[mapserver-users] Version problems with overviews
Jesse Cleary
jcleary at email.unc.edu
Mon Apr 7 08:51:56 PDT 2008
Hi folks
Just chatted with Frank W on IRC and he suggested that the issue is
likely one with GDAL. Turns out our GDAL version is "antique" so that
will be a first place to upgrade. Will try to reproduce the issue
outside of MapServer to confirm...
Jesse
Jesse Cleary wrote:
> Hi folks
>
> Apologies for the re-post. This went out initially prior to our
> feedback loop last week and I thought it might have gotten lost in the
> flood. Or maybe I just can't take a hint...
>
> ---
>
> I'm dealing with a server with several versions of MapServer on it.
> We are serving PNGs from the filesystem via CGI and working to speed
> up performance. I've been trying gdaladdo (-r nearest) to create
> overviews for each image. Mainly this works great and does give us
> the speed increase I'm after.
>
> However, some of the MS versions on this box balk once I create an OVR
> file on any given PNG. Upon calling the PNG in question, I get a 500
> "Internal Server error" error from Apache (2.0.46). So the exact same
> CGI call works without an OVR file and gives me the 500 error with an
> OVR file present. The Apache error logs don't contain a record of the
> 500 error. This is an issue because several existing web service hit
> the problematic (and newer) version of MapServer and I don't want to
> roll back to an older version which might have its own performance costs.
>
> I'm a bit baffled - anyone else seen this kind of error with overview
> files? I'd like some possibilities before I go back to the sys admin
> of the machine in question. Sorry I can't provide more details, but
> it is not my box. Thanks so much folks - apologies for the sketchy
> details...
>
> Jesse
>
>
> This version of MapServer always works, *.OVR present or not:
> MapServer version 4.1 OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP SUPPORTS=PROJ
> SUPPORTS=FREETYPE SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT
> SUPPORTS=WFS_SERVER INPUT=EPPL7 INPUT=POSTGIS INPUT=OGR INPUT=GDAL
> INPUT=SHAPEFILE
>
>
> This version of MapServer only works with no *.OVR file present:
> MapServer version 4.4.0 OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP OUTPUT=PDF
> SUPPORTS=PROJ SUPPORTS=FREETYPE SUPPORTS=WMS_SERVER
> SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT
> INPUT=EPPL7 INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
>
--
Jesse A. Cleary
Department of Marine Sciences
UNC Chapel Hill
334 Chapman Hall
(919) 962-4987
jcleary at email.unc.edu
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