Ryan

@YonoloX , I ran into this issue too. An [issue](https://github.com/celery/celery/issues/4525#issuecomment-566503932) on the celery repo suggested running the celery worker with a thread pool: ```bash celery worker -P threads ```

Same issue, but for connecting to `mssql` from linux. Tested PostgreSQL DB connection/queries and that appears to work.

I just learned about terracotta (really awesome tool!) and this feature would be great. I frequently have a collection of rasters that are tiled, and would like to serve them...

There is a [vrt module](https://rasterio.readthedocs.io/en/stable/api/rasterio.vrt.html) in rasterio, for in-memory vrt.

@dionhaefner , ah I see. I've created VRT's with `gdalbuildvrt` and specified rasters on S3 making sure `relativeToVRT="0"` is set and that the source filename includes `/vsis3/...`. Do you think...

Okay, gave it a shot, but it didn't work. Here was my setup. I already had rasters on S3 that were optimized via `terracotta optimize-rasters`. Build list to build vrt:...

@j08lue I can't provide the exact VRT, contains private info. But here is an example VRT that is pretty much the same. It was built with plain `gdalbuildvrt`: ```xml PROJCS["NAD83(2011)...

@dionhaefner and @j08lue, something strange happened and it actually did work... However, it took probably 30min before the tiles were rendered. I tried to retest today, saw that nothing was...

@dionhaefner , it loaded faster than the tiles on the map, but still slower than serving a large geotiff.

@dionhaefner, I'm not sure I follow. Based on the groups.io post the workflow is: 1. Create COGs for individual rasters via `terracotta optimize-rasters` 2. Create VRT for rasters via `gdalbuildvrt`...