[Digikam-devel] [digikam] [Bug 365354] New: git master 2016-07-11: Application crash on scanning for faces in large picture set.

[Evert Vorster via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=365354

            Bug ID: 365354
           Summary: git master 2016-07-11: Application crash on scanning
                    for faces in large picture set.
           Product: digikam
           Version: 5.0.0
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Database
          Assignee: digikam-devel at kde.org
          Reporter: evert.vorster at yandex.com

I have a fairly large collection of photos. In this case, there are 32,000
pictures, taking up about 160Gb of disk space. Recently I have tried to scan
for faces through this database, and have discovered a couple of small bugs. 

This specific bug seems to be related to the size of the dataset that I am
scanning through. 
When I use MySQL as a backend, I get the error message "MySQL database has gone
away", and when I use the internal SQlite I get the error message that is
attached at roughly the same point through the dataset, at about picture 8000,
(25%) with just over 1000 faces recognized. 

>From what I read online, this MySQL message means that either the database has
timed out, (no likely since we are writing to it the whole time), or that the
packet provided is too big. 

>From the Error message in the SQLite failure, it would appear as if that
message is indeed quite excessive. I will try now with a larger message size
set in MySQL, and see if I can use that as a workaround. However, as my picture
collection is not THAT massive as compared to professional photographers,
someone else will run into this issue sooner than later. 

Reproducible: Always

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