[Bug 288868] New: Importing old kmail maildir either crashes or the result is unuseable slow

[Michael Gerdau]

https://bugs.kde.org/show_bug.cgi?id=288868

           Summary: Importing old kmail maildir either crashes or the
                    result is unuseable slow
           Product: kmail2
           Version: 4.7
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: mgd at qata.de


Version:           4.7 (using KDE 4.7.3) 
OS:                Linux

On an working openSUSE 11.4 I did a systemupgrade to 12.1. This resulted in a
catastrophe due to a completely broken migration tool from kmail to kmail2.

After several days of unsuccessful tinkering and reading lots of inet forums
about people having exactly the same probs as I had I eventually decided to
drop on this and do a fresh install. The rest deals with the problems I
encountered there.


On a freshly installed openSUSE 12.1 (stock version; KDE 4.7.2) I had tried to
import my old kmail maildir tree with all my old msgs. These are several 100k
msgs and about 2-3 GB in size.

First try the importer "vanished" for no apparent reason after being about 2/3
through. Selecting some of the imported folders to check whether they had been
properly imported took ages - I had to wait several 10s of seconds (didn't
measure the exact time - it was way too long to be workable; I'm on a RAID with
a recent quadcore processor and 16GB of RAM).

I then tried to reimport, checking "ignore dublicated msgs". This time it got
through. However the result was unworkably slow. Clicking on a mailfolder with
just a handful of msgs resulted in heavy diskload and ages of waiting.

I then decided to delete the whole akonadi DB stuff and restart from scratch.
Basically the result was unchanged. After some inet research I decided to
upgrade my KDE to the current stable released branch as of openSUSE
buildservice which currently is KDE 4.7.4.

I removed all kmail2 and akonadi configurations and started from scratch - or
so I think.

The import process still does not go though but crashes somewhere midway. Only
improvement is that the result seems to be reasonably fast in that now after a
click on a mailfolder the response is acceptably fast.

I then tried to repeat the crashed import (ignore dublicates checked) which
just stopped working for no apparent reason after a short time - the importer
window just "hang".

In light of all the other problems I find it almost neglectable that all
information about mails being read/unread/marked are completely lost during
import.

Reproducible: Always

Steps to Reproduce:
see above

Actual Results:  
The import does either crash, hang or the result is unacceptably slow.

Expected Results:  
The import should just not crash and import all messages and the result should
be workable in that it should be at least as fast as it was with the previous
kmail (without akonadi)

The whole import process takes roughly a day and severely hinders other work on
the system, not to speak about email being a core component of my daily
workflow.

>From my perspective the whole akonadi/kmail2 combo is not ready for primetime.

The migration tool is alpha or early beta at most. The importer IMO has
definitely beta status.

I wonder how kmail2 together with akonadi made it into the KDE stable branch.

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