[openstack-dev] [heat][senlin] Action Required. Idea to propose for a forum for autoscaling features integration

Qiming Teng tengqim at cn.ibm.com
Thu Sep 27 02:27:39 UTC 2018


Due to many reasons, I cannot join you on this event, but I do like to
leave some comments here for references.

On Tue, Sep 18, 2018 at 11:27:29AM +0800, Rico Lin wrote:
> *TL;DR*
> *How about a forum in Berlin for discussing autoscaling integration (as a
> long-term goal) in OpenStack?*

First of all, there is nothing called "auto-scaling" in my mind and
"auto" is most of the time a scary word to users. It means the service
or tool is hiding some details from the users when it is doing something
without human intervention. There are cases where this can be useful,
there are also many other cases the service or tool is messing up things
to a state difficult to recover from. What matters most is the usage
scenarios we support. I don't think users care that much how project
teams are organized.
> Hi all, as we start to discuss how can we join develop from Heat and Senlin
> as we originally planned when we decided to fork Senlin from Heat long time
> ago.
> IMO the biggest issues we got now are we got users using autoscaling in
> both services, appears there is a lot of duplicated effort, and some great
> enhancement didn't exist in another service.
> As a long-term goal (from the beginning), we should try to join development
> to sync functionality, and move users to use Senlin for autoscaling. So we
> should start to review this goal, or at least we should try to discuss how
> can we help users without break or enforce anything.

The original plan, iirc, was to make sure Senlin resources are supported
in Heat, and we will gradually fade out the existing 'AutoScalingGroup'
and related resource types in Heat. I have no clue since when Heat is
interested in "auto-scaling" again. 

> What will be great if we can build common library cross projects, and use
> that common library in both projects, make sure we have all improvement
> implemented in that library, finally to use Senlin from that from that
> library call in Heat autoscaling group. And in long-term, we gonna let all
> user use more general way instead of multiple ways but generate huge
> confusing for users.

The so called "auto-scaling" is always a solution, built by
orchestrating many moving parts across the infrastructure. In some
cases, you may have to install agents into VMs for workload metering. I
am not convinced this can be done using a library approach.

> *As an action, I propose we have a forum in Berlin and sync up all effort
> from both teams to plan for idea scenario design. The forum submission [1]
> ended at 9/26.*
> Also would benefit from both teams to start to think about how they can
> modulize those functionalities for easier integration in the future.
> From some Heat PTG sessions, we keep bring out ideas on how can we improve
> current solutions for Autoscaling. We should start to talk about will it
> make sense if we combine all group resources into one, and inherit from it
> for other resources (ideally gonna deprecate rest resource types). Like we
> can do Batch create/delete in Resource Group, but not in ASG. We definitely
> got some unsynchronized works inner Heat, and cross Heat and Senlin.

Totally agree with you on this. We should strive to minimize the
technologies users have to master when they have a need.
> Please let me know who is interesting in this idea, so we can work together
> and reach our goal step by step.
> Also please provide though if you got any concerns about this proposal.
> [1] https://www.openstack.org/summit/berlin-2018/call-for-presentations
> -- 
> May The Force of OpenStack Be With You,
> *Rico Lin*irc: ricolin

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