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https://issues.apache.org/jira/browse/JAMES-3746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17521453#comment-17521453
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Tran Hong Quan commented on JAMES-3746:
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> See attached screenshot.
Oops, no screenshot is available. Can you share it again?
> IDLE mailbox listener leak
> --------------------------
>
> Key: JAMES-3746
> URL: https://issues.apache.org/jira/browse/JAMES-3746
> Project: James Server
> Issue Type: Improvement
> Components: IMAPServer, mailbox
> Affects Versions: 3.7.0
> Reporter: Benoit Tellier
> Priority: Major
> Fix For: master, 3.8.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> h3. What
> On a production instance running James 3.7.0 I have 2900 + IDLE listeners for
> only 58 IMAP connections. Something is clearly wrong here!
> See attached screenshot.
> A code audit showed that the listener associated with IMAP IDLE is only
> removed when the use inputs "DONE" to close the IDLE command.
> If the connection is unexpectedly dropped then the listener is never removed!
> This is even more critical that this keeps the UID-MSN mapping in memory
> forver (!).
> h3. The fix
> This is fixed on master (upcoming 3.8.0) as we no longer put a distinct
> registration for IMAP IDLE but reuse the connection for the Selected mailbox.
> Selected mailbox is cleaned up upon disconnection, deselection etc.. so we
> don't need to worry.
> Also it puts less of a churn on RabbitMQ component as IDLE becomes
> essentially a hook on the SelectedMailboxImpl listener.
> I propose to backport this to 3.7.1...
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