[Condor-users] Match-making delays/errors in Condor-G

[Jan Ploski <Jan.Ploski@xxxxxxxx>]

Hello,

I have a problem with match-making not working properly/being too slow in 
Condor 7.0.0. The scenario is as follows: I submit 120 Condor-G jobs 
together from a script. They all begin in status Idle (as expected). I 
then repeatedly invoke condor_q to observe changes in JobStatus and 
LastRejMatchReason of all jobs as time progresses. What I see is that in 
the increasing order of ClusterIds every jobs hits LastRejMatchReason == 
"no match found" once. When this happens, the match-making cycle is 
immediately aborted, so that all jobs with a greater ClusterId remain 
Idle. In one of the following cycles the job which previously had trouble 
is matched correctly, but then the job with ClusterId+1 runs into the same 
"no match found" problem. So it takes at least as many match-making cycles 
as there are jobs in the queue to get every one matched to the target 
resource (which is the same for all jobs and does not constraint the 
accepted job count in any way). Here is an excerpt from NegotiatorLog:

4/25 09:53:28     Getting reply from schedd ...
4/25 09:53:28     Got JOB_INFO command; getting classad/eom
4/25 09:53:28     Request 20658.00000:
4/25 09:53:28 Attempting to use cached MatchList: Failed (MatchList 
length: 0, Autocluster: 0, Schedd Name: jploski@xxxxxxxxxxxxxxxxxxxxxx, 
Schedd Address: <134.106.52.210:20346>)
4/25 09:53:28       Rejected 20658.0 jploski@xxxxxxxxxxxxxxxxxxxxxx 
<134.106.52.210:20346>: no match found
4/25 09:53:28     Sending SEND_JOB_INFO/eom
4/25 09:53:28     Getting reply from schedd ...
4/25 09:53:28     Got NO_MORE_JOBS;  done negotiating
4/25 09:53:28   Schedd jploski@xxxxxxxxxxxxxxxxxxxxxx got all it wants; 
removing it.

Can anyone explain why this is happening?

Regards,
Jan Ploski

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