[Engine-devel] Serial Execution of Async Tasks

[Allon Mureinik]

----- Original Message -----
> From: "Yair Zaslavsky" <yzaslavs at redhat.com>
> To: "Eli Mesika" <emesika at redhat.com>
> Cc: "Liron Aravot" <laravot at redhat.com>, "Federico Simoncelli" <fsimonce at redhat.com>, "engine-devel"
> <engine-devel at ovirt.org>, "Eduardo Warszawski" <ewarszaw at redhat.com>, "Yeela Kaplan" <ykaplan at redhat.com>, "Allon
> Mureinik" <amureini at redhat.com>
> Sent: Friday, August 10, 2012 10:48:16 PM
> Subject: Re: [Engine-devel] Serial Execution of Async Tasks
> 
> 
> 
> ----- Original Message -----
> From: "Eli Mesika" <emesika at redhat.com>
> To: "Allon Mureinik" <amureini at redhat.com>
> Cc: "Liron Aravot" <laravot at redhat.com>, "Federico Simoncelli"
> <fsimonce at redhat.com>, "engine-devel" <engine-devel at ovirt.org>,
> "Eduardo Warszawski" <ewarszaw at redhat.com>, "Yeela Kaplan"
> <ykaplan at redhat.com>
> Sent: Friday, August 10, 2012 3:40:48 AM
> Subject: Re: [Engine-devel] Serial Execution of Async Tasks
> 
> 
> 
> ----- Original Message -----
> > From: "Allon Mureinik" <amureini at redhat.com>
> > To: "engine-devel" <engine-devel at ovirt.org>
> > Cc: "Eduardo Warszawski" <ewarszaw at redhat.com>, "Yeela Kaplan"
> > <ykaplan at redhat.com>, "Federico Simoncelli"
> > <fsimonce at redhat.com>, "Liron Aravot" <laravot at redhat.com>
> > Sent: Thursday, August 9, 2012 6:41:09 PM
> > Subject: [Engine-devel] Serial Execution of Async Tasks
> > 
> > Hi guys,
> > 
> > As you may know the engine currently has the ability to fire an SPM
> > task, and be asynchronously be "woken-up" when it ends.
> > This is great, but we found the for the Live Storage Migration
> > feature we need something a bit complex - the ability to have a
> > series of async tasks in a single control flow.
> > 
> > Here's my initial design for this, your comments and criticism
> > would
> > be welcome:
> > http://wiki.ovirt.org/wiki/Features/Serial_Execution_of_Asynchronous_Tasks_Detailed_Design
> 
> Apart from the short explanation & flow , since this is a detailed
> design , I would add
> 1) Class diagram
> 2) Flow diagram
> 
> +1
> I am also interested to get a flow how a task is created (i.e -
> replacement of ConcreateCreateTask) - but this will be handled in
> what Eli has asked for.
> 
> In addition, you have two titles of  "Successful Execution".
Fixed.

> At "compensate" - see how revertTasks currently behaves.
> Also read -
> http://wiki.ovirt.org/wiki/Main_Page/features/RunningCommandsOnEndActionFailure
> 
> This is the work I did for CloneVmFromSnapshot - not saying it's
> perfect - but you should have an infrastructure/pattern to rollback
> not just via spmRevertTask but also using an engine command.
This is what the endWithFailure does - or am I missing your point?
> 
> Yair
> 
> 
> 
> > 
> > 
> > -Allon
> > _______________________________________________
> > Engine-devel mailing list
> > Engine-devel at ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/engine-devel
> > 
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