[Qgis-developer] qgis-server will crash on a specific project

Sun Jun 22 03:27:44 PDT 2014

you have right,
it is not a good solution. Too project depending and resource consuming.

thx for a better fixing

A.

2014-06-22 12:15 GMT+02:00 Marco Hugentobler <marco.hugentobler at sourcepole.ch>:
>> char* maxLayerEnv = getenv( "MAX_CACHE_LAYERS" )
>
>
> This is a short-time workaround for users.
>
> Regards,
> Marco
>
>
> On 22.06.2014 12:12, Andrea Peri wrote:
>>
>> Hi,
>> thx for response.
>>
>> meanwhile,
>> I notice that the max allowed layers is exactly 101.
>> This mean (knowing C/C++) an array of 100 elements.
>>
>> Searching for this particular value,
>> i find in the file "mapserver/qgsmslayercache.cpp"
>> is defined
>>          mDefaultMaxLayers = 100;
>>
>> if not defined the environment variable "MAX_CACHE_LAYERS"
>>
>> char* maxLayerEnv = getenv( "MAX_CACHE_LAYERS" );
>>    if ( maxLayerEnv )
>>
>>
>> So a possible solution could be to set this environment variable.
>>
>> I try and report.
>>
>> Regards,
>>
>> Andrea.
>>
>>
>> 2014-06-22 12:07 GMT+02:00 Marco Hugentobler
>> <marco.hugentobler at sourcepole.ch>:
>>>
>>> It is a problem with the layer cache. Will provide a fix for that soon.
>>>
>>> Regards,
>>> Marco
>>>
>>>
>>> On 22.06.2014 11:49, Andrea Peri wrote:
>>>>
>>>> Hi,
>>>>
>>>> I confirm.
>>>>
>>>> There is a layer limit in QGIS-Server
>>>>
>>>> I do a huge test removing one by one all the layers from my project.
>>>> And after the removing of every single layer I retest the working.
>>>>
>>>> Aftr a while of time. I reach the limit.
>>>>
>>>> And the project begin to run.
>>>>
>>>> I do other test to exclude that was the number of layer inside a single
>>>> group.
>>>> All the test give the response that seem to be the max number of
>>>> layers in a project.
>>>>
>>>> So the question is:
>>>>
>>>> QGIS desktop allow to put more layers rather than how many are
>>>> accepted from qgis-server.
>>>>
>>>> This not good for a WYSIWYG system.
>>>>
>>>> Ok, I will try to patch my server when found exactly where is the
>>>> problem.
>>>>
>>>> Meanwhile,
>>>> Now the question is on what structure is this limit ?
>>>>
>>>> I don't guess it is simply a layer limit but perhaps a more specific
>>>> structure.
>>>>
>>>> Now I have a project that crash , and a project with a one less layer
>>>> that
>>>> work.
>>>>
>>>>
>>>> Doing a DIFF beetween the two projects I see the possible structure
>>>> breakable are:
>>>>
>>>> layer-tree-canvas -> custom-order -> item
>>>> maplayer
>>>> Digitizing -> LayerSnappingList -> value   (type QStringList)
>>>> Digitizing -> LayerSnappingEnabledList -> value   (type QStringList)
>>>> Digitizing -> LayerSnapToList -> value   (type QStringList)
>>>> Digitizing -> LayerSnappingToleranceList -> value   (type QStringList)
>>>>
>>>> I check if in the code there is a limited array dimension for this
>>>> objects.
>>>>
>>>> Regards,
>>>>
>>>> Andrea.
>>>>
>>>>
>>>> 2014-06-22 7:29 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
>>>>>
>>>>> Hi,
>>>>>
>>>>> I do some other tests.
>>>>>
>>>>> I take my project that give QG crash and split it in two compementary
>>>>> projects.
>>>>> Of course I do this using qgis desktop to avoid unvolontary errors.
>>>>>
>>>>> Testing both of them on QS there is no crash !
>>>>>
>>>>> So:
>>>>> The first plausible theory I can give is that Qgis-Server has a LIMIT
>>>>> to the number of Groups or Layers it can have in a project.
>>>>> A limit different (and less) than qgis desktop (osgeo4w version).
>>>>>
>>>>> Is this a plausible theory ?
>>>>>
>>>>> Thx,
>>>>>
