RethinkDB 2.2.1 发布，此版本是个 bug 修复版本，完全兼容 RethinkDB 2.2.0，Bug 修复列表：
Fixed a crash with the message "Guarantee failed: [found_hash_pair]" when runninggetAll queries (#5085)
rethinkdb export and rethinkdb dump now limit the number of subprocesses to reduce memory consumption (#4809)
Fixed a segmentation fault in orderBy.limit changefeeds (#5081)
Fixed a crash when using getAll with illegal keys (#5086)
r.uuid is now considered a deterministic operation if it is passed a single argument (#5092)
Fixed the "Task was destroyed but it is pending!" error when using the asyncioevent loop on Python (#5043)
下载：
https://github.com/rethinkdb/rethinkdb/archive/v2.2.1.zip
RethinkDB 设计用来存储 JSON 文档的分布式数据库，可通过简单操作实现多机分布式存储。支持表的联合和分组查询。
来自:开源中国社区
