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Kafka Internals

Under Kafka characteristics it is mentioned
" Low Latency : 99.99% of the time, data is read from disk cache and RAM; very rarely, it hits the disk."
Can you please share the source for this which has detailed explanation for the same.?
thanks

@Sidharth_K, Taka a look at Confluent’s benchmarking results - https://www.confluent.io/blog/kafka-fastest-messaging-system/#latency-results