A question; How is using something like celery in heat vs taskflow in heat (or at least concept ) 'to many code change'.
Both seem like change of similar levels ;-) What was your metric for determining the code change either would have (out of curiosity)? Perhaps u should look at , although I'm unclear on what the desired functionality is here. Do u want the single engine to transfer its work to another engine when it 'goes down'? If so then the jobboard model + zookeper inherently does this. Or maybe u want something else? I'm probably confused because u seem to be asking for resource timeouts + recover from engine failure (which seems like a liveness issue and not a resource timeout one), those 2 things seem separable.  http://docs.openstack.org/developer/taskflow/jobs.html  http://docs.openstack.org/developer/taskflow/examples.html#jobboard-producer-consumer-simple On Nov 13, 2014, at 12:29 AM, Murugan, Visnusaran <visnusaran.muru...@hp.com> wrote: > Hi all, > > Convergence-POC distributes stack operations by sending resource actions over > RPC for any heat-engine to execute. Entire stack lifecycle will be controlled > by worker/observer notifications. This distributed model has its own > advantages and disadvantages. > > Any stack operation has a timeout and a single engine will be responsible for > it. If that engine goes down, timeout is lost along with it. So a traditional > way is for other engines to recreate timeout from scratch. Also a missed > resource action notification will be detected only when stack operation > timeout happens. > > To overcome this, we will need the following capability: > 1. Resource timeout (can be used for retry) > 2. Recover from engine failure (loss of stack timeout, resource action > notification) > > > Suggestion: > 1. Use task queue like celery to host timeouts for both stack and > resource. > 2. Poll database for engine failures and restart timers/ retrigger > resource retry (IMHO: This would be a traditional and weighs heavy) > 3. Migrate heat to use TaskFlow. (Too many code change) > > I am not suggesting we use Task Flow. Using celery will have very minimum > code change. (decorate appropriate functions) > > > Your thoughts. > > -Vishnu > IRC: ckmvishnu > _______________________________________________ > OpenStack-dev mailing list > OpenStackfirstname.lastname@example.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
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