Re: [DISCUSS] FLIP-182: Watermark alignment

2021-11-23 Thread Piotr Nowojski
Hi Thomas and Akshay, Sorry for the late reply. Due to problems with other FLIPs, we had to scrap our plans to publish FLIP-182 in Flink 1.14. However as far as I know, Arvid is working on this right now, and we are tentatively aiming with this feature for the 1.15.0 release. I hope Arvid will be

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-10-11 Thread akshay padmanabhan
Thanks, Piotr and Arvid. Like Thomas even I'm interested in this feature and was wondering if I can also contribute in some means in this effort. Thanks Akshay On 2021/09/08 15:44:01, Thomas Weise wrote: > Thank you Piotr and Arvid for the context. > > I'm interested in helping with this fe

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-09-08 Thread Thomas Weise
Thank you Piotr and Arvid for the context. I'm interested in helping with this feature. If I'm able to contribute before October, then I will reach out. Thanks, Thomas On Tue, Sep 7, 2021 at 11:33 PM Arvid Heise wrote: > Just to clarify: I specifically asked Piotr to not persue the FLIP if th

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-09-07 Thread Arvid Heise
Just to clarify: I specifically asked Piotr to not persue the FLIP if the current state wouldn't make it in 1.14, such that someone else can take it over and expand it towards per-split alignment. Having a minimalistic version in 1.14 + amendment FLIP in 1.15 would have been fine but now I rather w

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-09-07 Thread Piotr Nowojski
Hi Thomas, Unfortunately me/Arvid didn't have enough time to finish this off for 1.14.0 as we were firefighting other efforts and we have re-focused on other more advanced FLIPs. We want to deliver it for 1.15 though. I'm not sure, but I remember Arvid saying something that he would like to actual

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-09-07 Thread Thomas Weise
Hi, I wanted to check if there is active development on FLIP-182 and what the target release for it might be? [1] still shows as under discussion. Regarding the per-subtask vs. per-split limitation: I think it will be important that this eventually works per split, since in some cases it won't be

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-07-21 Thread Piotr Nowojski
Hi, > I would not fully advertise this before we have the second part implemented as well. I'm not sure, maybe we could advertise with a big warning about this limitation. I mean it's not as if this change would break something. At worst it just wouldn't fully solve the problem with multiple spl

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-07-13 Thread Stephan Ewen
@Eron Wright The per-split watermarks are the default in the new source interface (FLIP-27) and come for free if you use the SplitReader. Based on that, it is also possible to unsubscribe individual splits to solve the alignment in the case where operators have multiple splits assigned. Piotr an

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-07-12 Thread Eron Wright
The notion of per-split watermarks seems quite interesting. I think the idleness feature could benefit from a per-split approach too, because idleness is typically related to whether any splits are assigned to a given operator instance. On Mon, Jul 12, 2021 at 3:06 AM 刘建刚 wrote: > +1 for the s

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-07-12 Thread 刘建刚
+1 for the source watermark alignment. In the previous flink version, the source connectors are different in implementation and it is hard to make this feature. When the consumed data is not aligned or consuming history data, it is very easy to cause the unalignment. Source alignment can resolve ma

Re: [DISCUSS] FLIP-182: Watermark alignment

2021-07-09 Thread Seth Wiesman
+1 In my opinion, this limitation is perfectly fine for the MVP. Watermark alignment is a long-standing issue and this already moves the ball so far forward. I don't expect this will cause many issues in practice, as I understand it the FileSource always processes one split at a time, and in my e

[DISCUSS] FLIP-182: Watermark alignment

2021-07-09 Thread Piotr Nowojski
Hey! A couple of weeks ago me and Arvid Heise played around with an idea to address a long standing issue of Flink: lack of watermark/event time alignment between different parallel instances of sources, that can lead to ever growing state size for downstream operators like WindowOperator. We had