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

[Vikrant Aggarwal <ervikrant06@xxxxxxxxx>]

If I am getting it right are you looking for option like this which is available in job classAD

MachineAttr<X><N>:

Machine attribute of nameÂ<X>Âthat is placed into this job ClassAd, as specified by the configuration variableÂSYSTEM_JOB_MACHINE_ATTRS. With the potential for multiple run attempts,Â<N>Ârepresents an integer value providing historical values of this machine attribute for multiple runs. The most recent run will have a value ofÂ<N>Âequal toÂ0. The next most recent run will have a value ofÂ<N>Âequal toÂ1.

Thanks & Regards,

Vikrant Aggarwal

On Tue, Sep 24, 2019 at 5:46 AM Jose Caballero <jcaballero.hep@xxxxxxxxx> wrote:

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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