Re: [Engine-devel] Serial Execution of Async Tasks

From: "Yair Zaslavsky" <yzaslavs(a)redhat.com&gt; To: "Eli Mesika" <emesika(a)redhat.com&gt; Cc: "Liron Aravot" <laravot(a)redhat.com&gt;, "Federico Simoncelli" <fsimonce(a)redhat.com&gt;, "engine-devel" <engine-devel(a)ovirt.org&gt;, "Eduardo Warszawski" <ewarszaw(a)redhat.com&gt;, "Yeela Kaplan" <ykaplan(a)redhat.com&gt;, "Allon Mureinik" <amureini(a)redhat.com&gt; Sent: Friday, August 10, 2012 10:48:16 PM Subject: Re: [Engine-devel] Serial Execution of Async Tasks ----- Original Message ----- From: "Eli Mesika" <emesika(a)redhat.com&gt; To: "Allon Mureinik" <amureini(a)redhat.com&gt; Cc: "Liron Aravot" <laravot(a)redhat.com&gt;, "Federico Simoncelli" <fsimonce(a)redhat.com&gt;, "engine-devel" <engine-devel(a)ovirt.org&gt;, "Eduardo Warszawski" <ewarszaw(a)redhat.com&gt;, "Yeela Kaplan" <ykaplan(a)redhat.com&gt; Sent: Friday, August 10, 2012 3:40:48 AM Subject: Re: [Engine-devel] Serial Execution of Async Tasks ----- Original Message ----- > From: "Allon Mureinik" <amureini(a)redhat.com&gt; > To: "engine-devel" <engine-devel(a)ovirt.org&gt; > Cc: "Eduardo Warszawski" <ewarszaw(a)redhat.com&gt;, "Yeela Kaplan" > <ykaplan(a)redhat.com&gt;, "Federico Simoncelli" > <fsimonce(a)redhat.com&gt;, "Liron Aravot" <laravot(a)redhat.com&gt; > 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_Task... 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".

At "compensate" - see how revertTasks currently behaves. Also read - http://wiki.ovirt.org/wiki/Main_Page/features/RunningCommandsOnEndActionF... 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.

Yair > > > -Allon > _______________________________________________ > Engine-devel mailing list > Engine-devel(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/engine-devel > _______________________________________________ Engine-devel mailing list Engine-devel(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/engine-devel