Re: [HTCondor-users] QUERY_SCHEDD_ADS from workers in sub-collector logs

[Todd Tannenbaum <tannenba@xxxxxxxxxxx>]

On 3/23/2017 1:26 PM, Vladimir Brik wrote:
> Hello.
>
> I've been observing the following entries in the log files of our tiered
> collectors
> (https://htcondor-wiki.cs.wisc.edu/index.cgi/wiki?p=HowToConfigCollectors):
>
> ==> Collector3Log <==
> 03/23/17 13:12:57 Got QUERY_SCHEDD_ADS
> 03/23/17 13:12:57 (Sending 0 ads in response to query)
> 03/23/17 13:12:57 Query info: matched=0; skipped=0; query_time=0.000043;
> send_time=0.000038; type=Scheduler; requirements={( ( Name ==
> "bladeh2.zeuthen.desy.de" ) )}; peer=<141.34.15.90:39843>; projection={}
>
> What are the startds (I presume) trying to do here?
>
> Since we have tiered/sub-collectors, it seems like queries like these
> will always return nothing, since only worker nodes report to them
> (i.e., pool schedds, for example, use the main collector). Is this
> correct? Is this a problem?

Do you have one such query per execute node every 24 hours?  I.e. did 
you have a similar query to the above from bladeh2.zeuthen yesterday 
3/22/17 at about 13:12 pm ?

Every 24 hours, the condor_master spawns condor_preen, and condor_preen 
cleans up files left behind in log, spool, execute, etc.  I bet the 
above is coming from condor_preen when it cleans up any stale/old files 
left behind in the SPOOL directory.  In the source for condor_preen at 
https://is.gd/nOC73H it looks like it attempts to connect to a schedd 
running on the local machine (which could cause such a collector query 
esp if there is no schedd running there) so it can certain to not clean 
out any files in SPOOL that are still required by the local condor_schedd.

TL;DR : I don't think the above will cause you any problems.

regards,
Todd



> Thanks,
>
> Vlad
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--
Todd Tannenbaum <tannenba@xxxxxxxxxxx> University of Wisconsin-Madison
Center for High Throughput Computing   Department of Computer Sciences
HTCondor Technical Lead                1210 W. Dayton St. Rm #4257
Phone: (608) 263-7132                  Madison, WI 53706-1685