René Cordier created JAMES-3305:
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Summary: RabbitMQ EventBus deserialization error handling
Key: JAMES-3305
URL: https://issues.apache.org/jira/browse/JAMES-3305
Project: James Server
Issue Type: Bug
Reporter: René Cordier
h2. Why ?
https://issues.apache.org/jira/browse/JAMES-3290 proved a non deserializable
message caused the entire MailQueue processing to crash.
[https://github.com/linagora/james-project/pull/3532] solved this by doing an
explicit nack on such messages, relying on RabbitMQ dead-letter exchanges to
not loose data. The message is thus effectively ignored.
Following this, we need to further investigate RabbitMQ related code and
evaluate if there is similar issues.
A quick study proved the EventBus is subject to the same class of bugs.
h2. Acceptance criteria
* If a message cannot be deserialized, following legitimate events can still
be processed.
* Discarded messages are stored in a dead-letter queue and not lost
Note that both group registration and key registration needs to be tested:
Regarding key registration, dropping events is OK.
h2. Definition of done
* Write tests to reproduce the issue and the expected behaviour
* Implement the fix leveraging dead-letter and nack
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