[mapguide-trac] #692: Large tiled tiff catalogs exhibit slow performance

[MapGuide Open Source]

#692: Large tiled tiff catalogs exhibit slow performance
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   Reporter:  trevorwekel  |       Owner:  trevorwekel
       Type:  defect       |      Status:  new        
   Priority:  medium       |   Milestone:             
  Component:  Server       |     Version:  2.0.1      
   Severity:  major        |    Keywords:             
External_id:  1072617      |  
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 !MapGuide exhibits slow performance with very large tiled tiff catalogs
 (ie. thousands of images).  Part of the performance slowdown is due to
 catalog parsing overhead occuring on (nearly) every request.  Since the
 server is limited to a single raster provider connection, accessing
 multiple raster feature sources will cause the catalog to unload and
 reload for every request.

 This can be reproduced by a single user with two catalogs of the same data
 at different pixel resolutions.  Two layers should be constructed from the
 two data sets with adjacent scale ranges.  When viewed, pans on the same
 layer are fast.  Zoom in or zoom out across the two layers is
 significantly slower.

 The fix is to enable multiple connections to the raster provider.  With
 multiple connections, the catalogs will not be regenerated on every
 request.

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/692>
MapGuide Open Source <http://mapguide.osgeo.org/>
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