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

[Andrea Peri]

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
> -----------------



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