[openstreetmap/openstreetmap-website] Bandwidth limit has become trivial to hit (Issue #7054)

[Simon Poole]

simonpoole left a comment (openstreetmap/openstreetmap-website#7054)

I've given both the relevant rails and c++ code a quick look, and it seems as if it would actually be a net gain if the you could provide a list of element ids + version ((typically ways) to not include in the map call output, and more importantly not to recursively include any parent relations of those elements (you probably don't want to do this for relations themselves). This would allow the caller to avoid multiple downloads of the same data.

Example use case (I just spent half an hour getting a 509 every couple of seconds doing exactly this): following a way that is a member of multiple boundary relations. After the initial download the editor/downloader could exclude the way and just download the literally handful of nodes that are actually new when panning along the way.   

The, downside of this is naturally that changes to the way and parent relations wouldn't get "automatically" downloaded and there would have to be logic in the client to now and then download all the data again, but that could be timeout driven or similar. In any case it would be the callers responsibility to maintain a consistent state of the data.

Pinging @mmd-osm and @tyrasd for their take on it.



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