Apache Pulsar 1.21.0 已发布，不过目前仍处于孵化项目阶段。这是 Pulsar 成为 Apache 基金会的孵化项目后发布的第三个版本。
1.21.0-incubating 的主要变更
Upgrade to Netty 4.1
Publish the shaded pulsar-client as the default dependency
Enhancements to Kafka API wrapper to have it work with Kafka's own benchmark tools
Fix to C++ partitioned consumer client
Several fixes and improvements related to the namespace bundles
Allow consumer to seek to message id from within Pulsar client
PIP-8: Scale Pulsar beyond 1M topics
Enable secure replication over TLS
Upgrade to bk-4.3.1.83-yahoo to expose journalSyncData option
Prevent message duplication when active consumer is changed
完整的变更列表：https://github.com/apache/incubator-pulsar/milestone/10?closed=1
下载地址
https://pulsar.incubator.apache.org/download/
Pulsar是一个高度可扩展，低延迟的分布式消息发布/订阅传递平台，具有非常灵活地消息模型和一个直观的客户端API。
下载地址：https://github.com/apache/incubator-pulsar/releases/download/v1.21.0-incubating/apache-pulsar-1.21.0-incubating-bin.tar.gz
来自:开源中国社区
