[Akonadi] [Bug 472282] Kolab Now reports too many open connections

[Andreas Cord-Landwehr]

https://bugs.kde.org/show_bug.cgi?id=472282

--- Comment #2 from Andreas Cord-Landwehr <cordlandwehr at kde.org> ---
After some more debug outputs, essentially uncommenting the GOT/SENT debug
lines in getmetadatajob.cpp and increasing the debug level to debug for kimap,
I am very sure that the Kolab server behaves in a way that some calls to
"GETMETADATA (DEPTH infinity)" never are answered and thus the socket timeout
is hit. What is quite interesting, in the same IMAP session the exact same
call, eg

C: A000008 GETMETADATA (DEPTH infinity) "KDE/Community" (/shared)
S: * METADATA KDE/Community ( /shared/vendor/cmu/cyrus-imapd/server
imapb036.mykolab.com )
S: A000008 OK Completed

at one point succeeds and a few seconds later

C: A000015 GETMETADATA (DEPTH infinity) "KDE/Community" (/shared)

never is answered (I modified getmetadatajob such that timeout is set to
infinity and now after waiting 15 minutes, I am very sure that the sever never
will answer).
@heinz, do you see the same behavior?
With my limited IMAP knowledge, as far as I can see, here is not much that can
be done on the client Akonadi side other than some crude hacks that retry the
getmetadatajob once a socket timeout is reached instead of tearing down the
full connection.

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