RDS MYSQL(5.1/5.5) RELEASE NOTES_MySQL
RDS源码团队会不定期对线上MySQL（覆盖5.1、5.5）版本升级，修复最近一段时间用户遇到的bug，以及满足用户新的需求，如果是紧急bug或是安全漏洞，我们会第一时间修复掉，如果是某个客户碰到些比较紧急的bug，我们也会针对某个客户进行快速fixed，确保不影响到客户的业务运行。
2014年5月份，我们会进行新一轮的RDS MySQL版本升级和bug fixed，详细列表见下面：
新增特性：
feature：新增加archive和blackhole引擎支持
feature：引入双写机制严格保证数据不丢失。
feature：主备强一致性校验，确保主备数据完全一致。
主要bugfix：
bugfix：修复mysqlcheck处理带.符号表的出错bug。
bugfix：修复加索引类的大操作导致锁住其他任务，导致异常切换的bug。
bugfix： 修复tmp_table_size不够大的时候，导致count(distinct)结果错误地返回0的bug。
bugfix：修复在使用alter table重命名时，带有.字符的表重命名出错的bug。
optimization：semi-sync相关性能优化和bug修复。
bugfix： 如果column是bigint unsigned类型，在对这个column使用between and条件时，触发bug。
bugfix：用PREPARE在视图上创建视图会失败，修复此bug。
bugfix：对于field超长的情况下，slave在apply时异常,导致备库同步停止。
bugfix：使用MRG_MyISAM引擎导致级联复制的slave crash。
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