Hi,
I was running a test suite for an app that talks profusely to Virtuoso
via SPARQL HTTP and I kept running into a deadlock.
I was able to isolate the problem by HTTP POSTing the following two
queries consecutively and w/o waiting for the previous one to complete
( with a non blocking client such as a Browser or Node.js ).
FIRST:
modify <urn:test:graph> delete { <urn:test:s1> <urn:test:p1> ?x }
insert { <urn:test:s1> <urn:test:p1> 1 } where { optional{
<urn:test:s1> <urn:test:p1> ?x } }
SECOND:
delete from <urn:test:graph> { <urn:test:s1> <urn:test:p1> ?x } where
{ <urn:test:s1> <urn:test:p1> ?x }
I am posting this quickly to see it rings some bells just by looking
at the queries and the explanation. If it doesn't, I can try to
provide you with the setup to reproduce.
The machine runs the following version of Virtuoso:
Virtuoso Open Source Edition (multi threaded)
Version 6.1.0.3126-pthreads as of Feb 16 2010
--
Aldo Bucchi
@aldonline
skype:aldo.bucchi
http://facebook.com/aldo.bucchi
http://aldobucchi.com/
