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Re: [OpenDaylight TSC][lists.opendaylight.org代发]Re: Propose a new project: Alt-datastores

han.jie@...
 

- DataTreeChangeService paragraph seems to imply DataTreeChangeService

API contract is not being correctly implemented

"Jie's Answer:"

This is limit to Yongo only by now, but also DataTreeChangeService is provided as a DOMExtensibleService, 

 so it's also ok at API contract level that yongo does not implement it. 

Concretely, when yongo is used seperately by an application / some apps, 

yongo is just to provide the adatper feature, which could help to save binding data into MongoDB, 

as for data change notifications, the system outside of ODL may directly use change streams of MongoDB

 instead of DataTreeChangeService, see Data Access paragraph.

 

- since the feature is integrated at DOMDataBroker level (as opposed at

DOMDataTreeService level), it is not clear how this would work in a

hybrid environment -- I don't quite see where inter-datastore

compatibility is solved. Most notably, it seems that RESTCONF is singled

out as 'special' and has a proxy injected, yet other applications use

specific datastores. How would a mix of CDS/Yongo/etcd-using

applications work and how does this relate to the MD-SAL APIs?

"Jie's Answer:"

Here also is from the scope of Yongo, it's assumed that once yongo(or Etcd etc.) implements DOMDataBroker fully, 

then it's fine to make the new DOMDataBroker be an default one to replace the legacy one (RESTCONF here is 

only a demo of compitability of Yongo), before that, other applications as well as RESTCONF would still use CDS.


- project scope is a bit blurry. Can we get a clear, bullet-point list

of what the project is all about? The sentence 'For Restconf, it

requires users to rebuild 'restconf-nb-bierman02' and

'restconf-nb-rfc8040' to reference to DOMDataBroker and

DOMDataTreeChangeService with a new type.' feels like a hack, not like a

properly-architected solution. This leads me to believe the project does

not really integrate, as it does a whole-sale replacement of a single

implementation. This is going to a nightmare from packaging perspective,

at the very least.

"Jie's Answer:"

As mentioned above, RESTCONF here is only a demo of compitability of Yongo, it's not aim to do 

a replacement of a single implement. For packaging perspective, 

one would package alt-datastores instead of sal-distribute-datastore 

which is transparent to other components.


- the proposal spells DOMRpcService, but does not mention

DOMActionService. RFC7950 makes a rather strong connection between the

operational store and DOMActionService -- what are the interactions

between these?

"Jie's Answer:"

Alt-datastores does not implements DOMRpcService and DOMActionService,

so it's transparent for DOMActionService that who else implements the operational store? 


- what does the 'alt-ds-adapter' do? how does it relate to existing

MD-SAL interface?

"Jie's Answer:"

It is a usecase for replica data, it takeovers DOMDataBroker and adapt

to multiple real adapters, as a result, one application could use this to

push data to CDS/MongoDB/ETCD, as well as Kafka.


- a flow diagram showing interactions between one application using etcd

and another using yongo, is definitely needed. Unless the proposal is to

have such applications live in isolated worlds -- in which case it needs

to be explictly spelled out.

"Jie's Answer:"

Alt-datastores could provide an option of configuration of which application 

uses which datastore by alt-ds-apapter, as a result, alt-ds-adapter could

map data to different datastores.



原始邮件
发件人：RobertVarga <nite@...>
收件人：Abhijit Kumbhare <abhijitkoss@...>;Michael Vorburger <vorburger@...>;Casey Cain <ccain@...>;
抄送人：project-proposals <project-proposals@...>;jinkaiwen@... <jinkaiwen@...>;<tsc@...>;熊泉00091065;guobiaomo@... <guobiaomo@...>;lijiansong@... <lijiansong@...>;zhangminyj@... <zhangminyj@...>;
日 期 ：2019年03月31日 07:37
主 题 ：Re: [OpenDaylight TSC][lists.opendaylight.org代发]Re: Propose a new project: Alt-datastores
Hello,

having reviewed the proposal, I am not quite clear of points here:

- DataTreeChangeService paragraph seems to imply DataTreeChangeService
API contract is not being correctly implemented

- since the feature is integrated at DOMDataBroker level (as opposed at
DOMDataTreeService level), it is not clear how this would work in a
hybrid environment -- I don't quite see where inter-datastore
compatibility is solved. Most notably, it seems that RESTCONF is singled
out as 'special' and has a proxy injected, yet other applications use
specific datastores. How would a mix of CDS/Yongo/etcd-using
applications work and how does this relate to the MD-SAL APIs?

