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

[Minh Nguyễn]

1ec5 left a comment (openstreetmap/openstreetmap-website#7054)

/map includes any relation that has a member within the requested bounding box, including the relation’s complete members. You’re rerequesting highways all across Switzerland just because the E60 and several intercity bus routes run through there. That’s still a lot of ways and nodes in addition to the relations.

The most recent time I hit openstreetmap-cgimap’s bandwidth limit was a couple months ago attempting to move a GNIS-imported POI about 30 kilometers in iD, panning by screenfuls pretty rapidly [along a major highway route](https://www.openstreetmap.org/way/961140460) in an area with very dense building coverage. (I used to have an amazing workaround to avoid any panning at all, but it no longer works.) The rate limiting began about 20 kilometers into it. I ended up having to wait a bit between each screenful. It didn’t occur to me that the highway route might’ve been the issue (along with several intercity bus routes that follow the highway route).

It’s a lot easier to hit the limit in OpenHistoricalMap, which uses relations much more heavily. Fantastically dense and complex boundary relation coverage (like in San José, more than a thousand times of what’s in OSM) forced us to increase openstreetmap-cgimap’s limits in OpenHistoricalMap/issues#860. That mitigated the rate limit for now, but it’s still a poor experience for anyone editing on a less powerful computer.

If the complete relations are driving rate limits in OSM, then I’m picturing a bandwidth optimization in the form of an option on /map that fetches all the map data in the bounding box, including the parent relations, but not recursively. Then an editor could decide to multifetch the relations by ID in a separate request as necessary. The downside would be additional requests and possibly more work on the server side.

(Reposted because I forgot that /map is actually recursive.)

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