Re: [HTCondor-users] Preserve history in classad expression

[Jose Caballero <jcaballero.hep@xxxxxxxxx>]

Hi Marco,

AFK, so from the top of my head, would it help to check for UNDEFINED in the logic ?

Good luck,
Jose



On Sep 23, 2019, at 18:31, Marco Mambelli <marcom@xxxxxxxx> wrote:

> 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
> 
> 
> 
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