[Solved] Given the following code snippet using Kafka AdminClient in Java, what will controllerId hold after execution?AdminClient admin = AdminClient.create(props); Node controller = admin.describeCluster().... | Kafka

Kafka - Cluster Architecture

Given the following code snippet using Kafka AdminClient in Java, what will controllerId hold after execution?

AdminClient admin = AdminClient.create(props);
Node controller = admin.describeCluster().controller().get();
int controllerId = controller.id();
admin.close();

AThe total number of brokers in the cluster

BThe topic partition count

CThe port number of the controller broker

DThe broker ID of the current controller broker

Step-by-Step Solution

Solution:

Step 1: Analyze AdminClient describeCluster method
The describeCluster().controller() returns the current controller broker as a Node object.
Step 2: Understand Node.id()
The id() method returns the broker ID of that Node, which is the controller broker's ID.
Final Answer:
The broker ID of the current controller broker -> Option D
Quick Check:
controller().id() = controller broker ID [OK]

Quick Trick: controller().id() returns controller broker's ID [OK]

Common Mistakes:

Confusing controller ID with number of brokers
Thinking it returns port or partition count
Ignoring the blocking get() call

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More Kafka Quizzes

Given the following code snippet using Kafka AdminClient in Java, what will controllerId hold after execution?

Step 1: Analyze AdminClient describeCluster method

Step 2: Understand Node.id()

Final Answer:

Quick Check:

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