[Solved] Why does TopologyTestDriver not require bootstrap servers in its Properties configuration? — Ans: Because it runs the topology logic in-memory without connecting to Kafka brokers | Kafka

Kafka - Advanced Stream Processing

Why does TopologyTestDriver not require bootstrap servers in its Properties configuration?

ABecause it automatically connects to a default local Kafka cluster

BBecause it runs the topology logic in-memory without connecting to Kafka brokers

CBecause bootstrap servers are only needed for producers, not streams

DBecause it uses a mock network to simulate Kafka brokers

Step-by-Step Solution

Solution:

Step 1: Understand TopologyTestDriver architecture
It executes Kafka Streams logic entirely in-memory, no network or brokers involved.
Step 2: Analyze options
Only Because it runs the topology logic in-memory without connecting to Kafka brokers correctly explains why bootstrap servers are unnecessary; others describe incorrect or fictional behaviors.
Final Answer:
Because it runs the topology logic in-memory without connecting to Kafka brokers -> Option B
Quick Check:
In-memory execution means no bootstrap servers needed [OK]

Quick Trick: In-memory tests don't need Kafka broker addresses [OK]

Common Mistakes:

MISTAKES

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Why does TopologyTestDriver not require bootstrap servers in its Properties configuration?