[mapserver-dev] Expire tiles and update new after Postgres DB update using mapcache

Seth G sethg at geographika.co.uk
Sat Jul 27 12:28:24 PDT 2019


If you know the list of tiles that have expired, can't you script deleting these, and then regenerate the cache?
mapcache_seed should skip generating any existing tiles. I'm unaware of any inbuilt way of doing this. 
There is a RFC at https://mapserver.org/development/rfc/ms-rfc-122.html that may be of interest/relevance to you in the future.


twitter: @geographika

On Sat, Jul 27, 2019, at 6:52 AM, parsis presswala wrote:
> I have developed the map using MapServer and pre-generated tile using mapcache. Now I have an idea to update the database every day. As changes apply in the database only those parts should be re-render and new tile should be generated. As changes are very small and rendering all ties from start is difficult to process.
> I got expiry list of tiles by following osm2pgsql:

> osm2pgsql --append --slim --cache 1000 --multi-geometry /home/parsis/diff_file_minute.xml --number-processes 2 --hstore -d testdemo -r xml -e6-11 -o /home/parsis/expire.list

> Got list something like this:

> ` - 11/329/713
 - 8/40/91
 - 10/164/357
 - 7/29/47`
> I find another approach using render_expired <https://ircama.github.io/osm-carto-tutorials/manpage.html?url=https://rawgit.com/openstreetmap/mod_tile/master/docs/render_expired.1>, but don't know how to use it with mapcache.

> How is it possible using mapcache_seed?

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