Created: 2018-04-02 Mon 15:17
This is an example of how partitions look like, so each partition is simply an ordered, immutable sequence of records that is continually appended to.
Each record has assigned an offset in the form of a sequential id, that it's used to reference to it univocally.
An important thing to keep in mind is that Kafka will store all your records forever, but it will enforce a retention period, which is the number of days something is available to be consumed. This allows to have constant time performances independently by the amount of total data currently stored.