[Bug 247848] New: akonadi fails syncing large collections from scratch

[Cyrille Dunant]

https://bugs.kde.org/show_bug.cgi?id=247848

           Summary: akonadi fails syncing large collections from scratch
           Product: Akonadi
           Version: 4.5
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: IMAP resource
        AssignedTo: ervin at kde.org
        ReportedBy: cyrille.dunant at gmail.com
                CC: vkrause at kde.org, kdepim-bugs at kde.org


Version:           4.5 (using Devel) 
OS:                Linux

The syncing of a large collection/directory is done (seemingly) as an atomic
operation: one never sees the directory filling up as it is synced up.

Now if the collection is large and the download unreliable/sometimes
interrupted it is impossible to finish the syncing. 

For example, I have 10000 mails on a google mail account and the sync was not
done overnight. Worse, because of the download limit of google, it was
interrupted and all that had been downloaded was not cached, and presumably has
to be downloaded again.

I have activated the offline cache option.

Reproducible: Always

Steps to Reproduce:
download a very large collection over an unreliable connection (small
interruption every half hour)

Actual Results:  
No progress in the download is apparent after many hours

Expected Results:  
download should at least be partially completed, and continued when the
server/the connection is restarted

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