What is TarMK?

TarMK is a persistence manager (a way of storing and retrieving data) used within the Apache Jackrabbit project, which is the foundation for content repositories like Adobe Experience Manager (AEM). TarMK stores content in a custom file format optimized for fast read access, making it suitable for content-centric applications. It's an alternative to other persistence managers like MongoDB (used in AEM with DocumentMK), offering different performance characteristics and trade-offs, primarily favoring read performance over write performance and lower operational complexity compared to document-based storage. Its primary advantage lies in its simple file-based architecture that simplifies backups and restores.