[Tilecache] Missing Tiles

[Terry Austin]

I've tried modifying that value to a unrealistic number (like 5 min) with no
luck.

To be honest, I'm at a point where I'm okay with it - I've worked around it
a bit in the interface portion by adding a "refresh" button.  At some point
I'll probably get back to this and try to find the root cause.  If I
eventually figure it out, I'll be sure to let the list know.

Thanks for all the help.  I know you spend a lot of time on both this and
the OpenLayers list helping folks like me when you don't have to and I, for
one, appreciate it.

Terry Austin
Progressive Partnering


On Mon, Feb 23, 2009 at 12:51 PM, Christopher Schmidt <
crschmidt at metacarta.com> wrote:

> On Tue, Feb 17, 2009 at 10:25:00AM -0600, Terry Austin wrote:
> > All,
> > 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:
> >
> > unlock
> >
> D:\Data\Gis\TN\tilecache\tn\version00001\all\07\000\000\060\000\000\013.png.lck
> > failed: [Error 2] The system cannot find the file specified:
> >
> 'D:\\Data\\Gis\\TN\\tilecache\\tn\\version00001\\all\\07\\000\\000\\060\\000\\000\\013.png.lck'
> >
> > 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.
>
> How long do your metaTiles take to render? if your metaTiles take > 30s,
> then this is expected behavior; anything that waits longer than 30s by
> default will get an error message (specifically,                 raise
> Exception("You appear to have a stuck lock. You may wish to remove the
> lock named:\n%s" % self.getLockName(tile))
> ).
>
> You can configure this timeout by the 'timeout' parameter of the Disk
> Cache section.
>
> Regards,
> --
> Christopher Schmidt
> MetaCarta
>
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