[Tilecache] Missing Tiles
adube at mapgears.com
Tue Feb 17 13:43:32 EST 2009
For the record,
I also had this kind of error happening using tilecache 2.04 on a
linux platform with CGI mode and using metaTile=true and didn't find why
yet. Like you, I switched to metaTile=false to resolve this.
Terry Austin wrote:
> On a Windows Vista / Apache 2.2 / mod_python / TileCache 2.10 ->
> MapServer WMS / OpenLayers setup with no pre-seeding, I'm seeing
> missing tiles on virtually every significant load of tiles in a given
> view like when changing resolutions or when the view requires loading
> a lot of tiles because of a pan. This only occurs when the metaTile
> option is on. Turning off metaTiling makes all tiles appear (but has
> the visual limitations of not using metatiles). I'm seeing this in my
> Apache logs with about the same frequency as the missing tiles:
> failed: [Error 2] The system cannot find the file specified:
> Not sure if that has anything to do with it. Does this seem like a
> locking issue (only metatiles use locks?), or is it some wacky Vista
> TCP limitation thing? I think that the tile is actually generated
> because reloading the page makes everything appear correctly. Also,
> just using the URL of the missing tile in another browser tab works
> correctly, so I know the tile can be generated.
> Not sure if it's related, but when I try to pre-seed it fails with a
> "Zero length data returned from layer." error pretty early in the
> process (after generating only a few tiles).
> I'm pretty new to both Python and TileCache, so I may be missing
> something simple. Any thoughts on this would be appreciated.
> Terry Austin
> Progressive Partnering
> Tilecache mailing list
> Tilecache at openlayers.org
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