[Akonadi] [Bug 283682] KMail duplicates filtered messages

[Hussam Al-Tayeb]

https://bugs.kde.org/show_bug.cgi?id=283682

--- Comment #90 from Hussam Al-Tayeb <hussam at visp.net.lb> ---
On Monday 18 August 2014 12:08:03 you wrote:
> https://bugs.kde.org/show_bug.cgi?id=283682
> 
> mau <b-misc at gmx.ch> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
> CC|                            |b-misc at gmx.ch
> 
> --- Comment #89 from mau <b-misc at gmx.ch> ---
> (In reply to Joachim Wagner from comment #80)
> 
> > The bug seems to be triggered by something that doesn't happen very often.
> > I've been using kmail in kontact 4.11.5 for 8 days without problems and
> > now
> > just got hit by this bug.
> > 
> > While this report is not for the most recent version, the following
> > observations may help the developers to reproduce the bug. Like other bug
> > reporters above, I cannot attach akonida debug log files as they contain
> > confidential information.
> > 
> > Setup:
> >  * fresh OpenSUSE 13.1 with default updates (kmail/kontact 4.11.5)
> >  * fresh home directory
> >  * pop3 account connected to inbox
> >  * approximately 80 destination folders under "Local Folders"
> >  * no automatic filters defined
> >  * manually moving e-mails to destination folders
> >  * often using the "Search" input field over the message list and
> >  selecting
> > 
> > multiple messages (shift + left click or ctrl + left click) to move
> > multiple messages in one go
> > 
> > Observation:
> >  * in my case, the problem seems to be related to a specific local
> > 
> > destination folder (it was newly created just before the bug was observed,
> > let's call this folder "A") as the moved message doesn't re-appear as a
> > duplicate in the inbox if I move it to a different destination folder
> > (let's call it "B") and press F5
> > 
> >  * if I move the message from folder B to folder A, it is still duplicated
> > 
> > in folder B (after pressing F5) but not in the inbox
> > 
> >  * if I create a new local folder "C", move the message from B to C and
> > 
> > press F5, everything is normal
> > 
> >  * however, if I create "C2" under the A or the parent of A (which had
> >  been
> > 
> > created just seconds before A) and move a message to it, duplication
> > occurs
> > 
> > Workaround 1:
> >  * the "copy first, then delete with ctrl-del" trick worked for me
> > 
> > Workaround 2:
> >  * create a new folder "A-Parent-2" and subfolder "A2"
> >  * move message from A to A2
> >  * press F5 (no duplicates should re-appear in A)
> >  * select A2 and run "Folder - Remove Duplicate Messages"
> >  * delete empty folders A and A-Parent
> >  * rename A2 to A  and A-Parent-2 to A-Parent
> > 
> > JJ
> 
> This might have the same reason than something I observed just this weekend:
> I added a new folder to my local folders and it took several seconds until
> it was shown. Afterwards I manually moved messages to this new folder. The
> showed up correctly in KMail, but no in the corresponding folder on my disk
> (.local/share/local-mail/...) so they seem to stay in the akonadi cache
> forever. Just a second after trying to move them the reappear in the
> original folder. The problem didn't show up with another folder I created.
> So it looks like the main problem being a folder not being created
> correctly.

That's one of the symptoms but not the only problem. I have cleared the 
akonadi cache more than once. So non existing emails/folders don't show up in 
clean akonadi folders. 
Putting emails in non existing folders will probably cause data loss by the 
way so be careful.

There are many issues here:
1) emails get filtered twice for some reason and thus appearing twice in 
akonadi database.
2) some race condition in updating the akonadi database because on occasions, 
the extra copy only appears for a split second then immediately disappears.
3) possibly many other reasons.

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