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From Mohammed Manna <manme...@gmail.com>
Subject Re: Cluster in weird state: no leaders no ISR for all topics, but it works!
Date Thu, 01 Jun 2017 15:32:27 GMT
Could you please share your broker/zookeeper/topic configs ?

On 1 June 2017 at 16:18, Del Barrio, Alberto <
alberto.delbarrio@360dialog.com> wrote:

> I tried creating the topic and results are very similar to the current
> situation: there are not ISR and no leader for any of the partitions, but
> now kafka-topics shows *Leader: none* when for all the other topics, it
> shows *Leader: -1*
>
>
> On 1 June 2017 at 17:05, Mohammed Manna <manmedia@gmail.com> wrote:
>
> > I had a similar situation, but only 1 of my ZKs was struggling - but
> since
> > the ISR synching time is configurable I was confident to bounce 1 ZK at a
> > time and it worked out.
> > does it happen even when you create a new topic with a
> > replication:partition ration of 1?
> >
> > i meant, 3 replicas, 3 partitions :)
> >
> > On 1 June 2017 at 15:58, Del Barrio, Alberto <
> > alberto.delbarrio@360dialog.com> wrote:
> >
> > > Hi Mohammed,
> > >
> > > thanks for your answer.
> > > The ZK cluster is not located in the servers where Kafka runs but in
> > other
> > > 3 different machines. This ZK cluster is used by several other services
> > > which are not reporting problems.
> > > As you suggested, I haven't tried restarting the kafka-server processes
> > > because there's no leader for topic partitions, so I don't know what
> will
> > > happen. Never been in a similar situation with Kafka after some years
> > using
> > > it.
> > >
> > >
> > >
> > >
> > > On 1 June 2017 at 16:29, Mohammed Manna <manmedia@gmail.com> wrote:
> > >
> > > > Hi Alberto,
> > > >
> > > > Usually this means that the leader election/replica syncing couldn't
> be
> > > > successful and the zookeeper logs should be able to show this
> > information
> > > > too. The leader -1 is what worries me. For your case (3 broker
> > cluster),
> > > I
> > > > am assuming you have done the cluster configuration to have 1
> > > > broker-zookeeper setup ?
> > > > If that's the case, you should be able to bounce 1 zookeeper at a
> time
> > > and
> > > > see if that resolves the issue.
> > > >
> > > > That said, have you restarted  your servers since this issue
> surfaced?
> > > >
> > > > On 1 June 2017 at 14:11, Del Barrio, Alberto <
> > > > alberto.delbarrio@360dialog.com> wrote:
> > > >
> > > > > Hi all,
> > > > >
> > > > > I'm experiencing an issue which I don't know how to solve, so I'm
> > > trying
> > > > to
> > > > > find some guidance on the topic.
> > > > >
> > > > > I have a cluster composed by 3 servers, one broker per server
> running
> > > > Kafka
> > > > > 0.10.0.1-1 which runs in production with around 100 topics, most
of
> > > them
> > > > > divided in several partitions and replicated always between 2
> > servers.
> > > > > Suddenly I've notice when looking at my topics (with kafka-topics
> > tool)
> > > > > that no one of them have a leader (Leader: -1) and the list of ISR
> > > > appears
> > > > > empty for all the topics.
> > > > > So they look something like:
> > > > >
> > > > > Topic:mytopic   PartitionCount:3    ReplicationFactor:2    Configs:
> > > > > retention.ms=86400000
> > > > >     Topic: mytopic    Partition: 0    Leader: -1    Replicas: 30,10
> > > > Isr:
> > > > >     Topic: mytopic    Partition: 1    Leader: -1    Replicas: 10,20
> > > > Isr:
> > > > >     Topic: mytopic    Partition: 2    Leader: -1    Replicas: 20,30
> > > > Isr:
> > > > >
> > > > > However the applications using it are running normally, consumers
> as
> > > well
> > > > > as producers.
> > > > > The logs are not showing errors or weird messages with the
> exceptions
> > > of
> > > > > some
> > > > > Failed to rename [/var/log/kafka/log-cleaner.log] to
> > > > > [/var/log/kafka/log-cleaner.log.2017-05-31-17]
> > > > > which appear each few days.
> > > > >
> > > > > Now I would like to bring back to cluster to a good state. I'm
> afraid
> > > of
> > > > > restarting brokers because all of them are supposed to be leaders
> for
> > > > some
> > > > > partitions, so if I restart them and there's no leader I might
> > > experience
> > > > > data loss.
> > > > >
> > > > > Have you face any similar situation? Can someone give me a hint?
> > > > >
> > > > > Thanks in advance,
> > > > > Alberto.
> > > > >
> > > >
> > >
> > >
> > >
> > > --
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> company/360dialog
> > >
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> > >
> > >
> > > *Alberto del Barrio*DevOps Engineer
> > >
> > > <http://www.360dialog.com?utm_campaign=email-signature&utm_
> > > content=-&utm_medium=email&utm_source=signature&utm_term=logo>
> > >
> > >
> > >
> > > *Contact 360dialog*www.360dialog.com
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> > > utm_content=-&utm_medium=email&utm_source=signature&utm_term=url>
> > > info@360dialog.com
> > > +49-(0)30-6098-5953-0
> > >
> > > 360dialog GmbH, Saarbr├╝cker Str. 36-38, 10405 Berlin, Germany
> > > Managing director: Roland Siebert
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> > > VAT ID: DE815382679
> > >
> >
>
>
>
> --
> News, jobs, product releases, events.
> Follow 360dialog on LinkedIn <https://www.linkedin.com/company/360dialog>
>  and Twitter <https://twitter.com/360dialog>.
> Subscribe to our newsletter <http://www.360dialog.com/newsletter/>.
>
>
> *Alberto del Barrio*DevOps Engineer
>
> <http://www.360dialog.com?utm_campaign=email-signature&utm_
> content=-&utm_medium=email&utm_source=signature&utm_term=logo>
>
>
>
> *Contact 360dialog*www.360dialog.com
> <http://www.360dialog.com/?utm_campaign=email-signature&
> utm_content=-&utm_medium=email&utm_source=signature&utm_term=url>
> info@360dialog.com
> +49-(0)30-6098-5953-0
>
> 360dialog GmbH, Saarbr├╝cker Str. 36-38, 10405 Berlin, Germany
> Managing director: Roland Siebert
> Commercial register: Charlottenbug, HRB 144188 B
> VAT ID: DE815382679
>

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