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Kafka >> mail # user >> Topic creation on restart


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Re: Topic creation on restart
>> Would it be possible for the broker to make sure all metadata is
propagated, before completing the startup sequence, and taking on metadata
requests?

Yes, that is the flaw I mentioned before. We need to fix it.
On Thu, Oct 31, 2013 at 9:56 PM, Jason Rosenberg <[EMAIL PROTECTED]> wrote:

> Ok,
>
> So, I can safely ignore these, it sounds like.  I don't see any
> corresponding logging around it subsequently not succeeding to actually
> create the topic in zk.
>
> Would it be possible for the broker to make sure all metadata is
> propagated, before completing the startup sequence, and taking on metadata
> requests?
>
> If I were to not place the newly started broker back into the vip for a
> delay period after the kafka broker has started, would that solve this
> issue?
>
> Jason
>
>
> On Fri, Nov 1, 2013 at 12:39 AM, Jun Rao <[EMAIL PROTECTED]> wrote:
>
> > This is probably because some metadata requests were issued to a newly
> > started broker before the controller has propagated the metadata. Since
> the
> > broker doesn't have the metadata in the cache, it thinks the topic
> doesn't
> > exist and tries to create the topic. The creation will fail though since
> > it's already registered in ZK. These INFO logging should be transient
> > though.
> >
> > Thanks,
> >
> > Jun
> >
> >
> > On Thu, Oct 31, 2013 at 8:41 PM, Jason Rosenberg <[EMAIL PROTECTED]>
> wrote:
> >
> > > Some times during a rolling restart, I see lots of these messages
> during
> > > the restart (these happened in the logs of the 2nd server in the
> cluster
> > to
> > > restart (broker 11), after having restarted started, and during the
> time
> > > the 3rd node (broker 9) is doing a controlled shutdown before
> stopping).
> > >
> > > Is it creating new topics (it shouldn't have been!).  Or is it moving
> > > topics around, or what?
> > >
> > > 2013-11-01 03:25:55,661  INFO [kafka-request-handler-7]
> > admin.AdminUtils$ -
> > > Topic creation { "partitions":{ "0":[ 9, 11 ] }, "version":1 }
> > > 2013-11-01 03:26:01,577  INFO [kafka-request-handler-0]
> > admin.AdminUtils$ -
> > > Topic creation { "partitions":{ "0":[ 9, 10 ] }, "version":1 }
> > > 2013-11-01 03:26:07,767  INFO [kafka-request-handler-1]
> > admin.AdminUtils$ -
> > > Topic creation { "partitions":{ "0":[ 9, 11 ] }, "version":1 }
> > > 2013-11-01 03:26:07,823  INFO [kafka-request-handler-1]
> > admin.AdminUtils$ -
> > > Topic creation { "partitions":{ "0":[ 10, 11 ] }, "version":1 }
> > > 2013-11-01 03:26:11,183  INFO [kafka-request-handler-2]
> > admin.AdminUtils$ -
> > > Topic creation { "partitions":{ "0":[ 10, 11 ] }, "version":1 }
> > > 20
> > >
> >
>