>>>>> Andrea.
>>>>>
>>>>>
>>>>> 2014-06-21 22:04 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
>>>>>>
>>>>>> Hi,
>>>>>> I have a qgis-server that will crash on a specific project.
>>>>>>
>>>>>> The qgis-server will run correctly with another project that seem
>>>>>> almost similar (both use the SVG symbols).
>>>>>>
>>>>>> The project that crash my QG  run correctly and smootly on a qgis
>>>>>> desktop (qgis-dev) on a windows system.
>>>>>> The project use SVG symbols, but also the other project I test on
>>>>>> QSused SVG symbol
>>>>>> so I suppose the SVG engine is ok.
>>>>>> Also I check t have set correctly the SVG paths.
>>>>>> Also I update to the very last (about 4 hours ago) master version.
>>>>>>
>>>>>> After all this check the qgis-server still crash.
>>>>>>
>>>>>> So I try to set the logfile, but the log is always empty.
>>>>>> This mean that the cgi qgis-server will crash almost immediatly.
>>>>>>
>>>>>> So I set an environment shell to run it manually and to test the cgi
>>>>>> with a gdb session.
>>>>>>
>>>>>> The results are this:
>>>>>>
>>>>>> ..................
>>>>>> [Thread debugging using libthread_db enabled]
>>>>>> Using host libthread_db library
>>>>>> "/lib/x86_64-linux-gnu/libthread_db.so.1".
>>>>>> Warning 1: Unable to find driver ECW to unload from GDAL_SKIP
>>>>>> environment variable.
>>>>>> Warning 1: Unable to find driver ECW to unload from GDAL_SKIP
>>>>>> environment variable.
>>>>>> Warning 1: Unable to find driver JP2ECW to unload from GDAL_SKIP
>>>>>> environment variable.
>>>>>> Warning 1: Unable to find driver ECW to unload from GDAL_SKIP
>>>>>> environment variable.
>>>>>> Warning 1: Unable to find driver JP2ECW to unload from GDAL_SKIP
>>>>>> environment variable.
>>>>>> [New Thread 0x7fffe307c700 (LWP 1844)]
>>>>>> [New Thread 0x7fffe27ea700 (LWP 1845)]
>>>>>>
>>>>>> Program received signal SIGSEGV, Segmentation fault.
>>>>>> 0x00007ffff4fc06da in qHash(QString const&) ()
>>>>>>      from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
>>>>>> (gdb)
>>>>>> ............................
>>>>>>
>>>>>> The version of libQtCore.so.4 I run on the linux is 4.8.2.
>>>>>>
>>>>>> Perhaps the 4.8.2 is too old for qgis-server ?
>>>>>> :/
>>>>>> But another project will run without any apparent problem.
>>>>>> ?
>>>>>>
>>>>>> Many thx for every hint.
>>>>>>
>>>>>> --
>>>>>> -----------------
>>>>>> Andrea Peri
>>>>>> . . . . . . . . .
>>>>>> qwerty àèìòù
>>>>>> -----------------
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> -----------------
>>>>> Andrea Peri
>>>>> . . . . . . . . .
>>>>> qwerty àèìòù
>>>>> -----------------
>>>>
>>>>
>>>>
>>>
>>> --
>>> Dr. Marco Hugentobler
>>> Sourcepole -  Linux & Open Source Solutions
>>> Weberstrasse 5, CH-8004 Zürich, Switzerland
>>> marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
>>> Technical Advisor QGIS Project Steering Committee
>>>
>>> _______________________________________________
>>> Qgis-developer mailing list
>>> Qgis-developer at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>
>>
>>
>
>
> --
> Dr. Marco Hugentobler
> Sourcepole -  Linux & Open Source Solutions
> Weberstrasse 5, CH-8004 Zürich, Switzerland
> marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
> Technical Advisor QGIS Project Steering Committee
>
> _______________________________________________
> Qgis-developer mailing list
> Qgis-developer at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-developer

-- 
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Andrea Peri
. . . . . . . . .
qwerty àèìòù
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