GA与RC的区别

Release Candidate (aka Gamma) release发布候选版，也可以叫伽马版（阿尔法、贝塔）
Release Candidate binaries, also known as Gamma releases, are believed stable, having passed all of MySQL’s internal testing, and with all known fatal runtime bugs fixed. However this release has not been in widespread use long enough to know for sure that all bugs have been identified.

Generally Available (aka Production) release一般有效版，也可以叫产品
Generally Available (GA), also know as Production releases, are stable, having successfully passed through all earlier release stages and believed to be reliable, free of serious bugs, and suitable for use in production systems
RC被使用之后才能发布为GA