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From Jun Rao <jun...@gmail.com>
Subject Re: auto-delete empty, old topics?
Date Fri, 15 Mar 2013 15:17:46 GMT
Could you check if the following path for a deleted topic exists in ZK? It
should have no children.

/brokers/topics/[topic]

If this is the case, try manually removing those paths from ZK (when the
brokers and the consumers are down).

Thanks,

Jun

On Thu, Mar 14, 2013 at 2:03 PM, Jason Rosenberg <jbr@squareup.com> wrote:

> Hi Neha,
>
> So I did this, but I still see the full list of topics (most of which have
> been deleted), in the consumer logs, e.g.:
>
> consumer.ZookeeperConsumerConnector -
> samsa-consumer-graphite_alg2.sjc1.square-1363290849309-2816c1cb Topics to
> consume = List(<a bazillion topics, most of which have been deleted listed
> here>)
>
> I select topics using the white list topic selector (using a wild-card
> pattern, etc.).
>
> Thoughts?
>
> Does zookeeper keep separate info for the consumer, that needs to be
> removed?
>
> Jason
>
> On Thu, Mar 7, 2013 at 10:20 PM, Neha Narkhede <neha.narkhede@gmail.com
> >wrote:
>
> > In Kafka 0.7.2, data log directory delete and then rolling restart will
> > work to get rid of the topic completely from zookeeper as well as the
> > broker.
> > This is because the broker registers the topics and partitions from its
> > data directory into zookeeper on startup.
> >
> > Thanks,
> > Neha
> >
> >
> > On Thu, Mar 7, 2013 at 9:13 PM, Jason Rosenberg <jbr@squareup.com>
> wrote:
> >
> > > Thanks Neha,
> > >
> > > So are you saying that on 0.7.2, to delete a topic I need only remove
> > it's
> > > data log directory from each broker, and the restart the brokers?  Is
> it
> > ok
> > > if it's a rolling restart?
> > >
> > > For some reason I thought I also had to do something on zookeeper
> servers
> > > too, to remove the topics.  Is that not true?
> > >
> > > Jason
> > >
> > > On Wed, Mar 6, 2013 at 6:07 PM, Neha Narkhede <neha.narkhede@gmail.com
> > > >wrote:
> > >
> > > > >> The topics get automagically created if they don't exist.  Will
> > > > that still exist in 0.8?
> > > >
> > > > In 0.8, this is controlled by the auto.create.topics.enable config on
> > the
> > > > brokers. If this is set to true, topics will be created when a topic
> > > > metadata request is sent for a new topic. This feature is provided to
> > aid
> > > > with the 0.7->0.8 migration tool and the mirror maker tools. These
> > tools
> > > > copy data for almost all topics from one cluster to the other, so
> auto
> > > > creating topics makes it much easier to migrate data between
> clusters.
> > > >
> > > > >> What's the procedure for deleting topics in kafka 0.7.2?
> > > >
> > > > There is no official way to delete a topic. You have to delete the
> data
> > > > directory and bounce the brokers to take note of that.
> > > >
> > > > Thanks,
> > > > Neha
> > > >
> > > >
> > > > On Wed, Mar 6, 2013 at 4:20 PM, Jason Rosenberg <jbr@squareup.com>
> > > wrote:
> > > >
> > > > > 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 <
> > neha.narkhede@gmail.com
> > > > > >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 <
> jbr@squareup.com>
> > > > > 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
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

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