[torqueusers] Problem with HA and job IDs

Ken Nielson knielson at adaptivecomputing.com
Wed Jun 23 10:14:39 MDT 2010


On 06/23/2010 10:13 AM, Glen Beane wrote:
> On Wed, Jun 23, 2010 at 11:22 AM, Ken Nielson
> <knielson at adaptivecomputing.com>  wrote:
>    
>> On 06/23/2010 01:59 AM, Drew Leske wrote:
>>      
>>> Hi all,
>>>
>>> We've got a high-availability scenario happening with two Torque servers
>>> and for the most part it's pretty good.  The failover is pretty slick
>>> and so on.  But we have found a problem for which I can't find a
>>> solution.
>>>
>>> We have two servers, named A and B.  They both run "pbs_server --ha" and
>>> whichever one is active opens up port 15001 for incoming requests.  If I
>>> kill server A, B picks it up pretty quickly.
>>>
>>> Job IDs are all suffixed with A's FQDN, which is consistent with the
>>> documentation, since A is the first listed server in all configurations.
>>> Even if B is active and A is dead, new jobs will have IDs such as
>>> 498243.A.uvic.ca.
>>>
>>> It turns out this is a problem for client nodes, even if they are
>>> properly configured with /var/spool/torque/server_name containing "A,B".
>>> If specifying a job ID "49824.A.uvic.ca" when B is active, this fails:
>>>
>>>     C$ qstat 85112.A
>>>     Cannot connect to specified server host 'A'
>>>     qstat: cannot connect to server A (errno=111) Connection refused
>>>
>>> If only "85112" is specified, then it works as expected.  It's only when
>>> the full job ID is used that it fails.  "qstat" to simply list the jobs
>>> works fine.
>>>
>>> I don't see any way to override the job IDs, although I would personally
>>> prefer it if I could make the job IDs not use the server name.  But we
>>> have third-party software that cannot be reconfigured to use just the
>>> numeric part, so the failover breaks this software, and it seems odd to
>>> me in any case that I can't specify the full job ID if in a failover
>>> situation.
>>>
>>> I didn't see anything in the archives or documentation that deals with
>>> this.  Any thoughts?
>>>
>>> Thanks,
>>> Drew.
>>>
>>>
>>> Drew Leske, Senior Systems Administrator    | dleske at uvic.ca
>>> Unix Services Team, University Systems      | 250-472-5055 (office)
>>> University of Victoria                      | 250-588-4311 (cel)
>>> _______________________________________________
>>> torqueusers mailing list
>>> torqueusers at supercluster.org
>>> http://www.supercluster.org/mailman/listinfo/torqueusers
>>>
>>>        
>> Did you try just specifying the job number without the host portion of
>> the id?
>>      
> Hi Ken,
>
> this was in his email:
>
> If only "85112" is specified, then it works as expected.  It's only when
> the full job ID is used that it fails.
>
>    
Thanks for pointing that out. I need to work on my speed reading.

Ken


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