Re: [openstack-dev] [Heat] Question regarding Stack updates and templates
On 22/09/14 11:04, Anant Patil wrote: Hi, In convergence, we discuss about having concurrent updates to a stack. I wanted to know if it is safe to assume that the an update will be a super set of it's previous updates. Understanding this is critical to arrive at implementation of concurrent stack operations. Assuming that an admin will have VCS setup and will issue requests by checking-out the template and modifying it, I could see that the updates will be incremental and not discreet. Is this assumption correct? When an update is issued before a previous update is complete, would the template for that be based on the template of previously issued incomplete update or the last completed one? Neither. The only thing that matters is that we get to the state described in the latest template. With multiple updates rippling through at a time, it's likely that neither the last completed update nor the last issued update is representative of the current state that we need to modify. Actually, given that updates can fail part-way through, that's already the case. That's why we now update the template incrementally in the database as we make individual changes. cheers, Zane. ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
[openstack-dev] [Heat] Question regarding Stack updates and templates
Hi, In convergence, we discuss about having concurrent updates to a stack. I wanted to know if it is safe to assume that the an update will be a super set of it's previous updates. Understanding this is critical to arrive at implementation of concurrent stack operations. Assuming that an admin will have VCS setup and will issue requests by checking-out the template and modifying it, I could see that the updates will be incremental and not discreet. Is this assumption correct? When an update is issued before a previous update is complete, would the template for that be based on the template of previously issued incomplete update or the last completed one? - Anant ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Heat] Question regarding Stack updates and templates
On Tue, Sep 23, 2014 at 1:04 AM, Anant Patil anant.pa...@hp.com wrote: Hi, In convergence, we discuss about having concurrent updates to a stack. I wanted to know if it is safe to assume that the an update will be a super set of it's previous updates. Understanding this is critical to arrive at implementation of concurrent stack operations. Assuming that an admin will have VCS setup and will issue requests by checking-out the template and modifying it, I could see that the updates will be incremental and not discreet. Is this assumption correct? When an update is issued before a previous update is complete, would the template for that be based on the template of previously issued incomplete update or the last completed one? I don't think you can assume anything about the update. What if the user just posts a totally different template? That is still a valid update. Or they post an empty template to delete the resources. -Angus - Anant ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Heat] Question regarding Stack updates and templates
Excerpts from Angus Salkeld's message of 2014-09-22 20:31:46 -0700: On Tue, Sep 23, 2014 at 1:04 AM, Anant Patil anant.pa...@hp.com wrote: Hi, In convergence, we discuss about having concurrent updates to a stack. I wanted to know if it is safe to assume that the an update will be a super set of it's previous updates. Understanding this is critical to arrive at implementation of concurrent stack operations. Assuming that an admin will have VCS setup and will issue requests by checking-out the template and modifying it, I could see that the updates will be incremental and not discreet. Is this assumption correct? When an update is issued before a previous update is complete, would the template for that be based on the template of previously issued incomplete update or the last completed one? I don't think you can assume anything about the update. What if the user just posts a totally different template? That is still a valid update. Or they post an empty template to delete the resources. Agreed. The new template simply replaces the graph with a new version. If that graph happens to change everything, then the old things will now be in a should not exist desired state and the new template convergence should remove them when it gets to the garbage collection at the end. ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
