Thomas Ineichen schrieb:
Looking at Zoom 12: http://www.openstreetmap.org/?lat=49.4592&lon=10.9644&zoom=12&la...
Do we really need a weekly update on that zoom? What you can see is:
- main streets (secondary and up) and trains
- forests and fields
- names of villages and cities
IMHO those things don't change often enough to let them jam the queue. Rendering them once a month would be ok.
I think in countries like Germany there will be not often such large changes in this zoom level, but I believe in other areas it's possible to be the first mapper on a motorway. So this differences should we have in mind but I believe a montly update should be enough for this zoom-levels. We can adjust it so that the server has enough to do. For the database I'm glad that we have updates each minute because we use this database also for other tools.
Secondly: Is it correct, that tiles never get deleted? So every tile gets rerendered according to the timetable, no matter if it was requested from a user during that period or not? So maybe a deletion strategy would be handy..
It's true that we not deleting tiles in the moment. This seems only necessary if the harddisks will be nearly full (In the moment we use 68% of the /osm-space[1]). So we have some months to think about a good strategy. If necessary, I would delete rare used z=16-18 tiles (reasons: cheap to render, a lot of tiles, improbable that somebody else need it).