Thanks David,
Hmm, is the property create.topic.policy.class.name set in
server.properties at all?
Cheers,
Liam
On Wed, Nov 10, 2021 at 12:21 PM David Ballano Fernandez <
dfernan...@demonware.net> wrote:
> Hi Liam,
>
> I did a test creating topics with kafka-topics.sh and admin API from
> confluent kafka python.
> The same happened for both.
>
> thanks!
>
> On Tue, Nov 9, 2021 at 2:58 PM Liam Clarke-Hutchinson <lclar...@redhat.com
> >
> wrote:
>
> > Hi David,
> >
> > What tool(s) are you using to create new topics? Is it the
> kafka-topics.sh
> > that ships with Apache Kafka?
> >
> > Cheers,
> >
> > Liam Clarke-Hutchinson
> >
> > On Wed, Nov 10, 2021 at 11:41 AM David Ballano Fernandez <
> > dfernan...@demonware.net> wrote:
> >
> > > Hi All,
> > > Trying to figure out why my brokers have some disk imbalance I have
> found
> > > that Kafka (maybe this is the way it is supposed to work?) is not
> > spreading
> > > all replicas to all available brokers.
> > >
> > > I have been trying to figure out how a topic with 5 partitions with
> > > replication_factor=3 (15 replicas) could endup having all replicas
> > spread
> > > over 9 brokers instead of 15, especially when there are more brokers
> than
> > > the total replicas for that specific topic.
> > >
> > > cluster has 48 brokers.
> > >
> > > # topics.py describe -topic topic1
> > > {145: 1, 148: 2, *101: 3*, 146: 1, 102: 2, 147: 1, 103: 2, 104: 2, 105:
> > 1}
> > > the keys are the brokerid and the values is how many replicas they
> have.
> > >
> > > As you can see brokerid 101 has 3 replicas. which make the disk
> > unbalanced
> > > compared to other brokers.
> > >
> > > I created a brand new topic in a test cluster with 24 brokers. topic
> has
> > 5
> > > partitions with replication factor 3
> > > topics.py describe -topic test
> > > {119: 1, 103: 1, 106: 2, 109: 1, 101: 2, 114: 1, 116: 2, 118: 1, 111:
> 2,
> > > 104: 1, 121: 1}
> > >
> > > This time kafka decided to spread the replicas over 11 brokers instead
> of
> > > 15.
> > > just for fun i ran a partition reassignment for topic test, spreading
> > all
> > > replicas to all brokers, result:
> > >
> > > # topics.py describe -topic test
> > > {110: 1, 111: 1, 109: 1, 108: 1, 112: 1, 103: 1, 107: 1, 105: 1, 104:
> 1,
> > > 106: 1, 102: 1, 118: 1, 116: 1, 113: 1, 117: 1}
> > >
> > > Now all replicas are spread across 15 brokers.
> > >
> > > Is there something I am missing? Maybe the reason is to keep network
> > > chatter down?. By the way, I don't have any rack awareness configured.
> > > Thanks!
> > >
> >
>
