[Akonadi] [Bug 338658] GMail, Novell Groupwise, other IMAP: "Multiple merge candidates, aborting"

[Matthias Kretz]

https://bugs.kde.org/show_bug.cgi?id=338658

Matthias Kretz <kretz at kde.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kretz at kde.org

--- Comment #121 from Matthias Kretz <kretz at kde.org> ---
I'm fed up with wiping my Akonadi data every other month so I'm trying to once
again to understand the cause or find a workaround.

Anyway, I was following the SQL hints on debugging the state of my Akonadi data
and found three instances of duplicated (well, rather "multiplicated")
pimitemtable.remoteIds, on the order of hundreds of different pimitemtable.ids.
I then tried to find the corresponding data in parttable via INNER JOIN
parttable ON pimitemtable.id = parttable.pimItemId. Interestingly enough
there's a single pimitemtable.id per pimitemtable.remoteId left (with three
different parttable.id per pimitemtable.id, which seems to be correct for
normal entries). So it seems there are stale entries in pimitemtable. The query

SELECT pimitemtable.*, collectiontable.name FROM pimitemtable
INNER JOIN collectiontable ON pimitemtable.collectionId = collectiontable.id
LEFT JOIN parttable ON pimitemtable.id = parttable.pimItemId
WHERE parttable.id IS NULL

lists the same remoteIds that the query looking for dups found, minus the ones
that have a match in parttable. Useful information: there are no additional
stale entries in pimitemtable than the dups.

Next step, I tried to remove the stale entries in pimitemtable with the
following query:

DELETE pimitemtable FROM pimitemtable
LEFT JOIN parttable ON pimitemtable.id = parttable.pimItemId
WHERE parttable.id IS NULL

However, the query hangs akonadiconsole for ~1 minute and then returns "Lock
wait timeout exceeded; try restarting transaction QMYSQL: Unable to execute
query". An `akonadictl restart` in this case did the trick and the query then
got through. All dups gone. In any case the hangs on reading mails in KMail
that I experienced since yesterday are gone. Let's see whether it helps.

Maybe the DELETE query is a useful addition to `akonadictl fsck` until the root
cause can be fixed?

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