What's new in Git 2.45.0?

Git Version 2.45.0 introduces a new "reftable" backend for storing references, addressing scalability issues in large repositories that the existing "files" format struggled with, such as inefficient reference deletion and inability to perform atomic read/write operations. The "reftable" format, initially proposed by Shawn Pearce and implemented in JGit, offers a binary format for references and is now integrated into Git, allowing users to opt for this backend when initializing or cloning repositories. Despite its advantages, the "reftable" format presents challenges in data accessibility, necessitating new tools and commands to manage references and reflogs effectively. This update also includes enhancements in reference packing efficiency, particularly benefiting the "reftable" backend through a new auto-compaction mode. The release is supported by contributions from both GitLab's Git team and the broader Git community, with additional performance improvements and bug fixes accompanying these major changes.

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