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Kafka, mail # user - auto-delete empty, old topics?


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Re: auto-delete empty, old topics?
Jason Rosenberg 2013-03-07, 00:21
Thanks Neha,

I added a comment to that ticket.

Another question, I'm not sure if the behavior is different in 0.8 from
0.7.  But currently, I'm not predeclaring topics, before sending messages
to topics.  The topics get automagically created if they don't exist.  Will
that still exist in 0.8?  If so, it should also be automatic (using a
default expiration for all such topics), that they automagically go away
after no longer being in use.

What's the procedure for deleting topics in kafka 0.7.2?

Jason

On Wed, Mar 6, 2013 at 3:38 PM, Neha Narkhede <[EMAIL PROTECTED]>wrote:

> We plan to include support for deleting topics before the official release.
> The JIRA tracking this feature is
> https://issues.apache.org/jira/browse/KAFKA-330
>
> This is mainly an admin tool and is proposed to be run manually. I think
> your suggestion is to set some sort of expiration time on topics so when
> all data gets garbage collected and the expiration time lapses, the topic
> is automatically deleted.
>
> For this expiration to work, we need some mechanism of knowing the size of
> the data logs for that topic on all brokers. And only when its empty for
> all partitions of that topic, we delete it. This requires some API that
> will expose the data size of a topic on a broker, which we don't have right
> now. It might be worth thinking about it. Do you mind posting your
> suggestions for this tool on that JIRA ?
>
> Thanks,
> Neha
>
>
> On Wed, Mar 6, 2013 at 3:15 PM, Jason Rosenberg <[EMAIL PROTECTED]> wrote:
>
> > I suspect this is not currently supported, but it seems to be for us a
> real
> > use case.
> >
> > If we have a topic that is no longer receiving messages, and all messages
> > have been removed from the brokers, after the log_retention_hours has
> > expired, I'd love to have it then automatically remove the topic from
> > kafka.
> >
> > If subsequently a new message arrives for that topic, it could just
> > recreate the topic as originally, and continue on.
> >
> > Is this easy to implement?
> > Has it been requested?
> > Does it make sense?
> > Should I file a jira?
> >
> > Currently, we had a test client that inadvertently created 1000's of
> > topics.  The job of deleting all these appears to not be a cumbersome
> > manual process (are there any quick links to the recommended way for
> doing
> > this?).
> >
> > I am using 0.7.2, but will eventually upgrade to 0.8, once it's released
> to
> > beta....
> >
> > Thanks,
> >
> > Jason
> >
>