g., Storage Blob Contributor) on linked services (e.g., ADLS Gen2, SQL DB).

Check if credentials (e.g., Key Vault secrets) used in the pipeline are expired or inaccessible.

Network and Connectivity

Test connectivity to dependencies (e.g., storage accounts, external APIs):

Use a Web Activity to ping endpoints.
Check firewall rules blocking outbound/inbound traffic (e.g., Azure Storage IPs allowed).

Debugging and Monitoring

Use Synapse Monitor:

Open the failed pipeline run → Check the Output or Error tab for the Hourly_Trg activity.
Look for JSON error details (e.g., failureReason, errorCode).

Enable Debug Mode:

Rerun the pipeline in debug mode to capture real-time logs.

Custom Error Handling

If the pipeline uses custom logging (e.g., Azure Functions, Logic Apps), ensure error messages are not being suppressed.

I hope this information helps. Please do let us know if you have any further queries.

Kindly consider upvoting the comment if the information provided is helpful. This can assist other community members in resolving similar issues.

Thank you.

Chandra Boorla 12,760 Reputation points Microsoft External Staff Moderator

2025-04-23T19:17:51.69+00:00

@Rohith Yantrapalli

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.
Rohith Yantrapalli 20 Reputation points

2025-04-24T07:41:23.3466667+00:00

Hi @Chandra Boorla

Thanks for the quick steps to address this issue.

After a couple of scheduled refreshes, the pipelines completed successfully without any further errors. As a temporary measure, I’ve applied a Retry configuration. However, this behaviour remains highly unusual and unexpected, and the exact root cause is still unclear - no relevant logs or diagnostics were captured in the Synapse environment.

So far, we haven’t observed the issue reoccurring, assuming it may have been an internal or transient issue on Synapse's end. Would you recommend any further steps to help identify the root cause or prevent future occurrences?

Thank You
Chandra Boorla 12,760 Reputation points Microsoft External Staff Moderator

2025-04-24T18:01:36.1966667+00:00

@Rohith Yantrapalli

Thanks for the update, and I’m glad to hear the pipelines are now completing successfully after applying the retry configuration.

You're absolutely right, the absence of logs or error messages makes this behavior quite unusual, and it does point toward a possible transient or internal issue within the Synapse environment. While transient errors can occasionally occur in managed services, it's a good idea to take a few proactive steps to guard against future recurrences and aid in root cause analysis if it does happen again:

Recommended Next Steps

Enable and Retain Diagnostic Logs (if not already done) - Ensure you’ve enabled diagnostic settings at the Synapse workspace level to send logs to Log Analytics or a Storage Account. This helps capture pipeline, activity, and trigger-level telemetry for both successful and failed runs.

Add Activity-Level Error Handling - In critical activities, consider implementing a Try-Catch pattern (especially in Data Flows) or use If Condition activities to log or handle intermittent failures gracefully.

Monitor with Alerts - Set up Log Analytics Alerts on failure patterns or unexpected status codes. Even if logs are sparse, this can help capture patterns over time.

Check for Service Health Incidents - If you suspect a transient platform issue, you can review the Azure Service Health portal for any Synapse-related incidents around the time of the failures.

I hope this information helps. If the issue still persists, please do let us know. Glad to help.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Thank you.

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Pipelines are failing is Synapse Environment without any proper error specified?

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