On 11/25/2013 4:39 PM, Rahkonen Jukka wrote:
Eichner, Andreas wrote:
Hi James,
to send the request to the source if it is beyond the maxzoom value.
Is
there a way to do this?
Surely not. I think you misunderstood what a cache is and how it works.
You should use mapcache_seed in delete mode to throttle the cache size.
Of course it would be great if mapcache would itself gather statistics
and control the cache but that would introduce overhead and serious
problems with some cache types (especially the popular "disk" type).
I wouldn't be so strict. Caching only at small scale and passing requests at
large scales directly towards the backend WMS is a reasonable scenario. At
least we are happy with doing that with GeoWebCache and we would do the same
with MapCache if it was possible. We have some frequently updated,
heavy-to-render vector layers and instead of playing a game with building
optimized, simplified, scale dependent group layers it is sometimes relaxing to
cache the small scale tiles and let queries at large scale go directly to WMS
without caching the tiles at all. Details do not show at small scales so it is
not so important to refresh the cache very often. At large scales we can trust
that data comes always fresh from the WMS.
I am not here for advertizing GWC but sometimes it is useful to make
comparisons. GWC has also implemented disk quota system -- the only supported
cache type for GWC, unfortunately (one of the reasons why I use also MapCache)
http://geowebcache.org/docs/current/configuration/diskquotas.html
-Jukka Rahkonen-
Jukka's correct this would be a nice enhancement to mapcache. Can
someone create an enhancement request for these features so they do not
get lost.
Thanks,
-Steve W
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