[mapguide-users] [MGOS 2.1]few map with Ecw, need restart mapguide service

[Trevor Wekel]

Just as a point of reference, I have been involved with MapGuide and raster since the MapGuide 6.x days.  Stable multi-threaded performance is difficult to achieve due to the sheer number of third party libraries involved.  From what I recall, Autodesk spent at least two developer months in the last release getting the Autodesk Raster Provider to the stable and relatively scalable state it is in currently.

This is not an easy task.  Each file format has to tested, analysed, and fixed separately because the underlying "codec" libraries are all different and come from different vendors.  In other words, stability with TIFF data does not guarantee stability with ECW or MrSID.  In some cases, the vendor libraries may not be 100% thread safe.  MapGuide is a heavily multi-threaded application.  If there is a thread safety problem, it is almost guaranteed that MapGuide will trip over it at some point.

This makes testing and validation especially painful.  I would consider a 24 hour load test on a 4 core machine to be a bare minimum test run for stability.  8+ cores would be preferable.

I personally like working on raster integration in MapGuide.  However, I also have enough background to know that it can be a bit of a black hole as far as development resources go.  Hopefully we as a community can raise enough funds through Project Sponsorship to pay a developer to bury his head in the raster provider for a couple of months.

Thanks,
Trevor

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Jason Birch
Sent: December 27, 2009 6:47 PM
To: MapGuide Users Mail List
Subject: Re: [mapguide-users] [MGOS 2.1]few map with Ecw, need restart mapguide service

It has been pretty decent for me with tiled, overviewed GeoTiffs and
connection cache disabled...

Folks, this is a known problem, but unless someone steps up to fix it,
it is unlikely to get resolved.  ADSK has a proprietary raster
provider, so don't have a vested interest in diagnosing and fixing
this problem.

As I see it, there are two options: wait and hope someone steps in and
fixes it, or pay someone with the experience and ability (Trevor,
Haris, maybe Frank, Kenneth, UV, maybe others) to do it.

Raster in MGOS has been a pain point for at least two releases, so I
wouldn't hold my breath on the first option...

Jason

On 2009-12-27, isca <mapguide2007 at gmail.com> wrote:
>
> It seems the GDAL provider still acts very unstable under MGOS 2.1. There
> has
> been logged a ticket for this. Refer to #1196 MapGuide unresponsive using
> GDAL provider.
>
>
> lunab54 wrote:
>>
>> I make another experience
>>
>> i get an old unused windows 2003 server and i installed MapGuide 2.1 with
>> ecw support
>>
>> miracle ! mapguide with gdal ecw layer run well like service (not debug
>> mode)
>>
>> so i copied the c:\program Files\osgeo\mapguide on the new 2003 server
>> that not run with ecw layer
>>
>> and it's always the same thing : Gdal turn around and the mapguide log
>> said :
>>
>> <2009-12-21T17:46:58> 	4160	Ajax Viewer	127.0.0.1	Administrator
>>  Error: Failed to stylize layer: LAYER_ECW_DEBUG
>>         Cannot create any more connections to the OSGeo.Gdal FDO provider.
>>  StackTrace:
>>   - MgMappingUtil.StylizeLayers() line 776 file
>> c:\osgeo\mapguide_21\mgdev\server\src\services\mapping\MappingUtil.cpp	
>>
>> so now i think there is missing something on this system but what ?
>>
>> help...
>>
>>
>
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