[dolphin] [Bug 419429] New: tags:/ url creates huge IO load and temporarily eats up all disk space during thumbnail creation

[Bernhard Scheirle]

https://bugs.kde.org/show_bug.cgi?id=419429

            Bug ID: 419429
           Summary: tags:/ url creates huge IO load and temporarily eats
                    up all disk space during thumbnail creation
           Product: dolphin
           Version: 19.12.3
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: bernhard+kde at scheirle.de
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Opening a "tags:/" url in dolphin creates huge IO load and temporarily eats up
all disk space while thumbnails are created.


STEPS TO REPRODUCE
1. Have 2 HDDs (sda and sdb) [Not sure if this is required]
   The OS and especially /tmp/ is located on sda.
   User data is on sdb.
2. Tag large files (>100MB; The larger the easier to reproduce) on sdb with a
tag containing fragments: MyTag/MySubTag
3. Open "tags:/MyTag/MySubTag/

OBSERVED RESULT
Dolphin creates new thumbnails. (Even if the thumbnails were previously already
created by opening the original file location (on sdb).)
To create the thumbnails Dolphin copies the original files to
/tmp/dolping.<xyz.part thereby creating a huge IO load and likely fills up sda
completely.
A full /tmp/ directory further then leads to all kind of other issues.

EXPECTED RESULT
* Don't copy files to /tmp/ to create thumbnails.
* Don't create new thumbnails if already created for the original file.


SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.18
KDE Plasma Version: 5.18.3
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.1
Kernel Version: 4.15.0-91-generic
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-3770 CPU @ 3.40GHz
Memory: 15,5 GiB

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