- project scope is a bit blurry. Can we get a clear, bullet-point list
of what the project is all about? The sentence 'For Restconf, it
requires users to rebuild 'restconf-nb-bierman02' and
'restconf-nb-rfc8040' to reference to DOMDataBroker and
DOMDataTreeChangeService with a new type.' feels like a hack, not like a
properly-architected solution. This leads me to believe the project does
not really integrate, as it does a whole-sale replacement of a single
implementation. This is going to a nightmare from packaging perspective,
at the very least.

- the proposal spells DOMRpcService, but does not mention
DOMActionService. RFC7950 makes a rather strong connection between the
operational store and DOMActionService -- what are the interactions
between these?

- what does the 'alt-ds-adapter' do? how does it relate to existing
MD-SAL interface?

- a flow diagram showing interactions between one application using etcd
and another using yongo, is definitely needed. Unless the proposal is to
have such applications live in isolated worlds -- in which case it needs
to be explictly spelled out.

The project proposal has underwent rapid expansion in the few weeks it's
been out and I feel the problem domain is still being explored -- there
are architectural questions which seem to be far from having been
considered, let alone having concrete questions.

I would therefore ask for the review period to be extended, so the
proposal can be fleshed out, especially its interactions with MD-SAL
APIs, packaging and migration point of view.

Note: I am not asking for them to be completely resolved, but rather for
the problems to be acknowledged and a rough outline of a solution to be
brought into the scope of the project or an explicit exclusion added.

