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Your Kafka cluster has four brokers. The topic t1 on the cluster has two partitions, and it has a replication factor of three. You create a Consumer Group with four consumers, which subscribes to t1.
In the scenario above, how many Controllers are in the Kafka cluster?
Suggested Answer: A
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In a Kafka cluster, only one broker acts as the Controller at any given time. The Controller is responsible for managing cluster metadata, such as partition leadership and broker status. Even if the cluster has multiple brokers (in this case, four), only one is elected as the Controller, and others serve as regular brokers. If the current Controller fails, another broker is automatically elected to take its place.
37 comments · newest first
EL
Eloisa
10 months ago
I’m pretty sure it’s one too, but I’m still learning!
SH
Sheron
10 months ago
Yup, one Controller manages the whole cluster.
LO
Lorenza
10 months ago
Totally agree, it’s always just one!
ST
Stevie
10 months ago
Wait, I thought there could be more than one?
CI
Ciara
11 months ago
There’s only one Controller in a Kafka cluster.
JE
Jerlene
11 months ago
I feel like I read that there can only be one active Controller at a time, but I’m not 100% confident about that.
SO
Sophia
11 months ago
This question seems familiar. I practiced one where it asked about the number of partitions and replicas, but I don’t recall the Controller part clearly.
AN
Annabelle
11 months ago
I’m not entirely sure, but I remember something about Controllers being unique in a cluster. So maybe it’s A?
JE
Jeanice
12 months ago
I think there’s only one Controller in a Kafka cluster, right? It manages the brokers and partitions.
LO
Loise
12 months ago
This is a tricky one. I know the Controller is responsible for managing the cluster, but I'm not sure if the number of brokers, partitions, or consumers has any bearing on the number of Controllers. I'll have to think about this a bit more before answering.
SH
Shad
12 months ago
Okay, let me think this through. The number of brokers, partitions, and consumers doesn't seem directly relevant to the number of Controllers. I believe there is typically only one active Controller in a Kafka cluster, so I'll go with option A.
JO
Jose
1 year ago
Hmm, I'm a bit confused on this one. The question mentions a topic with two partitions and a replication factor of three, as well as a Consumer Group with four consumers. I'm not sure how those details relate to the number of Controllers in the cluster.
OC
Octavio
1 year ago
I think the key here is understanding the role of the Controller in a Kafka cluster. Since the question mentions a cluster with four brokers, my guess is that there would be one Controller managing the cluster.
MA
Madelyn
1 year ago
Alright, let's see here... If there are four brokers and the topic has a replication factor of three, then the number of Controllers must be B) two. It's simple math, really. Or is it? *laughs nervously*
AV
Avery
1 year ago
Oh, I see. Thanks for the clarification!
CA
Camellia
1 year ago
Yes, that's correct. The number of Controllers in the Kafka cluster is two.
IS
Isaac
1 year ago
I think the answer is B) two.
GA
Gabriele
1 year ago
I'm stumped. Is the answer A) One? Or maybe it's C) three? Kafka is such a mind-bending technology, it's no wonder they're paying us so much to figure it out.
MO
Mozell
1 year ago
B) two
TR
Trevor
1 year ago
A) One
JA
Jade
1 year ago
B) two
BE
Bettina
1 year ago
A) One
ED
Edna
1 year ago
This question is a piece of cake! The answer is clearly B) two. How else would the Kafka cluster have a replication factor of three with only four brokers?
ST
Stephania
1 year ago
D) Four? Really? That can't be right. I'm confident the answer is B) two, just like Diane said.
JO
Jolanda
1 year ago
B) two
RE
Reed
1 year ago
A) One
MA
Maryanne
1 year ago
Hmm, I'm not sure about this one. I'll go with C) three, since there are four brokers and the replication factor is three.
DA
Darci
1 year ago
User 3: I'm going with D) Four
ME
Melita
1 year ago
User 2: I believe it's C) three
HO
Howard
1 year ago
User 1: I think the answer is A) One
PE
Pearlene
1 year ago
I agree with Hildred. The answer is D) Four because each broker can potentially be a Controller.
HI
Hildred
1 year ago
I believe the answer is D) Four because each broker can act as a Controller in case of failure.
LI
Linwood
1 year ago
I think the answer is A) One.
DI
Diane
1 year ago
I think the answer is B) two. The topic has a replication factor of three, so there must be three brokers, and one of them is the Controller.
JU
Judy
1 year ago
Oh, I see. Thanks for clarifying.
JA
Jackie
1 year ago
No, the correct answer is A) One.
DA
Dannette
1 year ago
I think the answer is B) two.