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From Andrew Otto <o...@wikimedia.org>
Subject Re: delete a topic
Date Fri, 23 Aug 2013 21:57:14 GMT
I maintain a kafka wrapper shell script wrapper for our Kafka packaging.  I've noticed that
0.8 has several bin/*topic.sh scripts, while trunk has as single bin/kafka-topics.sh, which
uses the TopicCommand class.

If you are discussing support for delete-topics in 0.8, perhaps the TopicCommand class and
script that trunk has should be merged into 0.8 sooner rather than later?  (I'm really only
mentioning this because TopicCommand makes my wrapper script a bit simpler. :) )

-Andrew Otto





On Aug 23, 2013, at 5:28 PM, Jay Kreps <jay.kreps@gmail.com> wrote:

> I mean I think the meta point Neha is making, is that clearly we need
> tooling support for topic deletion. We just haven't done it yet. This is
> kind of silly but works okay for us temporarily (we don't really delete
> topics).
> 
> -Jay
> 
> 
> On Fri, Aug 23, 2013 at 2:22 PM, Yu, Libo <libo.yu@citi.com> wrote:
> 
>> Here is the list of paths that should be deleted:
>> /brokers/topics/my_topic
>> /consumers/[groupId]/owners/my_topic
>> /consumers/[groupId]/offsets/my_topic (if the topic has been consumed)
>> Let me know if I miss anything. Thanks.
>> 
>> Regards,
>> 
>> Libo
>> 
>> 
>> -----Original Message-----
>> From: Neha Narkhede [mailto:neha.narkhede@gmail.com]
>> Sent: Friday, August 23, 2013 4:35 PM
>> To: users@kafka.apache.org
>> Subject: Re: delete a topic
>> 
>> You can either try using rmr on zookeeper client 3.4.x (./zkCli.sh rmr
>> /node) or write your own script that does a recursive delete -
>> https://issues.apache.org/jira/browse/ZOOKEEPER-729
>> 
>> Thanks,
>> Neha
>> 
>> 
>> On Fri, Aug 23, 2013 at 10:52 AM, Yu, Libo <libo.yu@citi.com> wrote:
>> 
>>> I will give it a try. I know how to delete log files. But to delete
>>> the zookeeper data, do I only need to run the delete script?
>>> 
>>> Regards,
>>> 
>>> Libo
>>> 
>>> 
>>> -----Original Message-----
>>> From: Neha Narkhede [mailto:neha.narkhede@gmail.com]
>>> Sent: Friday, August 23, 2013 1:43 PM
>>> To: users@kafka.apache.org
>>> Subject: Re: delete a topic
>>> 
>>> Without the proper functionality of delete topic, I'm not sure if
>>> deleting the zookeeper and kafka data just for that topic is enough or
>>> not. On the surface, this approach seems sufficient, but I'm not sure
>>> of all the consequences of doing that. Also, remember to bounce the
>>> entire cluster once you've deleted the zookeeper and kafka data for the
>> topic in question.
>>> 
>>> Can you give it a try and let us know how it went?
>>> 
>>> Thanks,
>>> Neha
>>> 
>>> 
>>> On Fri, Aug 23, 2013 at 10:15 AM, Yu, Libo <libo.yu@citi.com> wrote:
>>> 
>>>> Hi Neha,
>>>> 
>>>> One more questions. Assume I want to delete a topic. When you say
>>>> deleting zookeeper data and kafka data, do you mean deleting
>>>> zookeeper data and kafka data for ALL the topics or only for that
>>>> particular topic?
>>>> 
>>>> 
>>>> Regards,
>>>> 
>>>> Libo
>>>> 
>>>> 
>>>> -----Original Message-----
>>>> From: Neha Narkhede [mailto:neha.narkhede@gmail.com]
>>>> Sent: Friday, August 23, 2013 11:33 AM
>>>> To: users@kafka.apache.org
>>>> Subject: Re: delete a topic
>>>> 
>>>> By that, I meant bringing down all brokers, deleting zookeeper data
>>>> and kafka data and restarting the brokers. I suspect attempting a
>>>> delete topic might have caused something bad to happen on the ISR
>>>> side. It will be great if you can start clean and then see if the
>>>> ISR is
>>> still an issue.
>>>> 
>>>> Also, I filed a bug to include a tool that makes it easy to check
>>>> the replica lag and progress, while troubleshooting ISR membership
>>>> issues
>>>> -
>>>> https://issues.apache.org/jira/browse/KAFKA-1021
>>>> 
>>>> Thanks,
>>>> Neha
>>>> 
>>>> 
>>>> On Fri, Aug 23, 2013 at 6:34 AM, Yu, Libo <libo.yu@citi.com> wrote:
>>>> 
>>>>> Hi Neha,
>>>>> 
>>>>> "Wipe out the cluster" Do you mean you uninstall the cluster and
>>>>> reinstall it?
>>>>> Or you just delete all kafka data and zookeeper data for the cluster?