Thanks,
Robert


On 30/03/2019 01:30, Abhijit Kumbhare wrote:
> *For Michael's first questions:*
> Isn't there any way we can move on this next week? How about we use that
> TWS slot on Monday where there normally is no agenda for a discussion
> about this with anyone interested?
> 
> *Abhijit's answer:* 
> This Monday-Tuesday we have the DDF. Maybe Jie and you can do a remote
> session at the DDF? What time will work for you folks? (We would like to
> avoid late Tuesday afternoon Pacific time as some ONS related activities
> start).  
> 
> *For Michael's other questions:* 
> Or even just use this email thread to progress asynchronously... does
> anyone reading this have any objections to this project proposal? If
> not, let's just have a vote ASAP?
> 
> *Abhijit's** answer:* 
> In the past, the TSC has offered projects in other timezones to skip
> presenting about the project and for the TSC to vote. In this case it
> certainly makes sense. However there has to be a two week review period
> (as per the creation review process) - which in this case would be March
> 21st to April 3. I will initiate a vote on April 3. 
> 
> 
> On Fri, Mar 29, 2019 at 3:32 AM Michael Vorburger <vorburger@...
> <mailto:vorburger@...>> wrote:
> 
>     On Fri, Mar 29, 2019 at 4:02 AM Abhijit Kumbhare
>     <abhijitkoss@... <mailto:abhijitkoss@...>> wrote:
> 
>         Ok - Michael can you please confirm?
> 
> 
>     I'm on PTO that (and the following) week. Isn't there any way we can
>     move on this next week?
> 
>     How about we use that TWS slot on Monday where there normally is no
>     agenda for a discussion about this with anyone interested?
> 
>     Or even just use this email thread to progress asynchronously...
>     does anyone reading this have any objections to this project
>     proposal? If not, let's just have a vote ASAP?
> 
>     PS: Sorry I missed yesterday's TSC meeting; something unexpected
>     came up.
>      
> 
>         On Thu, Mar 28, 2019 at 5:40 PM <han.jie@...
>         <mailto:han.jie@...>> wrote:
> 
>             Then how about we push it back to April 18th?
> 
> 
>             Thanks,
> 
>             Jie
> 
>             原始邮件
>             *发件人：*MichaelVorburger <vorburger@...
>             <mailto:vorburger@...>>
>             *收件人：*Abhijit Kumbhare <abhijitkoss@...
>             <mailto:abhijitkoss@...>>;
>             *抄送人：*project-proposals@...
>             <mailto:project-proposals@...>
>             <project-proposals@...
>             <mailto:project-proposals@...>>;jinkaiwen@...
>             <mailto:jinkaiwen@...>
>             <jinkaiwen@...
>             <mailto:jinkaiwen@...>>;__<tsc@...
>             <mailto:tsc@...>>;__熊泉
>             00091065;guobiaomo@...
>             <mailto:guobiaomo@...>
>             <guobiaomo@...
>             <mailto:guobiaomo@...>>;lijiansong@...
>             <mailto:lijiansong@...>
>             <lijiansong@...
>             <mailto:lijiansong@...>>;zhangminyj@...
>             <mailto:zhangminyj@...>
>             <zhangminyj@...
>             <mailto:zhangminyj@...>>;
>             *日 期 ：*2019年03月28日 17:06
>             *主 题 ：**Re: [OpenDaylight TSC][lists.opendaylight.org
>             <http://lists.opendaylight.org>代发]Re:  Propose a new
>             project: Alt-datastores*
>             _______________________________________________
>             TSC mailing list
>             TSC@... <mailto:TSC@...>
>             https://lists.opendaylight.org/mailman/listinfo/tsc
> 
> 
>             I just realized that I won't be able to attend the TSC
>             meeting on April 11th (due to school vacation starting here
>             that Friday and related personal plans).
> 
>             If the agenda on today's TSC call is not overly full
>             already, perhaps we could discuss this project proposal today? 
> 
> 
>             On Sat, 23 Mar 2019, 04:18 Abhijit Kumbhare,
>             <abhijitkoss@... <mailto:abhijitkoss@...>> wrote:
> 
>                 The meeting is every Thursday. The details of the
>                 meeting are
>                 at: https://wiki.opendaylight.org/view/TSC:Meeting. So
>                 yes - the Zoom link is a permanent link for the meeting.
> 
> 
>                 On Fri, Mar 22, 2019 at 4:59 PM Yi Yang (杨燚)-云服务集
>                 团 <yangyi01@... <mailto:yangyi01@...>> wrote:
> 
>                     Is next TSC meeting 9:00 AM US Pacific Time On
>                     Thursday, April 11? Is it biweekly? I’ll join this
>                     call for discussion, is this one
>                     https://zoom.us/j/219174946 is permanent meeting
>                     link for it? Anybody can help confirm? Thank you in
>                     advance.
> 
>                      
> 
>                     *发件人:*tsc-bounces@...
>                     <mailto:tsc-bounces@...>
>                     [mailto:tsc-bounces@...
>                     <mailto:tsc-bounces@...>] *代表
>                     *Michael Vorburger
>                     *发送时间:*2019年3月22日18:34
>                     *收件人:*Abhijit Kumbhare <abhijitkoss@...
>                     <mailto:abhijitkoss@...>>
>                     *抄送:*project-proposals@...
>                     <mailto:project-proposals@...>;
>                     jinkaiwen@...
>                     <mailto:jinkaiwen@...>;
>                     <tsc@...
>                     <mailto:tsc@...>>
>                     <tsc@...
>                     <mailto:tsc@...>>;
>                     xiong.quan@...
>                     <mailto:xiong.quan@...>;
>                     guobiaomo@...
>                     <mailto:guobiaomo@...>;
>                     lijiansong@...
>                     <mailto:lijiansong@...>;
>                     zhangminyj@...
>                     <mailto:zhangminyj@...>
>                     *主题:*[lists.opendaylight.org
>                     <http://lists.opendaylight.org>代发]Re:
>                     [OpenDaylight TSC] Propose a new project: Alt-datastores
