[Tile-serving] [openstreetmap/mod_tile] Serve cache files permanently? (#186)

[Sean Reifschneider]

In my testing, "ModTileBulkMode On" does seem to cause it to stop requesting re-rendering of tiles that have already been rendered.  In my situation, we periodically pull down the data from OSM and then deploy it to map tile servers.  That data is never updated in place, we would spin up a new box when we update OSM data.  A process goes through after the spin-up and renders all the tiles (we are covering a smallish geographic area).

With "ModTileBulkMode Off", going back and visiting these boxes after a 2 week vacation, in my testing environment, produced extremely slow page loads.  Calling my render script didn't produce any new tile files.  Once I enabled BulkMode, page loads were much faster.

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