You set num.network.threads to 1 on a Kafka broker but notice slow message processing under load. What is the likely issue?

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Kafka - Performance Tuning

You set num.network.threads to 1 on a Kafka broker but notice slow message processing under load. What is the likely issue?

AThe batch size is too large.

BToo many network threads cause CPU overload.

CToo few network threads limit concurrent connections.

DThe retention period is too short.

Step-by-Step Solution

Solution:

Step 1: Understand num.network.threads role
This setting controls how many threads handle network requests concurrently.
Step 2: Analyze effect of setting it to 1
With only 1 thread, Kafka cannot handle many connections well, causing slow processing under load.
Final Answer:
Too few network threads limit concurrent connections. -> Option C
Quick Check:
Low network threads cause slow processing = A [OK]

Quick Trick: Low network threads limit concurrency, causing slow processing [OK]

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