Setting up a Kafka cluster for a production environment is no trivial task. There are so many configurations, settings, and decisions to be taken that it’s quite difficult to understand all of them up front. …

In most simple words, Page caching is a mechanism used by Linux Kernal wherein instead of writing/reading directly from a secondary disk, it transparently reads and writes to and from the unused portions of RAM and thereby improving performance and decreasing the number of much slower disk IO operations. Amount of RAM currently used as page cache is indicated by the cache/buff column of the free -m command.