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From Grant Henke <ghe...@cloudera.com>
Subject Re: kafka_2.9.2-0.8.2.0 - Topic marked for deletion
Date Wed, 04 Nov 2015 06:54:07 GMT
Hi Avinash,

This is working as expected. Since delete topics is not enabled, they get
marked for deletion, but never get deleted. Once you enable topic
deletion (delete.topic.enable=true)
the topics marked get delete.

Once the topic is marked for deletion messages will still be available. It
is when the topic is actually deleted that messages can no longer be
consumed. However, in order for a topic to be safely deleted all
producers/consumers of that topic should be stopped. Not stopping the
clients can cause weird behavior especially when auto topic creation is
enabled.

Thank you,
Grant

On Tue, Nov 3, 2015 at 3:15 PM, Kumar, Avinash <Avinash.Kumar@capitalone.com
> wrote:

> Hi,
>
> I am trying to delete the kafka topic, verison I am using is 2.9.2-0.8.2.
> I am using dockerized kafka to delete the topic already created and didn’t
> set the “delete.topic.enable=true”.  When I am listing the topics, it is
> giving as “<TOPIC> marked for deletion”.
>
> Is this a bug? However when I am setting “delete.topic.enable=true” as
> true, it gets deleted immediately. Apart from this I have one more
> question, once the topic is marked for deletion; will messages be still
> available for consumer?
>
> I do see regular updated in controller update with
>
> [2015-11-03 21:05:57,753] TRACE [Controller 1]: checking need to trigger
> partition rebalance (kafka.controller.KafkaController)
>
> [2015-11-03 21:05:57,754] DEBUG [Controller 1]: preferred replicas by
> broker Map(1 -> Map([abcdefghApp,0] -> List(1), [abcdefgApp,0] -> List(1),
> [abcdefApp,0] -> List(1), [adbceApp,0] -> List(1), [abcdApp,0] -> List(1),
> [abcApp,0] -> List(1), [abApp,0] -> List(1), [aApp,0] -> List(1)))
> (kafka.controller.KafkaController)
>
> [2015-11-03 21:05:57,754] DEBUG [Controller 1]: topics not in preferred
> replica Map() (kafka.controller.KafkaController)
>
> [2015-11-03 21:05:57,754] TRACE [Controller 1]: leader imbalance ratio for
> broker 1 is 0.000000 (kafka.controller.KafkaController)
>
> Out of these aApp,abApp and abcApp topics has been marked for deletion.
>
> Thanks,
> Avinash
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-- 
Grant Henke
Software Engineer | Cloudera
grant@cloudera.com | twitter.com/gchenke | linkedin.com/in/granthenke

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