kafka-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From chintan mavawala <chintan25...@gmail.com>
Subject Re: Dynamic topic subscription without using pattern
Date Sun, 07 Jan 2018 13:30:42 GMT
Exactly. This is what I want to achieve.

Is it good practice to keep on updating subscription list of same kafka
consumer?

Any concerns in multi threaded environment?

Regards,
Chintan

On 07-Jan-2018 6:32 PM, "Skip Montanaro" <skip.montanaro@gmail.com> wrote:

Got it. Does it work to maintain your currently subscribed topic list, then
spend to it and subscribe to the extended list when you receive an update?

On Jan 6, 2018 9:37 PM, "chintan mavawala" <chintan25487@gmail.com> wrote:

> Discovery of new topic is not a concern. Clients who creates a new topic
> sends my process the topic name. In simpler words, my process performs
some
> operations which any client might be wanting. So they create a Kafka topic
> and send me the name of the topic for me to subscribe.
>
> My process needs start consuming from this topic too in addition to
already
> subscribed topics.
>
> I hope it makes sense.
>
> Regards,
> Chintan
>
> On 06-Jan-2018 11:30 PM, "Skip Montanaro" <skip.montanaro@gmail.com>
> wrote:
>
> I'm a bit confused. How do you discover that new topics have been created?
> If you discover a new topic somehow, how do you know it's one you are
> interested in?
>
> I suppose you could have a consumer which subscribes to all topics using
> pattern=".", then have it just publish new topic names to a fixed "new
> topics" topic. You could subscribe to that. Still, with no pattern to the
> name you'd need some external information (database query?) to decide if
> you wanted to subscribe to it.
>
> Skip
>
> On Jan 6, 2018 10:43 AM, "chintan mavawala" <chintan25487@gmail.com>
> wrote:
>
> > In theory pattern "." would work. But that would mean subscribing on all
> > topics which I don't want.
> >
> > I share same pain in using pattern which is why I would like to know if
> it
> > is good practice to subscribe to topics after kafka consumer has
started.
> >
> > Regards,
> > Chintan
> >
> > On 06-Jan-2018 5:47 PM, "Skip Montanaro" <skip.montanaro@gmail.com>
> wrote:
> >
> > In theory, wouldn't
> >
> > consumer.subscribe(pattern=".")
> >
> > work? I say "in theory" because my experience with subscribing by
pattern
> > hasn't been great. I suspect my mental model of how it's implemented
> isn't
> > a close approximation of reality.
> >
> > Skip
> >
> > On Jan 6, 2018 4:07 AM, "chintan mavawala" <chintan25487@gmail.com>
> wrote:
> >
> > I want to subscribe to all topics as they are created but topic names
> does
> > not have any pattern. Consumer starts with subscription to let's say 3
> > topics and add more topics to exisiting kafka consumer as they are
> created.
> >
> > Regards,
> > Chintan
> >
> > On 04-Jan-2018 11:02 PM, "Jordan Pilat" <jrpilat@gmail.com> wrote:
> >
> > > Did you want to subscribe to all topics as they are created, or to
> > exclude
> > > some of them?
> > > If the latter, is there a pattern in the names of the topics you wish
> to
> > > exclude?
> > >
> > > - Jordan Pilat
> > >
> > > On 2018-01-03 23:39, chintan mavawala <chintan25487@gmail.com> wrote:
> > > > Hi,
> > > >
> > > > We have a use case where we need to start kafka consumer with a
fixed
> > > list
> > > > of kafka topics and add more topics on the fly. Since there is no
> > pattern
> > > > in names of topics, using pattern for dynamic subscriptions of
topics
> > is
> > > > not feasible.
> > > >
> > > > Is it a good practice to subscribe to topics on given kafka consumer
> on
> > > fly
> > > > using after starting consumer?
> > > >
> > > > I understand that KafkaConsumer is not thread safe. Any ill effects
> due
> > > to
> > > > multi threaded env?
> > > >
> > > > Regards,
> > > > Chintan
> > > >
> > >
> >
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message