Re: [HTCondor-users] force certain type of jobs to run on an specific startd

[Todd L Miller <tlmiller@xxxxxxxxxxx>]

> Basically, if I can have multiple blocks [ ] [ ] inside a JOB_TRANSFORM?

	It's not very well documented, but it would appear not.

> My main problem is that they need to processed in order, and once a job 
> have been successfully handled by one block, it should not be analyzed 
> by the others.  Makes sense?

	The JOB_TRANSFORM_NAMES list is the order in which job 
transformations are applied, so you have control over the order.  I'll 
talk about a possible hack below, but it seems like even if you have 
overlapping requirements for different blocks, given that you have an 
preferred ordering for those blocks, that you can adjust the requirements 
to match.

	For example, if block A requires that a job use fewer then 4 CPUs, 
and block B requires that the job use fewer than 8 GB of RAM, than the 
logic

if( CPUs < 4 ) { A(); }
else if( Memory < 8096 ) { B(); }

is the same as

if( CPUs < 4 ) { A(); }
if( (!(CPUs < 4)) && Memory < 8096 ) { B(); }

and that you could write the requirements expressions to match -- syntax 
completed untested:

requirementsA = CPUs < 4
requirementsB = Memory < 8096

JOB_TRANSFORM_NAMES = A, B

JOB_TRANSFORM_A @= transformA
	requirements = $(requirementsA)
	...
@transformA

JOB_TRANSFORM_B @= transformB
	requirements = (!($(requirementsA))) && $requirementsB
	...
@transformB


	If that approach doesn't work, you could also try setting an 
attribute in the transform that's just a flag telling other transforms 
not to match (syntax completely untested):

JOB_TRANSFORM_NAMES = A, B, CLEANUP

JOB_TRANSFORM_A @= transformA
[
	requirements = ...
	set_transformed = True
	...
]
@transformA

JOB_TRANSFORM_B @= transformB
[
	requirements = (!transformed) && ...
	...
]
@transformB

JOB_TRANSFORM_CLEANUP @= transformCleanup
[
	Delete_transformed = True
]
@transformCleanup

This configuration of course assumes the "transformed" is never used for 
anything else by anyone else, so you'll probably want to pick something 
considerably more unique.

- ToddM