[jira] [Created] (JAMES-3291) Badly formatted mailqueue causes RabbitMQMailQueue to crash

["Benoit Tellier (Jira)" <se...@james.apache.org>]

Benoit Tellier created JAMES-3291:
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             Summary: Badly formatted mailqueue causes RabbitMQMailQueue to crash
                 Key: JAMES-3291
                 URL: https://issues.apache.org/jira/browse/JAMES-3291
             Project: James Server
          Issue Type: New Feature
          Components: Queue, rabbitmq
    Affects Versions: master, 3.5.0
            Reporter: Benoit Tellier


## Reproduction steps: 

Given a bad payload published on the mailQueue exchange
Then the dequeuer will crash and stop any following dequeuing processing

## Consequences:

This can be leveraged to knock down mail reception given only the right to publish messages to RabbitMQ.

This can generate problems to users when upgrading with non-empty mailqueue upon MailReferenceDTO changes

## Alternatives

To not be crashing, we actually need to handle the deserialization exception.

Dropping the message would be a quick fix, but could result in data loss.

A better alternative would be to leverage a dead-letter queue in order to enable to not abort processing, while keeping track of the failure, and allowing to resume its processing.

## Related issues

We are considering improving the reliability of the distributed mailqueue component, and allow to drop all RabbitMQ content. To recover from such a situation, non-dequeued emails would be tracked using the Cassandra browsing projection, and requeued in a newly provisionned rabbitMQ.

Given the ability to re-generate non - dequeued entries, dropping invalid rabbitMQ messages could be acceptable, as the admins will have the right tools to re-generate legitimate traffic.



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