We are having an issue with very slow (>60s) generation of Vector tiles (mapbox) via open layers TMS calls. This can be reproduced through the geoserver web interface on the "Tile Layers" page. The same tiles seem to be generated very quickly in the PNG format.
We are running geoserver 2.14 on linux with 2GB heap. The vector tile generation appears to create a lot of garbage - so much that sometimes "OutOfMemory: heap" or "OutOfMemory: gc time exceeded" messages appear in the log. Steps to reproduce: 1. Install geoserver 2.14 and Vector tile output extension 2. Download shapefile "Australia (AUS) ASGS Ed 2016 Digital Boundaries in ESRI Shapefile Format" from web site: http://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/1270.0.55.001July%202016?OpenDocument 3. Load above shapefile into a datastore & enable "mapbox" tile output format. 4. Navigate to the "Tile Layers" web page in geoserver. For the layer created from the above shapefile, choose "mapbox" in the Preview dropdown. 5. Preview will display albeit extremely slowly. 6. You may need to restart geoserver. 7. Perform step 4 above instead choosing "png" in Preview dropdown. 8. Preview displays instantly. Any ideas?
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