[Solved] Given the following Kafka cluster state, which broker will be the leader for partition 0? Broker 1:... Given the following Kafka cluster state, which broker will be the leader for partition 0? | Kafka

Kafka - Cluster Architecture

Given the following Kafka cluster state, which broker will be the leader for partition 0?

Broker 1: ISR = [1, 2, 3]
Broker 2: ISR = [1, 2, 3]
Broker 3: ISR = [1, 2, 3]
Current leader: Broker 2
Broker 2 fails

ABroker 2

BBroker 1

CBroker 3

DNo leader assigned

Step-by-Step Solution

Solution:

Step 1: Understand ISR and leader failover
ISR (In-Sync Replicas) are eligible leaders. When current leader fails, next ISR broker becomes leader.
Step 2: Identify next leader after Broker 2 fails
Broker 1 and 3 are in ISR. Kafka picks the lowest broker ID in ISR as new leader, so Broker 1.
Final Answer:
Broker 1 -> Option B
Quick Check:
Next leader = lowest ISR broker after failure [OK]

Quick Trick: Leader election picks lowest ISR broker if current leader fails [OK]

Common Mistakes:

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Given the following Kafka cluster state, which broker will be the leader for partition 0?