On Sun, Nov 11, 2018 at 9:45 AM Gandalf Corvotempesta <[email protected]> wrote: > > Il giorno mer 3 ott 2018 alle ore 23:19 Guillaume Lederrey > <[email protected]> ha scritto: > > > > Hello ! > > > > I'm working on the maps infrastructure for Wikimedia Maps. As guessed > > by Eugene, we don't pregenerate tiles. You can find some info on our > > infrastructure on wikitech [1] (as always, documentation should be > > better than it is). > > Hi. > Sorry for the late reply and sorry to reach you in private, but I have some > questions that I prefere to not make public.
It looks like this was a fail :) But I think you removed private infos. Please double check. > > We generate vector tiles that we store in Cassandra, regenerating > > those vector tiles when we import changes from OSM. Raster tiles > > (.png) are generated on the fly from the vector tiles and cached by > > Varnish. That rasterization process is cheap, so some level of cache > > miss are not an issue. That being said, please don't try to download > > all our tiles by iterating over them! > > Ok. > > > We don't provide dumps of our vector tiles either, as this is not that > > helpful, since you would still have to build the rendering > > infrastructure. At that point, you're probably better off building the > > full stack. > > What do you use to build the vector tiles ? We are using our own stack (Kartotherian [1]), which is based on mapnik [2]. There are a number of other alternatives possible. > Do you directly start for OSM dumps ? Yes, we start from OSM dumps, that we load in a postgres database. We update that dump daily. > What we are looking for is something pre-generated so that we don't > have to extract the whole OSM dump (we don't have enough computing > power to parse that huge file). It would be ok, for us, to have an updated > mbtiles that will be rendered and cached on-the-fly (we already have tried > that with success, but we are unable to find an updated mbtiles dump > and, as wrote above, we are unable to generate that dumps on own own) > > Options that might work for you: > > > > * Have a proxy on your side that would cache our tiles. Depending on > > your access patterns and the cache duration, this might be enough. > > We also tried that by using cloudflare (keep the following private): > > $ curl -I > https://thumbnails.take2me.it/w_256/h_256/url/https://maps.wikimedia.org/osm-intl/12/2191/1490.png > HTTP/2 200 > date: Sun, 11 Nov 2018 08:32:10 GMT > content-type: image/jpeg > content-length: 15128 > set-cookie: __cfduid=d44f565b88a285b2334ea1699eddca8461541925130; > expires=Mon, 11-Nov-19 08:32:10 GMT; path=/; domain=.take2me.it; > HttpOnly > cache-control: max-age=31536000, public > expires: Mon, 11 Nov 2019 08:31:49 GMT > last-modified: Sun, 11 Nov 2018 08:31:49 GMT > cf-cache-status: HIT > expect-ct: max-age=604800, > report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"; > server: cloudflare > cf-ray: 477f68222d554334-MXP > > as you can see, it's a cache hit (1 year) from cloudflare, so that > tile would be fetched from cloudflare and not from your server. > Probably, by respecting your actual cache expire (1day) we can have an > always updated map. > > How much time do you need to update your maps with updated data from > OSM ? 1 day ? 1 Month? Just to know... At the moment, we are updating every 2 days. We'd like to increase this frequency, but we need some work on our side to make that happen. > By caching your tiles has some advantages (almost-zero infrastructure > on our side) but also some disadvantage: we can't change the style. > Any suggestion on how to generate raster tiles (are much faster to > elaborate than vectors, on some smartphones) without having to > generate the mbtiles from raw OSM data ? Are wrote above, we can't > handle that huge file and the only MBTiles I have found is 1 year old, > in example: > https://openmaptiles.com/downloads/tileset/osm/europe/albania/?usage=education > > So, to recap: we are able to cache your tiles on our side, but we > would like to generate our own raster tiles. We are able to generate > raster tiles on our own, starting from a pre-computed mbtiles, but > that file is outdated. How can we generate (or download) an updated > mbtiles > without using the whole OSM dump? One of the problem is that we already apply some style based decisions when generating our vector tiles. For example, we already filter out features that will not be rendered at some zoom levels. So basing a style on our vector tiles will limit you in what you can render. Overall, those vector tiles are an implementation detail, coupled to our style and not meant to be reused. The format is likely to change without warning, which would break whatever integration you might have. If you need your own style, are limited on resources and don't want to rely on our raster tiles, I'm not sure what the solution could be. There are a few maps provider that will take care of the infrastructure for you and let you provide your own style. But that's not really our mission. We provide maps with the goal of having them integrate into the various Wikipedia projects. You are very welcomed to reuse those maps if they work for you. But we're not a general purpose maps provider. > Another thing to keep private: > we are using your maps on our procution site. If I tell you the > referral, could you please set that as whitelist > (or at least, warn me before any suspensions ? We don't want to see > our website down because you dropped our > access to your maps) As long as you follow the Maps Terms of Use [3], we should not have any reason to block you. We always reserve the right to block any traffic that we see as abusive or that might be a risk to the stability of our infrastructure. But we will make reasonable efforts to contact you in case of trouble. > Thank you in advance > Alessandro. > > _______________________________________________ > Maps-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/maps-l [1] https://github.com/kartotherian/kartotherian [2] https://mapnik.org/ [3] https://foundation.wikimedia.org/wiki/Maps_Terms_of_Use -- Guillaume Lederrey Operations Engineer, Search Platform Wikimedia Foundation UTC+1 / CET _______________________________________________ Maps-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/maps-l
