I went through a few of the recent Flink Forward videos and didn't see solutions to this problem. It sounds like some companies have solutions but they didn't talk about them in enough detail to do something similar.
On Thu, Jan 28, 2021 at 11:45 PM Dan Hill <quietgol...@gmail.com> wrote: > Is this savepoint recovery issue also true with the Flink Table API? I'd > assume so. Just doublechecking. > > On Mon, Jan 18, 2021 at 1:58 AM Timo Walther <twal...@apache.org> wrote: > >> I would check the past Flink Forward conference talks and blog posts. A >> couple of companies have developed connectors or modified existing >> connectors to make this work. Usually, based on event timestamps or some >> external control stream (DataStream API around the actual SQL pipeline >> for handling this). >> >> Also there is FLIP-150 which goes into this direction. >> >> >> https://cwiki.apache.org/confluence/display/FLINK/FLIP-150%3A+Introduce+Hybrid+Source >> >> Regards, >> Timo >> >> >> On 18.01.21 10:40, Dan Hill wrote: >> > Thanks Timo! >> > >> > The reason makes sense. >> > >> > Do any of the techniques make it easy to support exactly once? >> > >> > I'm inferring what is meant by dry out. Are there any documented >> > patterns for it? E.g. sending data to new kafka topics between >> releases? >> > >> > >> > >> > >> > On Mon, Jan 18, 2021, 01:04 Timo Walther <twal...@apache.org >> > <mailto:twal...@apache.org>> wrote: >> > >> > Hi Dan, >> > >> > currently, we cannot provide any savepoint guarantees between >> releases. >> > Because of the nature of SQL that abstracts away runtime operators, >> it >> > might be that a future execution plan will look completely different >> > and >> > thus we cannot map state anymore. This is not avoidable because the >> > optimizer might get smarter when adding new optimizer rules. >> > >> > For such cases, we recommend to dry out the old pipeline and/or >> warm up >> > a new pipeline with historic data when upgrading Flink. A change in >> > columns sometimes works but even this depends on the used operators. >> > >> > Regards, >> > Timo >> > >> > >> > On 18.01.21 04:46, Dan Hill wrote: >> > > How well does Flink SQL work with checkpoints and savepoints? I >> > tried >> > > to find documentation for it in v1.11 but couldn't find it. >> > > >> > > E.g. what happens if the Flink SQL is modified between releases? >> > New >> > > columns? Change columns? Adding joins? >> > > >> > > >> > >> >>
