I'm looking at the kafka server.properties that is in /config folder and
didn't find any reference to topics or partitions.

Are topics and optionally partitions dynamic in nature or do they have to
be defined before starting the broker? (and consequently producers can't
send to a topic and partition that isn't predefined).

 

In Kafka 0.7, topics and partitions are dynamic in the sense that a
partition is created when the broker receives the first message for that
partition.
In Kafka 0.8, there are 2 ways of creating a new topic -
1. Turn on auto.create.topics.enable option on the broker. When the broker
receives the first message for a new topic, it creates that topic with
num.partitions and default.replication.factor.
2. Use the admin command bin/kafka-create-topic.sh

Thanks,
Neha
On Sun, Jan 27, 2013 at 12:23 PM, S Ahmed <[EMAIL PROTECTED]> wrote:

> I'm looking at the kafka server.properties that is in /config folder and
> didn't find any reference to topics or partitions.
>
> Are topics and optionally partitions dynamic in nature or do they have to
> be defined before starting the broker? (and consequently producers can't
> send to a topic and partition that isn't predefined).
>

 

So from what I understand, a single broker will contain all the messages
for a given topic (and its partitions).  Who decides which broker will own
a particular topic?
On Sun, Jan 27, 2013 at 3:36 PM, Neha Narkhede <[EMAIL PROTECTED]>wrote:

> In Kafka 0.7, topics and partitions are dynamic in the sense that a
> partition is created when the broker receives the first message for that
> partition.
> In Kafka 0.8, there are 2 ways of creating a new topic -
> 1. Turn on auto.create.topics.enable option on the broker. When the broker
> receives the first message for a new topic, it creates that topic with
> num.partitions and default.replication.factor.
> 2. Use the admin command bin/kafka-create-topic.sh
>
> Thanks,
> Neha
>
>
> On Sun, Jan 27, 2013 at 12:23 PM, S Ahmed <[EMAIL PROTECTED]> wrote:
>
> > I'm looking at the kafka server.properties that is in /config folder and
> > didn't find any reference to topics or partitions.
> >
> > Are topics and optionally partitions dynamic in nature or do they have to
> > be defined before starting the broker? (and consequently producers can't
> > send to a topic and partition that isn't predefined).
> >
>

 

In 0.8, when a topic is created, we decide how each replica of a partition
is mapped to a broker. In general, we try to spread the replicas across all
brokers.

Thanks,

Jun

On Sun, Jan 27, 2013 at 12:40 PM, S Ahmed <[EMAIL PROTECTED]> wrote:

> So from what I understand, a single broker will contain all the messages
> for a given topic (and its partitions).  Who decides which broker will own
> a particular topic?
>
>
> On Sun, Jan 27, 2013 at 3:36 PM, Neha Narkhede <[EMAIL PROTECTED]
> >wrote:
>
> > In Kafka 0.7, topics and partitions are dynamic in the sense that a
> > partition is created when the broker receives the first message for that
> > partition.
> > In Kafka 0.8, there are 2 ways of creating a new topic -
> > 1. Turn on auto.create.topics.enable option on the broker. When the
> broker
> > receives the first message for a new topic, it creates that topic with
> > num.partitions and default.replication.factor.
> > 2. Use the admin command bin/kafka-create-topic.sh
> >
> > Thanks,
> > Neha
> >
> >
> > On Sun, Jan 27, 2013 at 12:23 PM, S Ahmed <[EMAIL PROTECTED]> wrote:
> >
> > > I'm looking at the kafka server.properties that is in /config folder
> and
> > > didn't find any reference to topics or partitions.
> > >
> > > Are topics and optionally partitions dynamic in nature or do they have
> to
> > > be defined before starting the broker? (and consequently producers
> can't
> > > send to a topic and partition that isn't predefined).
> > >
> >
>

 

I am currently using kafka-0.8.0.  I don't see a reference to auto.create.topics.enable in server.properties.  Can you tell me if that is the file where I should be adding this property?  Also what are the acceptable values?  i.e 1,0,true,false, etc.

Thanks in advance
-Noel