Re: [dotNetRDF-Develop] Stackoverflow calling QueryWithResultGraph()

[Rob V. <rv...@do...>]

Rob

You didn't include the query or any context of how you invoke the query so
we can't really offer any attempt at diagnosis.  Please provide a minimal
complete example.

Are the results you provided the results of a successful run of the specific
query or a dump of the entire test dataset?  Nothing looks untoward with the
data so likely some interaction with the specific query.

QueryWithResultGraph() implies use of SparqlRemoteEndpoint (whether
directly/indirectly) to query a remote service so can you provide the code
that invokes the query plus the specific problematic query.  The only kind
of query that springs to mind that could easily lead to a StackOverflow
would be a complex property path but without seeing the query I can't tell,
it may well be something innocuous hitting a rare corner case in our SPARQL
engine.

Also what can you tell us about the set up of that remote service since you
imply you control that as well.  Is the remote server using dotNetRDF to
host the data, if so what's the setup?

Or if it isn't under your control can you tell us anything about it e.g.
endpoint, server software if known etc

Thanks,

Rob Vesse

From:  Rob Nicholls <ro...@co...>
Reply-To:  dotNetRDF Developer Discussion and Feature Request
<dot...@li...>
Date:  Thursday, 30 January 2014 05:44
To:  <dot...@li...>
Subject:  [dotNetRDF-Develop] Stackoverflow calling QueryWithResultGraph()

> Hi all,
>  
> I¹m receiving consistent stack overflows from QueryWithResultGraph(query) when
> using a specific query against our triple store. The query runs fine (within
> ms) and returns results ok.
>  
> Results returned from the triple store are in the attached file
> (queryresults.txt), not a huge amount of data to justify killing a 12GB web
> server, and it does occasionally function correctly on my developer machine
> (never when running the debugger though).
>  
> Can anyone offer any advice?
> Is this perhaps an issue with the data itself causing some kind of circular
> reference? Although doesn¹t explain why it occasionally works.
>  
> Using: 
> dotnetRdf 1.0.3 / .NET4.5
>  
> Many thanks,
> Rob
>  
> cogapp
>  
>  
> Rob Nicholls
> Senior Programmer
> +44 1273 821600
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