Event display unable to gracefully pass
I am running nova through the event display configuration, ie
nova -c /nova/app/users/brebel/artnova/test/job/evd.fcl /nova/app/users/brebel/artnova/test/job/cosmics_reco.root
which attempts to draw tracks stored in the cosmics_reco.root file. The drawing is done through EventDisplay/RecoBaseDrawer.cxx using the art::Event::getView() method to extract prongs from the event. The problem is that if no track was reconstructed for the event, the following message is emitted
nova: /home/greenc/work/cet-is/art-devel/art/Framework/Core/Schedule.h:400: void art::Schedule::processOneOccurrence(typename T::MyPrincipal&) [with T = art::OccurrenceTraits<art::EventPrincipal, (art::BranchActionType)0u>, typename T::MyPrincipal = art::EventPrincipal]: Assertion `action != actions::SkipEvent' failed.
Abort (core dumped)
The core dump appears to be generated by the art::Event::getView() failing to find any rb::Track collection in the event.
Fix issue #940
Add new test for the issue, including a new analyzer
and a new service for testing.
Cleanup up layout of Schedule. Move the logic for writing
the summary to its own member function.
Add EndJobFailure error code, and use it.
Remove unwanted assertions and improve error messages.
#1 Updated by Marc Paterno over 8 years ago
- Category set to Event Loop
- Status changed from New to Assigned
- Assignee set to Marc Paterno
- Priority changed from Normal to High
I have isolated the source of the failure. The member function EventDisplay::postProcessEvent is registered as a callback for the postProcessEvent signal. This function allows exceptions from code it calls to propagate out of the function. Because of the nature of the use of callback functions in art, the framework can not sensibly continue from such an exception, and the program will be shut down. The current failure because of an assertion was an attempt to identify a logic error, which attempt was incorrect (and will be fixed).
The important part of the solution for NOvA will be modification of the EventDIsplay::postProcessEvent function to prevent the emission of all but intentionally fatal exceptions.
Marc with work with Brian on implementing this solution.