[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add grouped-linemerge generalization (PR #2482)

[Jochen Topf]

joto left a comment (osm2pgsql-dev/osm2pgsql#2482)

Imagico is certainly right when he says that we need to look into possible problems with the unbound merging. I wouldn't be overly concerned, there are other possibilities for DOS attacks in the existing rendering infrastructure, but we should look at the details. There are possible mitigations that will probably not affect normal use, for one thing we can make sure the merging is bounded somewhere. We could figure out the largest number of highway ways merged with this approach and build a limit a bit larger than this into the SQL query. We can also limit the number of expired tiles that we allow for each run. Or fall back to a complete re-merging of all ways planet wide (which we know takes only 20 minutes) if the number of tiles becomes too large. And we can certainly test this more, let it run on a test machine for a few weeks, see if we find any problems and so on. Its probably best to test not this on OSM Carto, but something a bit less critical.

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