> 
>                      
> 
>                     On Fri, Mar 22, 2019 at 7:32 AM Abhijit Kumbhare
>                     <abhijitkoss@...
>                     <mailto:abhijitkoss@...>> wrote:
> 
>                         Thank you Jie!
> 
>                          
> 
>                         On Thu, Mar 21, 2019 at 6:37 PM
>                         <han.jie@... <mailto:han.jie@...>>
>                         wrote:
> 
>                             Mr. Chairman, 
> 
>                             Thank you for the arrangement. I will attend
>                             the meeting, will M. and others too?
> 
>                     I'll attend the TSC meeting on April 11.
> 
>                             During the review period,  discussion and
>                             any question is very welcome about the
>                             Alt-datastores.
> 
>                              
> 
>                             Thanks,
> 
>                             Jie
> 
> 
>                                 
> 
>                             原始邮件
> 
>                             *发件人：*AbhijitKumbhare
>                             <abhijitkoss@...
>                             <mailto:abhijitkoss@...>>
> 
>                             *收件人：*韩杰10054376;
> 
>                             *抄送人：*project-proposals
>                             <project-proposals@...
>                             <mailto:project-proposals@...>>;tsc
>                             <tsc@...
>                             <mailto:tsc@...>>;Michael
>                             Vorburger <vorburger@...
>                             <mailto:vorburger@...>>;熊泉
>                             00091065;lijiansong@...
>                             <mailto:00091065%3Blijiansong@...>
>                             <lijiansong@...
>                             <mailto:lijiansong@...>>;guobiao.mo@...
>                             <mailto:guobiao.mo@...>
>                             <guobiao.mo@...
>                             <mailto:guobiao.mo@...>>;zhangminyj@...
>                             <mailto:zhangminyj@...>
>                             <zhangminyj@...
>                             <mailto:zhangminyj@...>>;jinkaiwen@...
>                             <mailto:jinkaiwen@...>
>                             <jinkaiwen@...
>                             <mailto:jinkaiwen@...>>;
> 
>                             *日 期 ：*2019年03月22日08:06
> 
>                             *主 题 ：Re: Propose a new project:
>                             Alt-datastores*
> 
>                             Jie, Michael and folks,
> 
>                             You have submitted the project proposal
>                             today March 21. The next steps would be to
>                             have the creation review for the project in
>                             a TSC meeting after a two week review
>                             period. Ordinarily two weeks would have
>                             placed the review in the April 4th TSC
>                             meeting. Since several of us will be at the
>                             ONS, North America on that date and will
>                             also be meeting in person at the
>                             OpenDaylight DDF on April 1-2, we will
>                             likely cancel that week's meeting. Hence, it
>                             makes sense to have the review in the TSC
>                             meeting on April 11.
> 
>                             Would it be possible for you folks to attend
>                             that meeting? Logistics (web
>                             conference/dial-in) of the TSC meetings are
>                             at: https://wiki.opendaylight.org/view/TSC:Meeting.
> 
>                              
> 
>                             Thanks,
> 
>                             Abhijit
> 
>                              
> 
>                              
> 
>                             On Thu, Mar 21, 2019 at 2:35 AM
>                             <han.jie@...
>                             <mailto:han.jie@...>> wrote:
> 
>                                  
> 
>                                 Dear Abhijit and all, 
>                                 I together with Michael Vorburger and
>                                 team members from China Mobile and China
>                                 Telecom want to propose a new project in
>                                 ODL called Alt-datastores. 
>                                 The topic of this project has alaways
>                                 been discussed in the past. ODL will be
>                                 able to support a 3rd-party datastore
>                                 with our project.
>                                 The details is as the proposal shown:
>                                  https://wiki.opendaylight.org/view/Project_Proposals:Alt-datastores
> 
>                                 Please let me know what should I do next. 
> 
>                                 Best Regards, 
>                                 Jie
> 
>                                  
> 
>                                 韩杰 hanjie
> 
>                                 软件开发工程师 Software Developer
>                                 软件平台南京开发一部/有线研究院/有线产品
>                                 经营部  
> 
>                                 Software Platform Nanjing Development
>                                 Dept I/Wireline Product R&D
>                                 Institute/Wireline Product Operation
>                                 Division
> 
> 
>                                     
> 
>                                  
> 
> 
> 
> _______________________________________________
> TSC mailing list
> TSC@...
> https://lists.opendaylight.org/mailman/listinfo/tsc
> 

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