Kafka is a vital part of data infrastructure in many organizations. When the Kafka cluster grows and more data is stored in Kafka for a longer duration, several issues related to scalability, efficiency, and operations become important to address. Kafka cluster storage is typically scaled by adding more broker nodes to the cluster. But this also adds needless memory and CPUs to the cluster making overall storage cost less efficient compared to storing the older data in external storage.
Tiered storage is introduced to extend Kafka's storage beyond the local storage available on the Kafka cluster by retaining the older data in cheaper stores, such as HDFS, S3, Azure or GCS with minimal impact on the internals of Kafka.
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