Apache Kafka Complete Practice Exam 2025 – All-in-One Prep

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What is one significant consequence of not allocating enough memory for the page cache in Kafka?

No effect on performance

Increased processing time

Not allocating enough memory for the page cache in Kafka can lead to increased processing time. The page cache, which is part of the operating system's memory management, is essential for efficiently reading and writing data to and from disk. When the page cache is under-provisioned, Kafka is forced to perform more disk I/O operations instead of leveraging cached data. Disk I/O is considerably slower than accessing data in memory, which causes delays in processing requests, ultimately resulting in longer response times for message delivery and consumption.

This increased dependency on disk access means that Kafka cannot efficiently handle the high throughput that it is designed for, leading to bottlenecks and increased latency in operations. A well-configured page cache allows Kafka to manage and process messages swiftly, maintaining optimal performance.

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Higher throughput

Decreased message retention

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