Rajeev J Sebastian wrote: > Hi, > > I am experiencing random hangs of the server when using the SPARQL > endpoint. Looking in the error log also echoed on console, there is no > information whatsoever. doing a "kill <pid>" shows "Server received > signal 2" or some such. However, the server doesnt exit. > > I have to issue a SIGTERM for it to actually exit. restarting the > server of course replays the transaction logs, and the data seems > fine. This happens every once in a while, and I have to restart > several times. However, after 3-4 restarts, suddenly everything > becomes fine and it works until the next time this happens a few days > later. > > So, a couple of questions: > 1) has anyone seen this before ? > 2) if so, any reason why it occurs and any fixes/workarounds ? > 3) any way to increase the verbosity of the error log and atleast show > what its doing at a particular time ? >
I can make a couple of suggestions about #3. a) Enable lots of debug tracing (will require PLDebug=1 in the ini-file): http://docs.openlinksw.com/virtuoso/fn_trace_on.html b) As & when it appears hung, try accessing the isql port: isql> status(); c) see if you can tie it down to particular SPARQL queries somehow? HTH, ~Tim -- Tim Haynes Product Development Consultant OpenLink Software <http://www.openlinksw.com/>
