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!
> >
>
