On 21 October 2010 14:32, MP <[email protected]> wrote: >> Maybe we could work around this by automatically changing the link for >> the stored tiles? This would also harm "friendly" projects with small >> tile-download-rates though. If it is technically possible to identify >> this application they could also be filtered out. > > But what prevents the "evil" applications to set same user agent as good ones? > Not a good idea. > This would break many things, for example the slippy map preview in > JOSM, without managing to do what is intended (stop bulk downloaders - > as if one downloader does not work, user will just pick another that > will - or wait for update to existing one) >
The tile server already automatically rate limits client connections after they have bypassed a particular rate and usage limit. Scraper apps which download huge uncached areas will run fine for a few minutes until they hit these limits after which their connections are slowed down. Within a few minutes of backing off the rate limits are removed. Technical: Large set of squid delay pools in a reverse proxy configuration. High bucket size with a low top-up rate. Regards Grant Part of OSM sysadmin team. _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
