imap clients say i have 4K messages but spool has 12894 files

[Ian Willis]

Hi Brian,

The answer to your question is that yes, UID appears to correlate with
the message file name. 
At a guess something appears significantly awry.

To resolve the immediate issue.
Have you tried create a separate mail user. Copy your existing message
over via imap to the new folder. 
Delete and expunge the original mailbox and recreate, recopy.

In the longer term I would be tempted to move to a newer version of
cyrus or if you have the patience closely monitor the file-system to
debug how this is occurring.

Kind Regards 
Ian

-----Original Message-----
From: Brian J. Murrell <brian at interlinx.bc.ca>
To: info-cyrus at lists.andrew.cmu.edu
Subject: Re: imap clients say i have 4K messages but spool has 12894
files
Date: Mon, 01 Jun 2020 21:45:42 -0400

On Tue, 2020-05-26 at 09:33 -0400, Brian J. Murrell wrote:
Hi.
Every IMAP client I query my cyrus imapd 2.4.17 server with says
Ihave~4K messages in my INBOX.  However when I do a listing
of/var/spool/imap/b/user/brian/ it shows almost 13K files.
None of these include messages which have been deleted but
notexpunged.  I manually expunge my mailbox many times per day.
If I'm understanding mbexamine's output correctly, I have files
ondiskthat are not being displayed by mbexmine.  My understanding
ofmbexamine's output is that on a line formatted as such:
000001> UID:00089183   INT_DATE:[redacted]
SENTDATE:[redacted]SIZE:1537  
that the 00089183 is the reference to the file on the spool
in/var/spool/imap/b/user/brian/89183.

Is that correct?  If so, I definitely have files on the disk
whicharenot found in any "000001> UID" line from mbexamine.  ~9600 of
them. That seems to make up the difference between what an IMAP client
seesand how many files are on disk.
I also have multiple occurrences of the same "000001> UID:" and
wherethere are no matching files on the disk.  Should that be possible?
So how come the huge discrepancies and how do I reconcile them?
No other thoughts on how I can reconcile this gross discrepancy?
Ultimately I have an IMAP spool that is growing without bound due
tomessages continuing to live on the spool beyond their life in the
indexand getting orphaned.
Cheers,b.

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