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From Akhilesh Pathodia <pathodia.akhil...@gmail.com>
Subject Re: Topic deletion
Date Fri, 07 Apr 2017 08:56:47 GMT
I am not sure but kafka delete command does not delete the topic actually,
it only marks it for deletion. Probably it is fixed in later version of
kafka.

On Fri, Apr 7, 2017 at 2:14 PM, Adrian McCague <Adrian.McCague@zopa.com>
wrote:

> Hi Akhilesh,
>
> Why would this approach need to be taken over the kafka-topics tool, out
> of interest?
>
> Thanks
> Adrian
>
> -----Original Message-----
> From: Akhilesh Pathodia [mailto:pathodia.akhilesh@gmail.com]
> Sent: 07 April 2017 09:37
> To: users@kafka.apache.org
> Subject: Re: Topic deletion
>
> Hi Adrian,
>
> You will have to delete the broker directory from zookeeper. This can be
> done  from zookeeper cli. Connect to zookeeper cli using below command:
>
> zookeeper-client -server <ZOOKEEPER_URI>
>
> Then run below command :
>
> rmr /brokers/topics/<TOPIC_NAME>
>
> Thanks,
> AKhilesh
>
> On Thu, Apr 6, 2017 at 11:03 PM, Adrian McCague <Adrian.McCague@zopa.com>
> wrote:
>
> > Hi all,
> >
> > I am trying to understand topic deletion in kafka, there appears to be
> > very little documentation or answers on how this works. Typically they
> > just say to turn on the feature on the broker (in my case it is).
> >
> > I executed:
> > Kafka-topics.bat -delete -zookeeper keeperhere -topic mytopic
> >
> > Running this again yields:
> > Topic mytopic is already marked for deletion.
> >
> > --describe yields:
> > Topic: mytopic  PartitionCount:6        ReplicationFactor:3     Configs:
> > retention.ms=0
> >         Topic: mytopic  Partition: 0    Leader: -1      Replicas:
> > 1006,1001,1005        Isr:
> >         Topic  mytopic  Partition: 1    Leader: -1      Replicas:
> > 1001,1005,1003        Isr:
> >        Topic: mytopic  Partition: 2    Leader: -1      Replicas:
> > 1005,1003,1004        Isr:
> >         Topic: mytopic  Partition: 3    Leader: -1      Replicas:
> > 1003,1004,1007        Isr:
> >         Topic: mytopic  Partition: 4    Leader: -1      Replicas:
> > 1004,1007,1006        Isr:
> >         Topic: mytopic  Partition: 5    Leader: -1      Replicas:
> > 1007,1006,1001        Isr:
> >
> > You can see that the deletion mark has meant that the Leader is -1.
> > Also I read somewhere that retention needs to be set to something low
> > to trigger the deletion, hence the config of retention.ms=0
> >
> > Consumers (or streams in my case) no longer see the topic:
> > org.apache.kafka.streams.errors.TopologyBuilderException: Invalid
> > topology building: stream-thread [StreamThread-1] Topic not found:
> > mytopic
> >
> > And I can't create a new topic in its place:
> > [2017-04-06 18:26:00,702] ERROR org.apache.kafka.common.
> errors.TopicExistsException:
> > Topic 'mytopic' already exists. (kafka.admin.TopicCommand$)
> >
> > I am a little lost as to where to go next, could someone explain how
> > topic deletion is actually applied when a topic is 'marked' for
> > deletion as that may help trigger it.
> >
> > Thanks!
> > Adrian
> >
> >
>

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