| mszwarc | |
| Mar 30 2026, 10:34 AM |
| F74463593: image.png | |
| Mar 30 2026, 10:34 AM |
| F74463392: image.png | |
| Mar 30 2026, 10:34 AM |
As part of a routine check of the MediaModeration dashboard in Grafana, I noticed that since the DC switchover on March 25, the time needed for image transformations increased (the "php" stat is now at 8.7s for p75).
Given that PHP file transform is used only on errors in Thumbor response, the issue may stem from increase in error responses from Thumbor (filtered out 200 and 404):
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| Change $wgMediaModerationThumbnailWidth to 250 | mediawiki/extensions/MediaModeration | master | +8 -8 |
I think you're requesting the 330px standard size. Can you switch to 500px instead? That is the size that is being advertised as 2x for default thumb size and hit ratio in swift should be much higher than the other standard size (330px)
note that thumbnails don't get replicated across swift clusters in different DCs, so changes to runtime after the switchover is actually expected.
We could, but ideally we wouldn't want to unless necessary as the larger the thumbnail the more likely it would be too large for PhotoDNA (they impose a upper limit on the file height)
Another good one is 250px (default thumb size, 1x), you could try to prefer those instead if height is large?
Change #1287869 had a related patch set uploaded (by Dreamy Jazz; author: Dreamy Jazz):
[mediawiki/extensions/MediaModeration@master] Change $wgMediaModerationThumbnailWidth to 250
Change #1287869 merged by jenkins-bot:
[mediawiki/extensions/MediaModeration@master] Change $wgMediaModerationThumbnailWidth to 250