Shopware Messenger Redis: How to Fix “Could Not Acknowledge Redis Message” Errors

When Shopware uses Redis Streams as the transport for Symfony Messenger, queue processing is generally reliable and scalable. However, some installations may encounter errors similar to the following:

This error often appears when multiple Messenger workers are processing the same queue. Since the message suggests a Redis problem, troubleshooting typically begins with Redis connectivity, memory usage, or server health.

In many cases, however, the underlying issue is related to Messenger consumer configuration rather than Redis itself.

Understanding How Shopware Uses Redis Streams

Shopware relies on Symfony Messenger for asynchronous task processing. When Redis Streams is configured as the transport, messages are

1. Written to a Redis stream.
2. Assigned to a consumer group.
3. Delivered to individual consumers within that group.
4. Acknowledged after successful processing.

Redis uses consumer names to track which worker owns a message and whether that message has been successfully acknowledged.

For this mechanism to work correctly, each worker must have a unique consumer identity.

Common Symptoms

Administrators may notice one or more of the following:

• Queue workers are stopping unexpectedly
• Failed message acknowledgements
• Growing pending message counts
• Intermittent Messenger errors
• Messages are being retried unnecessarily
• Log entries containing:

The issue often becomes more visible after increasing the number of queue workers.

Why the Error Occurs

A common cause is multiple Messenger workers sharing the same Redis consumer name.

For example, a Supervisor configuration may start several worker processes:

Although four workers are running, they may all connect to Redis using the same consumer identity.

When this happens:

• Multiple workers compete for ownership of messages.
• Redis cannot reliably track which worker should acknowledge a message.
• A worker may attempt to acknowledge a message owned by another worker.
• Redis rejects the acknowledgement request.
• Shopware logs a “Could not acknowledge redis message” error.

The Correct Configuration

Each Messenger worker should use a unique consumer name.

When using Supervisor, a unique identifier can be generated from the process number:

Messenger can then use the environment variable as the consumer name:

This creates separate consumers such as:

Each worker now has clear ownership of the messages it processes.

Verifying the Fix

After assigning unique consumer names:

• Message acknowledgements are complete successfully.
• Pending messages are processed normally.
• Queue throughput improves when scaling workers.
• Messenger workers operate independently without ownership conflicts.
• “Could not acknowledge redis message” errors disappear.

Monitoring Redis Streams and Messenger logs should confirm normal queue operation.

Best Practices for Shopware Messenger and Redis

To avoid consumer-related issues:

• Use a unique consumer name for every worker process.
• Review Supervisor configurations whenever worker counts are increased.
• Monitor pending messages in Redis Streams.
• Regularly check Messenger logs for acknowledgement failures.
• Test queue processing after infrastructure changes.

These practices help ensure reliable asynchronous processing in Shopware environments using Redis Streams.

Conclusion

The “Could not acknowledge redis message” error is frequently associated with Redis Streams consumer management rather than Redis server failures. When multiple Messenger workers share the same consumer identity, message ownership conflicts can prevent successful acknowledgements.

Assigning a unique consumer name to every worker ensures that Redis can correctly track message ownership and allows Shopware’s queue system to operate reliably at scale.

Managing Redis, Symfony Messenger, and other infrastructure components is essential for reliable Shopware performance. If your team needs support with Shopware maintenance, performance optimization, or technical troubleshooting, our Shopware experts can help identify and resolve complex issues.