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https://issues.apache.org/jira/browse/JAMES-3997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Tellier closed JAMES-3997.
---------------------------------
    Resolution: Fixed

Could be a candidate for 3.8 backport though...

If somebody in the community feels motivated.

> Netty backpressure for IMAP Fetch
> ---------------------------------
>
>                 Key: JAMES-3997
>                 URL: https://issues.apache.org/jira/browse/JAMES-3997
>             Project: James Server
>          Issue Type: Improvement
>    Affects Versions: 3.8.0, 3.8.1
>            Reporter: René Cordier
>            Priority: Major
>             Fix For: 3.9.0
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> Some OOM IMAP issues on a production environment using James have been 
> detected, regarding the method IMAP FETCH.
> We seem to do to write out:
> {code:java}
> channel.writeAndFlush()Unpooled.wrappedBuffer(buffer)); 
> {code}
>  without any checks. Making the method using intermediate buffers in a slow 
> network, potentially exploding the memory.
> Need to investigate this issue and enhance this processus, maybe by using 
> Netty backpressure instead?



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