[Condor-users] Job-finish requirement

["Justin Ottley" <justin.ottley@xxxxxxxxx>]

Hey Condor users,

is there a way to specify, either in a job ClassAd, with DAGMan, or
some other way in Condor, that a job should not run until another
already queued job has finished?

I am aware that you can submit a set of new jobs with dependencies
between them with DAGMan, but it isnt obvious to me how you can
construct a constraint for a job so that it depends on the completion
of a job that is already queued.

I'm also aware that in the job classad's requirements, the prefix MY is
available to reference attributes in the same classad, and the prefix
TARGET is available to reference attributes in the (potential) target
machine's ClassAd. However again, it isnt obvious to me how to
reference another job's ClassAd attributes in requirements _expression_.

thanks,
-justin

PS - one way that I can think of to do this is to submit jobs on hold
and have some custom external process (submitted in the scheduler
universe) which monitors the queue. The process could release jobs at
the right time when other jobs are finished. however, it would be ideal
if this were possible without such a custom process. Thanks again!