[HTCondor-users] Preserve history in classad expression

[Marco Mambelli <marcom@xxxxxxxx>]

Greetings,
I was wondering if there is a way to use the last value of an attribute evaluation to calculate the next one in a classad.
Let's say I'd like to have a trigger that trips a switch that remains set for the rest of the life of the machine (until it's killed or there is a restart).
Something like a circuit breaker.
Is that possible? How could I do that?

Something like this in the configuration is not working:
MYSWITCH = false
MYSWITCH = $(MYSWITCH) || MYTRIGGER

In each evaluation the switch is reset to false, then the result will be true only while the trigger is true, not preserved later.


I tried also to have the value in the log file using the debug macro:
MYSWITCH =debug( $(MYSWITCH) || MYTRIGGER)
but I did not see anything in the log files. The switch value is used in the start expression, so it should be evaluated periodically.


Thanks,
Marco