We should also add a part for observability. Add some metrics to the delayed 
index buckets and snapshots will help users to tune the
configurations.

And please add a section to describe the upgrade and downgrade.

+1 for the proposal

Penghui
On Jul 27, 2022, 23:50 +0800, Cong Zhao <zhaoc...@apache.org>, wrote:
> Hi Enrico,
> Thanks for your feedback.
>
> > How do you enable this feature? A flag in broker.conf?
> Yes, we add a flag in broker.conf to enable this feature, I will update it
>
> > Is it possible to enable the feature by doing a rolling upgrade of the
> > brokers? What happens if you have brokers that are still running the old
> > tracker?
> I think it is possible to enable the feature by doing a rolling upgrade of 
> the brokers, because the delayed message index in the old tracker only exists 
> in the memory.
>
> > Is it possible to rollback seamlessly?
> It is possible to rollback seamlessly, the old memory tracker will rebuild 
> the delayed message index.
>
> On 2022/07/27 06:19:28 Enrico Olivelli wrote:
> > Good proposal.
> >
> > How do you enable this feature? A flag in broker.conf?
> >
> > Is it possible to enable the feature by doing a rolling upgrade of the
> > brokers? What happens if you have brokers that are still running the old
> > tracker?
> >
> > Is it possible to rollback seamlessly?
> >
> > Enrico
> >
> > Il Mer 27 Lug 2022, 05:39 Dezhi Liu <dezhi...@apache.org> ha scritto:
> >
> > > +1, good job.
> > >
> > > Thanks,
> > > Dezhi
> > >
> > > On 2022/07/25 02:22:00 Cong Zhao wrote:
> > > > Hello Pulsar Community,
> > > >
> > > >
> > > > I would like to open a discussion here about PIP-195 : New bucket based
> > > > delayed message tracker. I look forward to your feedback.
> > > >
> > > >
> > > > PIP: https://github.com/apache/pulsar/issues/16763
> > > >
> > > >
> > > > Thanks,
> > > >
> > > > Cong Zhao
> > > >
> > >
> >
>
> Thanks,
> Cong Zhao

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