[mapguide-trac] #528: Grey images from mapserver with GETMAPIMAGE operation

[MapGuide Open Source]

#528: Grey images from mapserver with GETMAPIMAGE operation
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   Reporter:  trondat  |       Owner:       
       Type:  defect   |      Status:  new  
   Priority:  medium   |   Milestone:       
  Component:  Server   |     Version:  2.0.0
   Severity:  major    |    Keywords:       
External_id:           |  
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 After some time of operation the mapserver returns blank grey ( RGB
 237,237,237 ) images until the Maguide service is restarted. Also during
 multiple request some of the layers are not drawn, missing from the image,
 but those can be drawn on the next request.

 The map template used consists of only static SDF layers no raster or
 database layers.

 This behavior can be reproduced using a web load generator simulating 2
 users continously requesting maps for 2-6 hours. The users select from a
 pool of different positions and scales.

 When the serverer just returns grey images, the only way to get it working
 again is to restart the Mapguide server service. I have also noticed that
 when the mapguide server returns grey images the mgserver.exe consumes 900
 MB of memory and are using around 800 handles. When the service is
 restarted it consumes around 50 MB and are using around 500 handles.

 Example of URL used :
 {{{

 http://127.0.0.1/mapguide/mapagent/mapagent.fcgi?OPERATION=GETMAPIMAGE&VERSION=1.0.0&SESSION=&MAPNAME=&LOCALE=en&MAPDEFINITION=Library://Map/MyMap.MapDefinition&FORMAT=PNG&SELECTION=&SETVIEWCENTERX=200597.800000&SETVIEWCENTERY=4780037.000000&SETVIEWSCALE=98380.905600&SETDISPLAYDPI=96&SETDISPLAYWIDTH=520&SETDISPLAYHEIGHT=400&SHOWLAYERS=&HIDELAYERS=&SHOWGROUPS=&HIDEGROUPS&USERNAME=Anonymous

 }}}

 Here is an entry from the error.log file :

 <2008-03-31T14:13:21>                   Administrator
  Error: Failed to stylize layer: land_layer
         An exception occurred in FDO component.
         SDF connect failed. File does not exist or cannot be opened in
 specified access mode.
  StackTrace:
   - MgMappingUtil.StylizeLayers line 776 file
 d:\buildforgeprojects\mapguide_open_source_v2.0\build_23.8\mgdev\server\src\services\mapping\MappingUtil.cpp
 Failed to stylize layer: land_layer
 An exception occurred in FDO component.
 SDF connect failed. File does not exist or cannot be opened in specified
 access mode.



 I have tried both using mapagent.fcgi and isapi_mapagent.dll. They produce
 the same behavior I supose those two are equal.

 This bug is also seen MG 1.1 , but then the maps returned where black RGB
 (0,0,0).

 /Trond Tunheim, CellVision AS

-- 
Ticket URL: <http://trac.osgeo.org/mapguide/ticket/528>
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