Kafka - Cluster Architecture
Given the following code snippet, what will be the output if the current controller broker ID is 3?
var controllerId = adminClient.describeCluster().controller().get().id(); System.out.println(controllerId);
Given the following code snippet, what will be the output if the current controller broker ID is 3?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the code behavior
The code calls describeCluster().controller().get().id() which returns the controller broker ID synchronously.Step 2: Given controller ID is 3, output is 3
Since controller ID is 3, the printed output will be 3.Final Answer:
3 -> Option BQuick Check:
Output = controller ID value = 3 [OK]
Quick Trick: describeCluster().controller().get().id() returns controller ID synchronously [OK]
Common Mistakes:
- Expecting null if controller exists
- Assuming default 0 if no controller
- Thinking code throws exception without error
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