The Apache BookKeeper team is proud to announce Apache BookKeeper version

Apache BookKeeper is a scalable, fault-tolerant, and low-latency storage service optimized for
real-time workloads. It has been used for a fundamental service to build reliable services.
It is also the log segment store for Apache DistributedLog and the message store for Apache Pulsar.

This is the 16th release of the Apache BookKeeper.

The 4.9.0 release incorporates hundreds of bug fixes, improvements,
and features since previous major release, 4.8.0, which was released four months ago.
It is a new milestone in Apache BookKeeper community.

There are a few big changes around metadata management, such as refactoring ledger metatadata
in ledger handle to make it immutable, storing ledger metadata in binary format and a new metadata
driver implementation based on Etcd. Additionally, there are huge improvements around memory
management, tooling, and documentation.

For BookKeeper release details and downloads, visit:

BookKeeper 4.9.0 Release Notes are at:

We would like to thank the contributors that made the release possible.


The BookKeeper Team