[HTCondor-users] ep custom configuration

[Antonio Falabella <antonio.falabella@xxxxxxx>]

Dear developers,

I looking for a specific configuration of the execution points of a cluster that I am configuring. The use case is the following: we have big cluster for data acquisition that must allow the execution of jobs through condor only when it is idle, that is when data acquisition is not running. When the data acquisition starts the worker nodes must not run any new jobs. This should be dynamic and looking in the documentation here:

https://htcondor.readthedocs.io/en/latest/admin-manual/ep-policy-configuration.html

in particular the "START _expression_" this is something very similar to the behavior that can be obtained with "KeyboardIdle" machine classad. Now the question comes, is it possible to have a a custom machine classad like the keyboard one that say, given the status of the machine it enables or disables the job submission? The state of the machine exposed through the machine classad should be custom i.e. if some particular process starts on the machine or some other condition happens then I can set

a START _expression_ like

START = NewCustomClassAd > 15 * $(MINUTE)

To me it looks like I can mimic the structure of condor_kbdd and create a custom daemon that exposes the before mentioned custom machine classad. But I am here to ask you if there is something easier to accomplish this.

Hope I have been clear.

Thanks

Antonio