Hi Alieh,

Thanks for the KIP!

Questions:

KT1: In the second paragraph of the Motivation section, it mentions that in 
some cases the consumer does not return the correct next offset. Can you add a 
link to the bug here? I'm curious if that still happens with the "new" consumer.

KT2: There's a comment in the Fetch class' addRecords() method that I'm 
undecided if we need to be concerned about. The comment states that in some 
rare cases of partition leadership changing, we might issue fetches from 
multiple nodes for the same partition. In that rare case, it seems like the 
leader epoch wouldn't be the same for both fetch results, which means we 
wouldn't be able to represent the leader epoch as a single value. There's a 
really, really good chance I'm wringing my hands over this unnecessarily. And 
even if this does occur, it seems like a "last write wins" case that we'll end 
up returning the latest partition owner. Maybe that's all moot?

Thanks,
Kirk

On Mon, Sep 30, 2024, at 5:10 AM, Alieh Saeedi wrote:
> Hi all,
> 
> thanks for the feedbacks.
> Since there is consensus in deprecating the current constructor, we can
> deprecate it for now and remove it later on (in 5.0 maybe).
> The KIP is updated.
> 
> Thanks,
> Alieh
> 
> On Sun, Sep 29, 2024 at 6:22 AM Andrew Schofield <
> andrew_schofield_j...@outlook.com> wrote:
> 
> > @sophie I meant AK tests. But you make a fair point. There will not be
> > that many instances I'm sure, so if the consensus is to deprecate the
> > old constructor, that's fine with me.
> >
> > ________________________________________
> > From: Sophie Blee-Goldman <sop...@responsive.dev>
> > Sent: 28 September 2024 22:56
> > To: dev@kafka.apache.org <dev@kafka.apache.org>
> > Subject: Re: [DISCUSS] KIP-1094 Add a new constructor method with
> > nextOffsets to ConsumerRecords
> >
> > @Andrew do you mean user tests might create ConsumerRecords, or are you
> > concerned about AK tests?
> >
> > I guess Alieh would be the one to implement this, so I'll leave it up to
> > her to investigate the current usage of the existing constructor and
> > whether it feels like too much trivial work to remove it from our own AK
> > tests. Otherwise, on pure API design philosophy grounds, I would prefer to
> > deprecate and remove the old one.
> >
> > However if we feel that users have reason to create ConsumerRecords for
> > tests then it's probably not worth the upheaval to deprecate the old
> > constructor.
> >
> > On Fri, Sep 27, 2024 at 2:38 PM Andrew Schofield <
> > andrew_schofield_j...@outlook.com> wrote:
> >
> > > Hi Matthias,
> > > Tests will also create ConsumerRecords. I don't see the point in forcing
> > a
> > > bunch of trivial changes to tests, that's all.
> > > Of course, it's not too hard to tweak the tests, but it's making work.
> > >
> > > Thanks,
> > > Andrew
> > >
> > > ________________________________________
> > > From: Matthias J. Sax <mj...@apache.org>
> > > Sent: 27 September 2024 18:36
> > > To: dev@kafka.apache.org <dev@kafka.apache.org>
> > > Subject: Re: [DISCUSS] KIP-1094 Add a new constructor method with
> > > nextOffsets to ConsumerRecords
> > >
> > > Thanks for the KIP Alieh.
> > >
> > > Deprecating the existing constructor won't break anybody atm, right? We
> > > don't remove the constructor yet. Of course, in 5.0 in the future we
> > > would apply this breaking change.
> > >
> > > While `ConsumerRecord` is a public API, it seems that actual user code
> > > should never create a `ConsumerRecord` object? In general (of course
> > > this is not in scope of this KIP) I am wondering why we have a public
> > > constructor to begin with (I assume it's some Java limitations how
> > > visibility is managed). Having said this, I would also tend to deprecate
> > > the old constructor.
> > >
> > > @Andrew: Why do you prefer to keep the old constructor? To me it seems
> > > to be an potential source of bugs, to keep the old one?
> > >
> > >
> > > -Matthias
> > >
> > > On 9/27/24 2:19 AM, Andrew Schofield wrote:
> > > > Hi Alieh,
> > > > Thanks for the KIP. Looks like a nice addition to me. I prefer not
> > > deprecating the existing
> > > > constructor too.
> > > >
> > > > Thanks,
> > > > Andrew
> > > >
> > > > ________________________________________
> > > > From: Alieh Saeedi <asae...@confluent.io.INVALID>
> > > > Sent: 27 September 2024 09:09
> > > > To: dev@kafka.apache.org <dev@kafka.apache.org>
> > > > Subject: Re: [DISCUSS] KIP-1094 Add a new constructor method with
> > > nextOffsets to ConsumerRecords
> > > >
> > > > Thank you, Bill and Sophie.
> > > >
> > > > @Bill: You are right. I updated the KIP.
> > > > @Sophie: Yes, it was also our concern, but we thought we should keep
> > the
> > > > current constructor in order to not break the user's code who has
> > called
> > > > this constructor in their code.
> > > >
> > > > Thanks,
> > > > Alieh
> > > >
> > > > On Fri, Sep 27, 2024 at 1:07 AM Sophie Blee-Goldman <
> > > sop...@responsive.dev>
> > > > wrote:
> > > >
> > > >> Should we deprecate the old constructor to make sure that all info
> > gets
> > > >> passed in when creating a ConsumerRecords instance?
> > > >>
> > > >> On Thu, Sep 26, 2024 at 3:37 PM Bill Bejeck <bbej...@apache.org>
> > wrote:
> > > >>
> > > >>> Hi Alieh,
> > > >>>
> > > >>> Thanks for the KIP, it will be very useful to Kafka Streams.
> > > >>> I have one comment.  In the "Proposed Changes" section, you mention
> > the
> > > >>> "The `nextOffsets` object contains the next offset and the last
> > leader
> > > >>> epoch per partition".
> > > >>> If understand the KIP correctly, it should be something along the
> > lines
> > > >> of
> > > >>> "The `nextOffsets` method returns a map of `TopicPartition` to
> > > >>> `OffsetAndMetadata` objects and  `OffsetAndMetadata` contains the
> > next
> > > >>> offset and the last leader epoch per partition"
> > > >>>
> > > >>> Other than that, the KIP LGTM.
> > > >>>
> > > >>> Thanks,
> > > >>> Bill
> > > >>>
> > > >>>
> > > >>> On Wed, Sep 25, 2024 at 7:43 AM Alieh Saeedi
> > > >> <asae...@confluent.io.invalid
> > > >>>>
> > > >>> wrote:
> > > >>>
> > > >>>> Hi all,
> > > >>>>
> > > >>>> I would like to open a discussion for KIP-1094: Add a new
> > constructor
> > > >>>> method with `nextOffsets` to `ConsumerRecords`.
> > > >>>>
> > > >>>> You can find the detailed proposal here:
> > > >>>>
> > > >>>>
> > > >>>
> > > >>
> > >
> > https://cwiki.apache.org/confluence/display/KAFKA/KIP-1094%3A+Add+a+new+constructor+method+with+nextOffsets+to+ConsumerRecords
> > > >>>>
> > > >>>> I look forward to your feedback and suggestions.
> > > >>>>
> > > >>>> Thanks,
> > > >>>> Alieh
> > > >>>>
> > > >>>
> > > >>
> > >
> >
> 

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