Highlights of Apache Pulsar 2.10.0 Release: New Features and Bug Fixes

Apache Pulsar 2.10.0 has been released, incorporating contributions from 99 developers, over 800 changes, and a range of new features beyond the previously introduced ZooKeeper reduction and automated cluster failover.

Version Highlights include automatic failover between primary and backup clusters (PR‑13316), lazy loading for PartitionedProducer to reduce broker memory usage (PR‑10279), and a new TableView type for topic mapping based on message keys (PR‑12838).

Bug Fixes and Enhancements are grouped by component. The Java client now supports cluster‑level automatic failover, cross‑cluster topic policies, and a replicateTo attribute for local policies. Producers gain delayed loading for partitioned producers and a new ChunkMessage‑ID type with helper methods getFirstChunkMessageId and getLastChunkMessageID . Brokers receive an extended BrokerInterceptor interface and a new MessagePayloadProcessor for ledger read/write interception.

Consumers see epoch‑based redelivery synchronization, an entry‑filter framework, dead‑letter subscription initialization, and redelivery back‑off strategies for ack timeouts, including additions to RedeliveryBackoff and NegativeAckBackoff . Function enhancements introduce a RichFunction interface with setup and tearDown APIs, and asynchronous authentication methods such as AuthenticationProvider#authenticateAsync and AuthenticationProvider#authenticateHttpRequestAsync .

Topic improvements add metadata support with new storage methods and REST API paths. Metadata storage now includes an Etcd implementation offering batch reads/writes, session watches, and lease management.

Overall, the release provides significant operational, performance, and developer‑experience enhancements for Pulsar users.