Greetings - I’m running GeoServer 2.7, and have to date successfully downloaded 
an .mbtiles version of a raster file via Layer Preview only once—which suggests 
that all .mbtiles extensions are correctly installed, but something else is 
going on. In all other cases I get a 502 error (after one minute), which I 
assume is some form of timeout in this case. 

When I look at the log file, it appears that GeoServer is generating a series 
of 256x256 tiles, and the process simply takes too long to complete prior to 
timeout (one log download included 324 instances, taking place over two 
minutes). Is the problem simply that it is taking GeoServer too long to 
generate the .mbtiles file, and if so, what do you recommend? (I did e.g. purge 
GeoServer memory first via Server Status panel.) 

Btw, if you’re interested why we are doing this, we’re looking for a workaround 
for TileMill (no longer supported) to export layers in .mbtiles format for 
upload to Fulcrum survey app as offline base layers.

Regards,

Jim P.
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