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https://issues.apache.org/jira/browse/JAMES-4023?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Tellier updated JAMES-4023:
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Attachment: Screenshot from 2024-03-29 16-30-53.png
> SMTP server is blocking on the IO thread
> ----------------------------------------
>
> Key: JAMES-4023
> URL: https://issues.apache.org/jira/browse/JAMES-4023
> Project: James Server
> Issue Type: Bug
> Components: POP3Server, SMTPServer
> Affects Versions: master, 3.8.0, 3.8.1
> Reporter: Benoit Tellier
> Priority: Major
> Fix For: 3.9.0, 3.8.2
>
> Attachments: Screenshot from 2024-03-29 16-30-53.png,
> cnb-imap-29-03-2024.html
>
>
> While conducting a routine flame graph analysis [attached] I realized some
> file calls where done on the event loop [screenshot attached]
> By printing the thread that performs the enqueuing I was able to confirm this:
> {code:java}
> ENQUEUING on smtpserver-io-1
> {code}
> Blocking on the netty eventloop blocks all other concurrent requests to that
> thread and can cause significant delays by making the overall server
> irresponsive. This shall be avoided at all cost!
> By reworking slightly the Netty pipeline, and relying on the
> eventExecutorGroup for the core handler this had effectively been mitigated:
> {code:java}
> ENQUEUING on smtpserver-0
> {code}
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