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From Lakmal Warusawithana <lak...@wso2.com>
Subject Re: [Discuss] Cloud Controller Clustering Model
Date Wed, 26 Nov 2014 09:14:22 GMT
On Wed, Nov 26, 2014 at 1:16 PM, Imesh Gunaratne <imesh@apache.org> wrote:

> ​Hi Devs,
>
> This is to discuss the clustering model of the cloud controller:
>
>
> ​
>
> As shown in the above diagram the idea is to have a coordinator node to
> handle data persistence logic and message publishing (topology, instance
> status, etc). The coordinator will be selected randomly and at a given time
> there will be only one coordinator. If the existing coordinator node goes
> down, another member will become the coordinator automatically (similar to
> carbon clustering agent).
>
> According to this design Autoscaler (AS)/Stratos Manager (SM) will talk to
> Cloud Controller (CC) via the Cloud Controller Service endpoint exposed via
> the load balancer.
>
> *Data Replication*
> When a request comes into one of the CC instances it will execute the
> necessary actions and update the data holder and/or topology which is in
> memory. At this point the data holder changes will be replicated to other
> instances using a distributed map. Once the coordinator receives the above
> updates it will persist the changes to the registry database.
>
> In this design we might not need to replicate the topology since it is
> already there in the message broker. The idea is to let coordinator publish
> the topology changes and the other members to listen to it.
>
>
IMO, we may need to replicate topology also, otherwise it may occur some
inconsistency.


> Please add your thoughts.
>
> Thanks
>
>
> --
> Imesh Gunaratne
>
> Technical Lead, WSO2
> Committer & PMC Member, Apache Stratos
>



-- 
Lakmal Warusawithana
Vice President, Apache Stratos
Director - Cloud Architecture; WSO2 Inc.
Mobile : +94714289692
Blog : http://lakmalsview.blogspot.com/

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