Hi,
Hugh, I set the provided parameters but I see only the log of the
successful checkpoint. No errors in virtuoso.log.
Regards,
Balazs
On 29/07/16 11:09, Lorenz Buehmann wrote:
Hi Hugh,
I guess Jena gets no connection to the SPARQL service at the time
Virtuoso is temporarily inaccessible
and thus simply returns a 404 error.
Cheers,
Lorenz
On 28.07.2016 15:03, Hugh Williams wrote:
Hi Balazs,
>From your stackoverflow post the
“com.hp.hpl.jena.sparql.engine.http.QueryExceptionHTTP: File not found” error is coming
from Jena, are any error in the Virtuoso log ? When performing a checkpoint which is an
atomic action in Virtuoso the database will be temporarily inaccessible and a
"40001 Error SR172: Transaction deadlocked” error or similar would be returned,
thus a client application should handle such conditions as when handling deadlocks
generally. Thus are any error being reported when this error occurs in Jena, in the
“virtuoso.log” file ?
Can you set the following params in the "[Parameters]" section of the INI file
and restart the server which should enabled more detailed client errors to be returned if
occurring
CallstackOnException = 2
PLDebug = 1
Best Regards
Hugh Williams
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On 25 Jul 2016, at 10:37, Balazs Varhegyi<varh1ibal...@gmail.com> wrote:
Ok, I managed to get this exception when CheckpointSynchMode is 1.
So when I do a query that only reads virtuoso when it does the checkpoint is
causes this com.hp.hpl.jena.sparql.engine.http.QueryExceptionHTTP, why?
Regards, Balazs
On 22/07/16 15:44, Balazs Varhegyi wrote:
Hi,
Why CheckpointSyncMode is 2 by default?
What happens if we set this value to 1?
I found "CheckpointSyncMode" section in this doc:http://docs.openlinksw.com/virtuoso/dbadm/
but is it dangerous to set it to 1 and continue writing and reading virtuoso while it does the checkpoint?
If dangerous, what can happen? if not, why it's not the default?
We have an API that calls virtuoso and it gets an Exception during the
checkpoint:
"com.hp.hpl.jena.sparql.engine.http.QueryExceptionHTTP: File not found"
Best regards,
Balazs Varhegyi
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