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
[EMAIL PROTECTED]
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