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Re: [HTCondor-users] Machine classadd inside SYSTEM_PERIODIC_HOLD ?

Many thanks for your insights, I’ll look into this :]


De : HTCondor-users <htcondor-users-bounces@xxxxxxxxxxx> De la part de John M Knoeller
Envoyé : mercredi 24 juin 2020 16:50
À : HTCondor-Users Mail List <htcondor-users@xxxxxxxxxxx>
Objet : Re: [HTCondor-users] Machine classadd inside SYSTEM_PERIODIC_HOLD ?


There is no easy way to add a TARGET ad to the evaluation of SYSTEM_PERIODIC_HOLD,  doing that would require us to change the code in the Schedd, and even then the TARGET would not always be available when SYSTEM_PERIODIC_HOLD was evaluated and would not be updated during the course of the job.  The Schedd only sees the Machine ad once, when it gets a match from the Negotiator. 


That does not mean that you can’t do something like this, you will just have to go about it a different way.  if you control the job,

you can use $$() expansion or job_machine_attrs to inject an attribute into the job whose value comes from the machine,

then look at that attribute from the SYSTEM_PERIODIC_HOLD _expression_.


Unfortunately, the Disk attribute of a Machine ClassAd is dynamic, and not necessarily updated as frequently as you would need,

so you are better off just tagging the machines that have small disks with a special attribute at config time, something like

this will be more reliably available for $$() expansion.


   # add to the config of machines that have small disks


SmallDiskMachine = true