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https://issues.apache.org/jira/browse/JAMES-3067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17038883#comment-17038883
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Benoit Tellier commented on JAMES-3067:
---------------------------------------

> All the question is here. From the examples I know there are more aliases 
> than users. So can we consider this a tiny dataset?

I'm expecting aliases of aliases to be rare.

Actualy, if you ingore domain mappings the complexity is O(A) where A is the 
number of alias.

Why? Without a loop you will perform one additional read per alias (to check if 
it has itself an alias).

Then if you have a loop you wil perform maximum STEP\*A lookups which is 
bounded and proportional to A.

Then the complexity of domain mappings (D), I have to check D times each alias. 
Brings a complexity of *O(A\*D)*.

Nothing to be  affraid of as far as I know.

> 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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