Hello,
A while a go we reported that we were having trouble to cache
vnd.mapbox-vector-tile tiles in Geoserver[1], but we were not able to
provide the steps to reproduce the bug. After some more digging, we
finally found what causes the trouble.
Enabling the 'WMS integration' and disabling the 'explicit tiled
parameter' causes a back and forth infinite loop between Geoserver and
GWC when trying to obtain vector tiles. According to our tests, this is
what happens:
* GeoWebCache asks Geoserver for the missing tile when it's not
already cached.
* Geoserver, instead of generating the tile, asks GeoWebCache if the
tile is cached.
* GeoWebCache again asks Geoserver for the tile.
* ... infinite loop between the two services until the stacktrace is
so big it causes a StackOverflow
The bug can easily be reproduced by using Geoserver's official Docker image:
1. Run Geoserver: 'docker run -it --rm -e INSTALL_EXTENSIONS=true -e
STABLE_EXTENSIONS=vectortiles -p 8080:8080
docker.osgeo.org/geoserver:2.21.1'
2. Login to admin panel. Default credentials admin:geoserver
3. Enable 'application/vnd.mapbox-vector-tile' Tile caching for layer
tiger:tiger_roads (we are taking this as an example, but any should
cause the same)
4. Request tile to TMS:
'curl -u admin:geoserver
http://localhost:8080/geoserver/gwc/service/tms/1.0.0/tiger:tiger_roads@EPSG:4326@pbf/12/2412/2975.pbf'
The request will succeed and will return a binary output (we don't
really care about the content). So we confirm that by default the
tile generation/caching works.
5. Disable 'Explicitly require TILED Parameter' and enable 'Enable
direct integration with GeoServer WMS' under Tile Caching / Caching
Defaults
6. Clear cache for layer 'tiger:tiger_roads'. Tile layers /
'tiger:tiger_roads' / 'Empty'
7. Enable the VERBOSE_LOGGING profile
8. Ask for the same tile again
'curl -u admin:geoserver
http://localhost:8080/geoserver/gwc/service/tms/1.0.0/tiger:tiger_roads@EPSG:4326@pbf/12/2412/2975.pbf'
The request will return a 'GWC Error': '400: Problem communicating
with GeoServer' and while generate a huge stacktrace. Depending on
the PC the request may take a while.
The single tile request generates a log file of 418815lines and 34Mb. As
it's too big to send it here I uploaded it to GDrive:
https://drive.google.com/file/d/1zngWc3ga0ZCrMCr4umovzPTM6lqBoSoC/view?usp=sharing
[1] https://sourceforge.net/p/geoserver/mailman/message/37332774/
Thank you
--
*BINGEN GALARTZA IPARRAGIRRE*
magnet.coop
Santa Marina 3, Oñati (20560)
i...@magnet.coop
*www.magnet.coop*
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