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Re: [Condor-users] Arbitrary ClassAd attribute

thanks, Alain--using JobClass and MachineClass respectively
makes it work and run on the right node and only the right node.

Steve Timm

On Thu, 13 Oct 2005, Alain Roy wrote:

[root@fnpcsrv1 log]# condor_status -long fnpcsrv1
Class = "IO"
Start = Class =!= UNDEFINED && Class == "IO"


In my job classad:
Requirements = ((TARGET.Class =!= UNDEFINED && TARGET.Class == "IO")) &&
(Arch == "INTEL") && (OpSys == "LINUX") && (Disk >= DiskUsage) && ((Memory
* 1024) >= ImageSize) && (TARGET.FileSystemDomain == MY.FileSystemDomain)
Class = "IO"


What is happening at the moment is that the job is matching
with another machine in the pool that doesn't have Class=IO,
and failing.

What are we doing wrong here?

The semantics of ClassAds in Condor are imperfect. (We have a new version with better semantics, but it's not yet in Condor.)

When you say 'TARGET.Class == "IO"' you are not limiting the scope of the
search for Class to the TARGET ClassAd. Instead, you are setting the start
point of the search. That is, it will search TARGET (the Machine ClassAd),
and if it doesn't find it there it will search MY (the job ClassAd). Since
it's in your Job ClassAd, it found it.

This is clearly not ideal, but at this point it's hard to change: how many
Condor configurations would we break?

In your case, you could define JobClass for the job ClassAd, and
SupportedClass in the machine ClassAd, or something like that. Then you
have unique names that won't conflict in this way.

Sorry for this confusion!


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-- ------------------------------------------------------------------ Steven C. Timm, Ph.D (630) 840-8525 timm@xxxxxxxx http://home.fnal.gov/~timm/ Fermilab Computing Div/Core Support Services Dept./Scientific Computing Section Assistant Group Leader, Farms and Clustered Systems Group Lead of Computing Farms Team