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Posted to server-dev@james.apache.org by "René Cordier (Jira)" <se...@james.apache.org> on 2020/07/15 04:44:00 UTC
[jira] [Commented] (JAMES-3305) RabbitMQ EventBus deserialization
error handling
[ https://issues.apache.org/jira/browse/JAMES-3305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157875#comment-17157875 ]
René Cordier commented on JAMES-3305:
-------------------------------------
[https://github.com/linagora/james-project/pull/3567] contributed to add RabbitMQ eventBus deserialization error handling
> 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
> Priority: Major
>
> 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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