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https://issues.apache.org/jira/browse/JAMES-3711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Tellier closed JAMES-3711.
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Fix Version/s: 3.7.0
Resolution: Fixed
> Have a Requeue mailet that could be use in combinason with rate limiter to
> build a naive throttler
> --------------------------------------------------------------------------------------------------
>
> Key: JAMES-3711
> URL: https://issues.apache.org/jira/browse/JAMES-3711
> Project: James Server
> Issue Type: Bug
> Components: Mailet Contributions
> Reporter: Benoit Tellier
> Priority: Major
> Fix For: 3.7.0
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> - Requeue mailet allows specifying:
> - a Mail Queue name (optional, default to spool)
> - a target processor (optional, defaults to root)
> - a delay (optional, defaults to none)
> Eg:
> {code:java}
> <mailet matcher="All" class="Requeue">
> <queue>spool</spool>
> <processor>transport</processor>
> <delay>2h</delay>
> </mailet>
> {code}
> This is a generic enough functionality that I think it can make sense by
> itself.
> Combined with rate limiting mailet, it allows for a (very basic) throtler:
> smooth the traffic to the expected rate. Note that this is a naive approach:
> if you have a large amout of emails (say N) submitted at once, you would need
> O(N) requeues to eventually send all your mails, where the constant is the
> number of mail allowed over the time window. So this gives an overall
> complexity of O(N2), while careful planning could achieve this in O(N).
> Eg: throttle senders to 10 mails per hour, smoothing the traffic as required.
> {code:java}
> <processor name="root">
> <mailet matcher="All" class="PerSenderRateLimit">
> <redisURL>redis://localhost:6379</redisURL>
> <keyPrefix>myPrefix</keyPrefix>
> <duration>1h</duration>
> <count>10</count>
> </mailet>
> <!-- Go to transport for instance -->
> </processor>
> <processor name="root">
> <mailet matcher="All" class="Requeue">
> <queue>spool</spool>
> <processor>root</processor>
> <delay>1h</delay>
> </mailet>
> </processor>
> {code}
> *TODO:*
> - [ ] Write the JIRA ticket for throttling
> - [ ] Write the Requeue mailet (`server/mailet/mailets`)
> - [ ] And finally provide documentation and config samples for this naive
> throttler
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