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Posted to dev@kafka.apache.org by Sanghyeok An <oj...@gmail.com> on 2026/08/04 14:03:21 UTC
[DISCUSS] KIP-1370: Include Instance and Rack IDs in kafka-streams-groups.sh Member Output
Hello Kafka Community,
I would like to start a discussion on KIP-1370, which proposes including
Streams group member instance IDs and rack IDs in the output of
kafka-streams-groups.sh.
- KIP: https://cwiki.apache.org/confluence/x/44CWGg
The Streams group description already provides the optional instance ID and
rack ID of each member, but these fields are not currently displayed by
kafka-streams-groups.sh --describe --members.
This KIP proposes displaying INSTANCE-ID whenever --members is specified.
RACK-ID will additionally be displayed when --members and --verbose are
specified together.
The goal is to make static membership and rack-aware assignment issues
easier to diagnose using the command-line tool. No Admin API, protocol, or
command-line option changes are required.
Looking forward to the community's feedback.
Best regards,
Sanghyeok An.
Re: [DISCUSS] KIP-1370: Include Instance and Rack IDs in kafka-streams-groups.sh Member Output
Posted by Sanghyeok An <oj...@gmail.com>.
Hi Andrew,
Thanks for taking the time to review this KIP!
AS1.
That makes sense. I've updated the KIP to use GROUP-INSTANCE-ID as the
column header and
to display the column only when at least one group member has a non-empty
instance ID, consistent with kafka-consumer-group.sh
When you get a chance, Please take another look!
Best regards,
Sanghyeok An.
2026년 8월 9일 (일) 오후 4:48, Andrew Schofield <sc...@apache.org>님이 작성:
> Hi,
> Thanks for the KIP. It generally makes sense to me and looks like a useful
> improvement. I can see us following this pattern in a future KIP for share
> groups too. Just one comment.
>
> AS1: I suggest following kafka-consumer-groups.sh for the group instance
> id behaviour. This uses "GROUP-INSTANCE-ID" as the column header, and it
> displays it conditionally depending upon whether the group members have any
> group instance id information.
>
> Thanks,
> Andrew
>
> On 2026/08/09 03:29:25 Sanghyeok An wrote:
> > Hello Kafka Community,
> >
> > I would like to gently follow up on the discussion for KIP-1370, in case
> > anyone has had a chance to take a look.
> > This KIP proposes exposing Streams group member instance IDs and rack IDs
> > in kafka-streams-groups.sh, making it easier to diagnose static
> membership
> > and rack-aware assignment issues using the command-line tool.
> >
> > I would greatly appreciate any feedback, comments, or suggestions you may
> > have.
> >
> > Best regards,
> > Sanghyeok An.
> >
> > 2026년 8월 4일 (화) 오후 11:03, Sanghyeok An <oj...@gmail.com>님이 작성:
> >
> > > Hello Kafka Community,
> > >
> > > I would like to start a discussion on KIP-1370, which proposes
> including
> > > Streams group member instance IDs and rack IDs in the output of
> > > kafka-streams-groups.sh.
> > >
> > > - KIP: https://cwiki.apache.org/confluence/x/44CWGg
> > >
> > > The Streams group description already provides the optional instance ID
> > > and rack ID of each member, but these fields are not currently
> displayed by
> > > kafka-streams-groups.sh --describe --members.
> > > This KIP proposes displaying INSTANCE-ID whenever --members is
> specified.
> > > RACK-ID will additionally be displayed when --members and --verbose are
> > > specified together.
> > >
> > > The goal is to make static membership and rack-aware assignment issues
> > > easier to diagnose using the command-line tool. No Admin API,
> protocol, or
> > > command-line option changes are required.
> > >
> > > Looking forward to the community's feedback.
> > >
> > > Best regards,
> > > Sanghyeok An.
> > >
> >
>
Re: [DISCUSS] KIP-1370: Include Instance and Rack IDs in kafka-streams-groups.sh Member Output
Posted by Andrew Schofield <sc...@apache.org>.
Hi,
Thanks for the KIP. It generally makes sense to me and looks like a useful improvement. I can see us following this pattern in a future KIP for share groups too. Just one comment.
AS1: I suggest following kafka-consumer-groups.sh for the group instance id behaviour. This uses "GROUP-INSTANCE-ID" as the column header, and it displays it conditionally depending upon whether the group members have any group instance id information.
Thanks,
Andrew
On 2026/08/09 03:29:25 Sanghyeok An wrote:
> Hello Kafka Community,
>
> I would like to gently follow up on the discussion for KIP-1370, in case
> anyone has had a chance to take a look.
> This KIP proposes exposing Streams group member instance IDs and rack IDs
> in kafka-streams-groups.sh, making it easier to diagnose static membership
> and rack-aware assignment issues using the command-line tool.
>
> I would greatly appreciate any feedback, comments, or suggestions you may
> have.
>
> Best regards,
> Sanghyeok An.
>
> 2026년 8월 4일 (화) 오후 11:03, Sanghyeok An <oj...@gmail.com>님이 작성:
>
> > Hello Kafka Community,
> >
> > I would like to start a discussion on KIP-1370, which proposes including
> > Streams group member instance IDs and rack IDs in the output of
> > kafka-streams-groups.sh.
> >
> > - KIP: https://cwiki.apache.org/confluence/x/44CWGg
> >
> > The Streams group description already provides the optional instance ID
> > and rack ID of each member, but these fields are not currently displayed by
> > kafka-streams-groups.sh --describe --members.
> > This KIP proposes displaying INSTANCE-ID whenever --members is specified.
> > RACK-ID will additionally be displayed when --members and --verbose are
> > specified together.
> >
> > The goal is to make static membership and rack-aware assignment issues
> > easier to diagnose using the command-line tool. No Admin API, protocol, or
> > command-line option changes are required.
> >
> > Looking forward to the community's feedback.
> >
> > Best regards,
> > Sanghyeok An.
> >
>
Re: [DISCUSS] KIP-1370: Include Instance and Rack IDs in kafka-streams-groups.sh Member Output
Posted by Sanghyeok An <oj...@gmail.com>.
Hello Kafka Community,
I would like to gently follow up on the discussion for KIP-1370, in case
anyone has had a chance to take a look.
This KIP proposes exposing Streams group member instance IDs and rack IDs
in kafka-streams-groups.sh, making it easier to diagnose static membership
and rack-aware assignment issues using the command-line tool.
I would greatly appreciate any feedback, comments, or suggestions you may
have.
Best regards,
Sanghyeok An.
2026년 8월 4일 (화) 오후 11:03, Sanghyeok An <oj...@gmail.com>님이 작성:
> Hello Kafka Community,
>
> I would like to start a discussion on KIP-1370, which proposes including
> Streams group member instance IDs and rack IDs in the output of
> kafka-streams-groups.sh.
>
> - KIP: https://cwiki.apache.org/confluence/x/44CWGg
>
> The Streams group description already provides the optional instance ID
> and rack ID of each member, but these fields are not currently displayed by
> kafka-streams-groups.sh --describe --members.
> This KIP proposes displaying INSTANCE-ID whenever --members is specified.
> RACK-ID will additionally be displayed when --members and --verbose are
> specified together.
>
> The goal is to make static membership and rack-aware assignment issues
> easier to diagnose using the command-line tool. No Admin API, protocol, or
> command-line option changes are required.
>
> Looking forward to the community's feedback.
>
> Best regards,
> Sanghyeok An.
>