Hi all, Big +1 for contributing Stateful Functions to Flink and as for the main question at hand, I would vote for putting it in the main repository.
I understand that this can couple the release cadence of Flink and Stateful Functions although I think the pros of having a "you break it, you fix it" policy outperform the cons of tying the release cadences. Looking forward to the integration and the new usecases it may bring! Cheers, Kostas On Mon, Oct 14, 2019 at 9:35 AM Dian Fu <dian0511...@gmail.com> wrote: > > Hi Stephan, > > Big +1 for adding stateful functions to Apache Flink! The use cases unlocked > with this feature are very interesting and promising. > > Regarding to whether to place it into Flink core repository, personally I > perfer to put it in the main repository. This feature introduces a new set of > APIs and it will support a new set of applications. It enriches the API stack > of Apache Flink. This is somewhat simlar to the Table API & SQL, State > Processor API, CEP library, etc. If the applications supported by this > feature are important enough for Flink, it's more appropriate to put it > directly into the main repository. > > Regards, > Dian > > > 在 2019年10月13日，上午10:47，Hequn Cheng <chenghe...@gmail.com> 写道： > > > > Hi Stephan, > > > > Big +1 for adding this to Apache Flink! > > > > As for the problem of whether this should be added to the Flink main > > repository, from my side, I prefer to put it in the main repository. Not > > only Stateful Functions shares very close relations with the current Flink, > > but also other libs or modules in Flink can make use of it the other way > > round in the future. At that time the Flink API stack would also be changed > > a bit and this would be cool. > > > > Best, Hequn > > > > On Sat, Oct 12, 2019 at 9:16 PM Biao Liu <mmyy1...@gmail.com > > <mailto:mmyy1...@gmail.com>> wrote: > > Hi Stehpan, > > > > +1 for having Stateful Functions in Flink. > > > > Before discussing which repository it should belong, I was wondering if we > > have reached an agreement of "splitting flink repository" as Piotr > > mentioned or not. It seems that it's just no more further discussion. > > It's OK for me to add it to core repository. After all almost everything is > > in core repository now. But if we decide to split the core repository > > someday, I tend to create a separate repository for Stateful Functions. It > > might be good time to take the first step of splitting. > > > > Thanks, > > Biao /'bɪ.aʊ/ > > > > > > > > On Sat, 12 Oct 2019 at 19:31, Yu Li <car...@gmail.com > > <mailto:car...@gmail.com>> wrote: > > Hi Stephan, > > > > Big +1 for adding stateful functions to Flink. I believe a lot of user > > would be interested to try this out and I could imagine how this could > > contribute to reduce the TCO for business requiring both streaming > > processing and stateful functions. > > > > And my 2 cents is to put it into flink core repository since I could see a > > tight connection between this library and flink state. > > > > Best Regards, > > Yu > > > > > > On Sat, 12 Oct 2019 at 17:31, jincheng sun <sunjincheng...@gmail.com > > <mailto:sunjincheng...@gmail.com>> wrote: > > Hi Stephan, > > > > bit +1 for adding this great features to Apache Flink. > > > > Regarding where we should place it, put it into Flink core repository or > > create a separate repository? I prefer put it into main repository and > > looking forward the more detail discussion for this decision. > > > > Best, > > Jincheng > > > > > > Jingsong Li <jingsongl...@gmail.com <mailto:jingsongl...@gmail.com>> > > 于2019年10月12日周六 上午11:32写道： > > Hi Stephan, > > > > big +1 for this contribution. It provides another user interface that is > > easy to use and popular at this time. these functions, It's hard for users > > to write in SQL/TableApi, while using DataStream is too complex. (We've > > done some stateFun kind jobs using DataStream before). With statefun, it is > > very easy. > > > > I think it's also a good opportunity to exercise Flink's core capabilities. > > I looked at stateful-functions-flink briefly, it is very interesting. I > > think there are many other things Flink can improve. So I think it's a > > better thing to put it into Flink, and the improvement for it will be more > > natural in the future. > > > > Best, > > Jingsong Lee > > > > On Fri, Oct 11, 2019 at 7:33 PM Dawid Wysakowicz <dwysakow...@apache.org > > <mailto:dwysakow...