[jira] [Commented] (JAMES-3067) Allowed From headers recursion

["Gautier DI FOLCO (Jira)" <se...@james.apache.org>]

    [ https://issues.apache.org/jira/browse/JAMES-3067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17038222#comment-17038222 ] 

Gautier DI FOLCO commented on JAMES-3067:
-----------------------------------------

Regarding the solutions, they have major drawbacks:

 
 * "Have a parameterized number of recursions, doing multiple queries on the current scheme"

The number of queries can easily explode, overloading Cassandra

 
 * "Have a specific projection maintaining all the connected aliases"

Numerous concurrency issues: if you have the following scheme:
{code:java}
alias2 -> alias1 -> alias0 -> user{code}
The projection might look like
{code:java}
(user, [alias0, alias1, alias2]){code}
Dropping *alias0* will not result in dropping it from the projection, you will also drop *alias1* and *alias2*.

It will requires a strong coherency.

If we want to go in this direction, we will have to implement it with event sourcing.

> Allowed From headers recursion
> ------------------------------
>
>                 Key: JAMES-3067
>                 URL: https://issues.apache.org/jira/browse/JAMES-3067
>             Project: James Server
>          Issue Type: Improvement
>          Components: JMAP, SMTPServer
>    Affects Versions: 3.5.0
>            Reporter: Gautier DI FOLCO
>            Assignee: Antoine Duprat
>            Priority: Minor
>
> In order to go further than the JAMES-3032 we need to go a recursion-level further.
> They are two propositions now:
>  * Have a parameterized number of recursions, doing multiple queries on the current scheme
>  * Have a specific projection maintaining all the connected aliases
> We should discuss it



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