[saga-rg] task states

['Andre Merzky']

Hi Haresh, 

Thanks for your feedback!  Its is nice to see more people
reading the posts than the usual suspects :-))

I did not make that clear enough: the schema is only for the
task states, not for the job states.

If you look at the API spec, the job states are much more
detailed.  I will try to put them into a diagram soonish as
well, and would appreciate your feedback to that.

For the task states: tasks in SAGA are just handles to
asynchroneous operations really, so fairly simple things.

For most implementations, a async call (i.e. task) will
probably spawn a thread which performs a operation (e.g.
remote file copy), and watch that thread.  So a 'failed
task' will mean that the file copy failed, not that the
thread was killed -- FAILED so always would mean a user
handled error. 

Does that make sense to you?

Cheers, Andre.



Quoting [Haresh Bhatt] (Nov 07 2005):
> 
> Hi,
> 
> I am not much aware about SAGA activities. However, I could not resist
> myself in mentioning few points about the task state management. Please
> ignore if it is already discussed.
> 
> 1.  Task may encounter two types of errors: (a) User handled error and (b)
> system thrown errors. First one is preferred by many programmers to get more
> meaningful messages. We need to handle both. 
> 2.  Should we need to handle the states like Suspend, Resume, Restarted,
> etc?
> 3.  How does error will impact on resource management? Will the resource be
> freed? If yes then what about the time commitments (reservation)? If No then
> what will happen if an error is not handled for long time period? Shall we
> still considered the process state as ERRORNEOUS or give another meaningful
> state?
> 4.  If workflow is part of SAGA then we may need to handle few more states.
> 
> Regards,
> 
> Haresh
> ----------------------------------------------------------------------------
> --------
> Dr. Haresh S. Bhatt
> Scientist/Engineer 'SF'
> Indian Space Research Organization
> ND/SAG/SITAA
> Space Applications Centre
> Ahmedabad 380 015
> eMail: haresh at sac.isro.gov.in
> Phone: 
> 91-79-2691 4731 (Desk)
> 91-79-2691 4744 (Lab 1) 
> 91-79-2691 4742 (Lab 2)
> 91-79-2691 4375 (Lab 3)
> 91-79-2691 4376 (Lab 4)
> 
> -----Original Message-----
> From: owner-saga-rg at ggf.org [mailto:owner-saga-rg at ggf.org] On Behalf Of
> Andre Merzky
> Sent: Saturday, November 05, 2005 11:32 AM
> To: Simple API for Grid Applications WG
> Subject: [saga-rg] task states
> 
> Hi all, 
> 
> we had some open notes about task states.  Attached is a
> proposal for a task state model, which incorporates the task
> states we have in the strawman with the proposals.  Does
> anybody see any difficulties with that?
> 
> Best regards, 
> 
>   Andre.
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