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https://issues.apache.org/jira/browse/JAMES-3803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17578353#comment-17578353
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Benoit Tellier commented on JAMES-3803:
---------------------------------------

You encouter issues with ActiveMQ, right?

Can you confirm the following symptoms: Upon massive load, RemoteDelivery stops 
making progress?

Can you confirm the words "thread starvation" would summarize the technical 
problem at hand?

(Just to confirm I understand your problem correctly...)

What are technical solutions you would propose?

> DeliveryRunnable blocks email in BoundedElasticScheduler-queue if running out 
> of threads
> ----------------------------------------------------------------------------------------
>
>                 Key: JAMES-3803
>                 URL: https://issues.apache.org/jira/browse/JAMES-3803
>             Project: James Server
>          Issue Type: Bug
>          Components: Mailet Contributions
>    Affects Versions: 3.7.0, 3.8.0
>            Reporter: Adrian Bucher
>            Priority: Major
>
> The DeliveryRunnable does use the same BoundedElasticScheduler (ThreadPool) 
> for dequeuing the messages (long running thread), and processing (delivering) 
> them, if lots of messages are dequeued and the BoundedElasticScheduler starts 
> to queue them, the one queueing behind the dequeuing - long running thread 
> are never processed nor delivered.
>  
> Messages are still visible in the embedded activemq delivery queues, a 
> restart of the james will process them, as they will be reacknoledged by the 
> dequeuer.
>  
>  



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