@apache.org>> wrote: > > Hi Stephan, > > > > I think this is a nice library, but what I like more about it is that it > > suggests exploring different use-cases. I think it definitely makes sense > > for the Flink community to explore more lightweight applications that > > reuses resources. Therefore I definitely think it is a good idea for Flink > > community to accept this contribution and help maintaining it. > > > > Personally I'd prefer to have it in a separate repository. There were a few > > discussions before where different people were suggesting to extract > > connectors and other libraries to separate repositories. Moreover I think > > it could serve as an example for the Flink ecosystem website[1]. This could > > be the first project in there and give a good impression that the community > > sees potential in the ecosystem website. > > Lastly, I'm wondering if this should go through PMC vote according to our > > bylaws[2]. In the end the suggestion is to adopt an existing code base as > > is. It also proposes a new programs concept that could result in a shift of > > priorities for the community in a long run. > > Best, > > > > Dawid > > [1] > > http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-Create-a-Flink-ecosystem-website-td27519.html > > > > <http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-Create-a-Flink-ecosystem-website-td27519.html> > > [2] https://cwiki.apache.org/confluence/display/FLINK/Flink+Bylaws > > <https://cwiki.apache.org/confluence/display/FLINK/Flink+Bylaws> > > On 11/10/2019 13:12, Till Rohrmann wrote: > >> Hi Stephan, > >> > >> +1 for adding stateful functions to Flink. I believe the new set of > >> applications this feature will unlock will be super interesting for new > >> and existing Flink users alike. > >> > >> One reason for not including it in the main repository would to not being > >> bound to Flink's release cadence. This would allow to release faster and > >> more often. However, I believe that having it eventually in Flink's main > >> repository would be beneficial in the long run. > >> > >> Cheers, > >> Till > >> > >> On Fri, Oct 11, 2019 at 12:56 PM Trevor Grant <trevor.d.gr...@gmail.com > >> <mailto:trevor.d.gr...@gmail.com>> wrote: > >> +1 non-binding on contribution. > >> > >> Separate repo, or feature branch to start maybe? I just feel like in the > >> beginning this thing is going to have lots of breaking changes that maybe > >> aren't going to fit well with tests / other "v1+" release code. Just my > >> .02. > >> > >> > >> > >> On Fri, Oct 11, 2019 at 4:38 AM Stephan Ewen <se...@apache.org > >> <mailto:se...@apache.org>> wrote: > >> Dear Flink Community! > >> > >> Some of you probably heard it already: On Tuesday, at Flink Forward > >> Berlin, we announced **Stateful Functions**. > >> > >> Stateful Functions is a library on Flink to implement general purpose > >> applications. It is built around stateful functions (who would have thunk) > >> that can communicate arbitrarily through messages, have consistent state, > >> and a small resource footprint. They are a bit like keyed ProcessFunctions > >> that can send each other messages. > >> As simple as this sounds, this means you can now communicate in non-DAG > >> patterns, so it allows users to build programs they cannot build with > >> Flink. > >> It also has other neat properties, like multiplexing of functions, modular > >> composition, tooling both container-based deployments and as-a-Flink-job > >> deployments. > >> > >> You can find out more about it here > >> - Website: https://statefun.io/ <https://statefun.io/> > >> - Code: https://github.com/ververica/stateful-functions > >> <https://github.com/ververica/stateful-functions> > >> - Talk with motivation: > >> https://speakerdeck.com/stephanewen/stateful-functions-building-general-purpose-applications-and-services-on-apache-flink?slide=12 > >> > >> <https://speakerdeck.com/stephanewen/stateful-functions-building-general-purpose-applications-and-services-on-apache-flink?slide=12> > >> > >> > >> Now for the main issue: **We would like to contribute this project to > >> Apache Flink** > >> > >> I believe that this is a great fit for both sides. > >> For the Flink community, it would be a way to extend the capabilities and > >> use cases of Flink into a completely different type of applications and > >> thus grow the community into this new field. > >> Many discussions recently about evolving the Flink runtime (both on the > >> mailing list and at conferences) show the interest in Flink users in the > >> space that Stateful Functions covers. > >> It seems natural that Stateful Functions should closely co-develop with > >> Apache Flink, ideally as part of the project. > >> > >> There are many details to be discusses, for example whether this should be > >> added to the Flink core repository, or whether we and to create a separate > >> repository > >> for this. But I think we should start discussing this after we have > >> consensus on whether the community wants this contribution. > >> > >> Really looking forward to hear what you think! > >> > >> Best Regards, > >> Stephan > >> > > > > > > -- > > Best, Jingsong Lee >
