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From Imesh Gunaratne <im...@apache.org>
Subject Re: 4.1 deployment policy questions
Date Tue, 17 Feb 2015 18:48:57 GMT
Great work Raj! Thanks for the update!

FYI: When you are doing changes please try to avoid any code clean ups in
this branch beacause it would be difficult for us to merge back to master
branch.

Thanks

On Tue, Feb 17, 2015 at 9:38 PM, Rajkumar Rajaratnam <rajkumarr@wso2.com>
wrote:

> Hi Imesh,
>
> I have done the followings as part of the effort in this modification.
>
>    - implemented network partition management logic in CC and updated
>    relevant rest APIs and Service Clients
>    - implemented proper deployment policy validation
>    - fixed authorization action in some rest APIs
>
> Network partition management and deployment policy management are now
> working end-to-end with proper validations. Refer [1] for more detail on
> this.
>
> I am now looking into the changes needs to be done at Autoscaler. Will
> update the progress on this thread.
>
> 1. [Discuss] Deployment policy needs to be validated
>
> Thanks.
>
> On Tue, Feb 17, 2015 at 8:32 PM, Imesh Gunaratne <imesh@apache.org> wrote:
>
>> Hi Raj/Sajith,
>>
>> Appreciate if you can provide an update on the progress we have made so
>> far with this modification.
>>
>> Thanks
>>
>> On Sun, Feb 15, 2015 at 10:40 PM, Imesh Gunaratne <imesh@apache.org>
>> wrote:
>>
>>> Hi Shaheed,
>>>
>>> Please find comments inline:
>>>
>>> On Sun, Feb 15, 2015 at 8:03 PM, Shaheedur Haque (shahhaqu) <
>>> shahhaqu@cisco.com> wrote:
>>>
>>>>  OK, I think we are close. In the following reply, I am only concerned
>>>> with the users view, not any Stratos internal concepts or names.
>>>>
>>>>
>>>>
>>>> I define an “application instance” to be something which is created in
>>>> response to combining an application.json (which contains references to
>>>> named deployment policies, one per subscribableInfo) with a set of
>>>> deployment policies which match the references. These deployment policies
>>>> will have been preloaded into Stratos.
>>>>
>>>>
>>>>
>>> Thanks for the explanation! Yes I completely agree with your view on
>>> this, we will need to expose an application instance id to the user when we
>>> introduce application templates.
>>>
>>>
>>>>  As you say “we cannot switch deployment policies of an application
>>>> once it is deployed. However if needed we can create a new application with
>>>> a new set of deployment policies”. So to avoid doubt…
>>>>
>>>> ·        An application instance must, by necessity, take a snapshot
>>>> of all the policies referred to as the instance is created. Not doing so
>>>> would cause confusion if the deployment policies are later updated.
>>>>
>>> +1 Yes AFAIK this functionality is not there at the moment, we will add
>>> it.
>>>
>>>>  o   Note: this does not preclude later having the ability to modify
>>>> the snapshot (e.g. min/max instance values and so on).
>>>>
>>> Yes, as I mentioned in the previous response, I also would like to have
>>> the ability to update deployment and autoscaling policies with/without
>>> affecting deployed applications.
>>>
>>>>  o   I assume the same snapshotting is needed for the autoscaling
>>>> policies.
>>>>
>>> Yes indeed, autoscaling policies also need to be snapshotted.
>>>
>>>>  o   This does imply that it has to be possible to “show” the current
>>>> state of the application and its snapshotted policies for debugging
>>>> purposes etc.
>>>>
>>> +1
>>>
>>>>  ·        After the instance is deployed, the deployment (and
>>>> autoscaling) policies may be changed without affecting the existing
>>>> instance.
>>>>
>>> Yes, I would like to have the capability to either apply changes to
>>> deployed applications or not to apply them. If so users could use this
>>> feature as they wish.
>>>
>>> Thanks,
>>> Imesh
>>>
>>
>>
>>
>> --
>> Imesh Gunaratne
>>
>> Technical Lead, WSO2
>> Committer & PMC Member, Apache Stratos
>>
>
>
>
> --
> Rajkumar Rajaratnam
> Committer & PMC Member, Apache Stratos
> Software Engineer, WSO2
>
> Mobile : +94777568639
> Blog : rajkumarr.com
>



-- 
Imesh Gunaratne

Technical Lead, WSO2
Committer & PMC Member, Apache Stratos

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