>>>>> This is not a blocking issue for us. Our blocking issue is that
>>>>> some broker will fall out of ISR and never get back to it. We have
>>>>> observed that from more that one clusters. I am not sure if it is
>>>>> related to the deleting issue.
>>>>> 
>>>>> Regards,
>>>>> 
>>>>> Libo
>>>>> 
>>>>> 
>>>>> -----Original Message-----
>>>>> From: Neha Narkhede [mailto:neha.narkhede@gmail.com]
>>>>> Sent: Thursday, August 22, 2013 5:01 PM
>>>>> To: users@kafka.apache.org
>>>>> Subject: Re: delete a topic
>>>>> 
>>>>> In production, we are not deleting topics yet. In test
>>>>> environments, if we have to delete topics, we wipe out the
>>>>> cluster. If this is a feature that most users are blocked on, I
>>>>> think it makes sense to prioritize
>> https://issues.apache.org/jira/browse/KAFKA-330.
>>>>> 
>>>>> Thanks,
>>>>> Neha
>>>>> 
>>>>> 
>>>>> On Thu, Aug 22, 2013 at 1:01 PM, Vadim Keylis
>>>>> <vkeylis2009@gmail.com>
>>>>> wrote:
>>>>> 
>>>>>> How do you guys delete a topic if such need arise?
>>>>>> 
>>>>>> 
>>>>>> On Thu, Aug 22, 2013 at 12:29 PM, Neha Narkhede
>>>>>> <neha.narkhede@gmail.com
>>>>>>> wrote:
>>>>>> 
>>>>>>> I mentioned this in a different thread. I think the
>>>>>> 0.8.0-beta1-candidate1
>>>>>>> includes the script, but we have removed it later. I think
>>>>>>> when we
>>>>>> publish
>>>>>>> 0.8-final, this should be resolved.
>>>>>>> 
>>>>>>> Thanks,
>>>>>>> Neha
>>>>>>> 
>>>>>>> 
>>>>>>> On Thu, Aug 22, 2013 at 12:24 PM, Neha Narkhede
>>>>>>> <neha.narkhede@gmail.com
>>>>>>>> wrote:
>>>>>>> 
>>>>>>>> Vadim,
>>>>>>>> 
>>>>>>>> The JIRA tracking this feature is
>>>>>>>> https://issues.apache.org/jira/browse/KAFKA-330.
>>>>>>>> Until we have this feature, we should remove any scripts
>>>>>>>> that give the impression of deleting a topic, as Jay
>>>>>>>> suggested. I tried looking under bin/ but couldn't find any
>>>>>>>> delete topic or partition
>>>>> script.
>>>>>>>> 
>>>>>>>> Can you tell us which script you are using?
>>>>>>>> 
>>>>>>>> Thanks,
>>>>>>>> Neha
>>>>>>>> 
>>>>>>>> 
>>>>>>>> On Thu, Aug 22, 2013 at 11:40 AM, Vadim Keylis
>>>>>>>> <vkeylis2009@gmail.com
>>>>>>>> wrote:
>>>>>>>> 
>>>>>>>>> Jay or Neha. What is the process of deleting the topic
if
>>>>>>>>> the script included in the repository creates false
>> impression?
>>>>>>>>> 
>>>>>>>>> Thanks,
>>>>>>>>> Vadim
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> On Thu, Aug 22, 2013 at 11:14 AM, Jay Kreps
>>>>>>>>> <jay.kreps@gmail.com>
>>>>>>> wrote:
>>>>>>>>> 
>>>>>>>>>> We should really remove the delete script from 0.8
if we
>>>>>>>>>> plan to
>>>>>>> release
>>>>>>>>>> without delete support. Right now it appears to work
but
>>>>>>>>>> doesn't
>>>>>> which
>>>>>>>>> is
>>>>>>>>>> clearly not good.
>>>>>>>>>> 
>>>>>>>>>> -Jay
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> On Thu, Aug 22, 2013 at 10:57 AM, Neha Narkhede <
>>>>>>>>> neha.narkhede@gmail.com
>>>>>>>>>>> wrote:
>>>>>>>>>> 
>>>>>>>>>>> We currently don't have the delete topic feature
in
>>>>>>>>>>> Kafka 0.8. So
>>>>>>> any
>>>>>>>>>>> manual attempts to do so might have a negative
impact
>>>>>>>>>>> on
>>>>>>>>> functionality.
>>>>>>>>>>> 
>>>>>>>>>>> Thanks,
>>>>>>>>>>> Neha
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> On Thu, Aug 22, 2013 at 10:30 AM, Yu, Libo
>>>>>>>>>>> <libo.yu@citi.com>
>>>>>>> wrote:
>>>>>>>>>>> 
>>>>>>>>>>>> Hi team,
>>>>>>>>>>>> 
>>>>>>>>>>>> When I delete a topic, the topic is deleted
from
>>>>>>>>>>>> zookeeper but
>>>>>> its
>>>>>>>>> log
>>>>>>>>>>>> files are not deleted from Brokers.
>>>>>>>>>>>> 
>>>>>>>>>>>> When I restart a  broker, the broker will
try to sync
>>>>>>>>>>>> the log
>>>>>>> files
>>>>>>>>>> whose
>>>>>>>>>>>> topic has been deleted.
>>>>>>>>>>>> Manually deleting the log files will resolve
the issue.
>>>>>>>>>>>> Should
>>>>>>>>> broker
>>>>>>>>>>>> ignore log files whose topic has been deleted?
>>>>>>>>>>>> 
>>>>>>>>>>>> Regards,
>>>>>>>>>>>> 
>>>>>>>>>>>> Libo
>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>> 
>>>>>> 
>>>>> 
>>>> 
>>> 
>> 


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