[Pgi-wg] PGI State Model for discussions : PPT from Morris and PDF from Aleksandr

[Etienne URBAH]

Morris, Aleksandr and All,

Concerning the OGF PGI State Model :

Many thanks to Morris and Aleksandr for your proposals.

We NOW have a sound technical basis permitting relevant discussion 
permitting to achieve agreement.

Visibly, PGI requirements are much more complicated than anything 
reasonably achievable with the State Models presented inside BES 
(GFD.108) and HPC File Staging Profile (GFD.135), even with substates.


Personally, even if that would break the current BES recommendation, I 
would prefer that all states (including D and H) are full states, in 
order that all transitions have precise names.


Using the State Model of Aleksandr (which I like very much), we should 
be able to describe that 'Automatic Staging' and 'Manual Staging' can 
occur simultaneously.

Example for simultaneous Stage-in :

-  As soon as the 'Execution Service' knows the Stage-in location (when 
the job is 'Pending' or 'Pre-Processing'), the 'Execution Service' sends 
the URL of the Stage-in location to the job submitter.

-  Automatic and Manual Stage-in can occur simultaneously inside 
'Pre-processing'.

-  If Automatic finishes first, the job goes to 'Pre-processing:D:H', 
and when Manual finishes, the job can go to 'Delegated',

-  If Manual    finishes first, the job stays inside 'Pre-processing', 
and when Automatic finishes, the job can go to 'Delegated'.


So, I confirm that the State Model of Morris is a subset of the State 
Model of Aleksandr, with following tentative correspondence :

Morris                           Aleksandr
------                           ---------
Created:Submitted                Pending
Created:Restarted                Pending
Pending                          Pending:D
Running:Auto-Stage-in            Pre-processing
Created:Hold (Manual Stage-in)   Pre-processing  and  Pre-processing:D:H
Running:Executing                Delegated
Running:Hold                     Delegated:H
Running:Auto-Stage-out           Post-processing
Finished:Manual-Stage-out        Post-processing  and  Post-processing:H
Finished                         Success
Canceled (Terminated)            Canceled
Failed                           Failed-Recoverable  and  Failed


I hope that everyone will make his/her own mind, ask questions, proposes 
clarifications, and helps the PGI State Model to become an stable agreed 
specification, leading to an OGF recommendation.

Best regards.

-----------------------------------------------------
Etienne URBAH         LAL, Univ Paris-Sud, IN2P3/CNRS
                       Bat 200   91898 ORSAY    France
Tel: +33 1 64 46 84 87      Skype: etienne.urbah
Mob: +33 6 22 30 53 27      mailto:urbah at lal.in2p3.fr
-----------------------------------------------------


On Fri, 22 May 2009, Aleksandr Konstantinov wrote:
> On Friday 22 May 2009 12:49, Morris Riedel wrote:
>> Hi PGI team,
>>
>>   as we discussed in going forward by discussing the state model I tried to
>> sketch a first version inside the powerpoint file I put on GridForge:
>>
>> http://forge.gridforum.org/sf/go/doc15637?nav=1
>>
>>
>> Feel free to use it and make your changes that make it easier to discuss it
>> in the next telcons / per mailing lists.
> 
>  I have tried to draw a diagram similar to one we are having in ARC but extended a bit with possible use-cases I could think about. 
> I think it makes superset of your diagram.
> 
> 
> A.K.
> 
> 
>> I also put related work about other state models inside it (HPC-FSP & BES).
>>
>> Note that I created a sub-folder called state-model inside the Execution
>> Service folder for it.
>>
>> Finally, there are certainly some transitions/states that have to be
>> discussed (i.e. sub-states hierarchy), but this version might be a good
>> start.
>>
>>
>> Let's start with the discussion then,
>> Morris
>>
>> ------------------------------------------------------------
>> Morris Riedel
>> SW - Engineer
>> Distributed Systems and Grid Computing Division
>> Jülich Supercomputing Centre (JSC)
>> Forschungszentrum Juelich
>> Wilhelm-Johnen-Str. 1
>> D - 52425 Juelich
>> Germany
>>
>> Email: m.riedel at fz-juelich.de
>> Info: http://www.fz-juelich.de/jsc/JSCPeople/riedel
>> Phone: +49 2461 61 - 3651
>> Fax: +49 2461 61 - 6656
>>
>> Skype: MorrisRiedel
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