Re: [HTCondor-users] Job Transform question

[Todd L Miller <tlmiller@xxxxxxxxxxx>]

> This transform maps the DockerImage ClassAd to the name of the Docker 
> image given the ClassAd NordugridQueue, this logic has workedfor when we 
> have a single queue or two queues. However I wish to expand this logic 
> in the future as we will likely have more than 2 NordugridQueueʼs. Is 
> there a way to define more than 2 IfThenElse mapping statements or is 
> there a more sensible logic to use in this example, almost like a 
> mapping list? We wish to map different Docker images to different queues 
> coming from our NorduGrid CEʼs.

	You can next ifThenElse()s:

ifThenElse( NordugridQueue =?= "EL7", "[name of docker image]",
	ifThenElse( NordugridQueue =?= "EL8", "[name of other image]", "" )
)

but this obviously gets tedious amazingly quickly.  You can instead use 
mapfiles:

EVALSET DockerImage = usermap( "nordugrid_queues_map", NordugridQueue,
	"missing-default", ""
)

See https://htcondor.readthedocs.io/en/latest/classads/classad-mechanism.html
for details and how to configure HTCondor to know what the 
"nordugrid_queues_map" is.  Because the usermap is intended to determine 
which group a user is in, you should avoid commas in the right-most column 
and not include the "missing-default" text anywhere in the mapfile; this 
will ensure that the value you want -- the empty string -- is returned if 
somebody specifies a NordugridQueue that's not in the map file.

-- ToddM