[Tilecache] Duplicate WMS request sent to underlying WMS server

Shawn Oatley shawn at niagarafalls.ca
Mon Aug 3 09:22:06 EDT 2009


Are you using OpenLayers as your WMS client?  Perhaps it is OpenLayers requesting the tile multiple times?  If you are, try specifying:
 OpenLayers.IMAGE_RELOAD_ATTEMPTS = 1; 

and see if that changes.

Shawn

>>> andrew2 <andrew at cmail.cz> 08/03/09 6:26 AM >>>

Hi,
I'm facing strange behaviour of TileCache. I defined one WMS layer that uses
metatiling. I do not use seeding and tile requests to uncached tiles are
transformed to standard WMS requests. On my desktop it run's very well, but
when I try it on our server with more CPUs, each WMS request to underlying
WMS server is generated twice. And it is really exactly the same requests
(the same BBOX, the same size of the response).
Isn't it possible that, because of parallel processing, two tile requests
laying in the same metatile are evaluated as uncached? Is there any way how
to control this behaviour?

Thanks for any advice.
Andrew
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