ChangeLog

2.0.5
*连接失败时将unknown状态的DB置为down
*将COM_SET_OPTION优先发往从库
*从admin.lua里移除uuid和connected_clients

2.0.4
*修正SET CHARACTER_[CLIENT|RESULTS|CONNECTION]的bug

2.0.3
*支持客户端在连接时指定默认字符集

2.0.2
*检测线程只检测状态为down的DB
*处于事务状态的客户端退出时，Atlas销毁该客户端使用的连接

2.0.1
*Java不能接受handshake包的随机串内包含负数，将随机串的每个字节的范围限定为[1,127]

2.0.0
*实现了Atlas自行向DB建立连接，而不再依赖客户端的连接动作，并且把连接池由队列结构改为栈结构，带来的好处：
	**支持了长连接
	**不再需要min-idle-connections参数
	**连接池内的连接数可随着客户端并发量的上升而增长，且在并发量下降后自动销毁多余连接(依靠DB的wait_timeout)
*SQL日志增加了开关，可以设为关闭(OFF)、打开(ON)、实时(REALTIME)三种，默认为OFF，REALTIME用于观察调试
	**OFF代表不记录SQL日志
	**ON代表记录SQL日志，由操作系统定期写入磁盘
	**REALTIME代表记录SQL日志，每记录一条都实时写入磁盘
*启动脚本修改，在启动失败时可以报出错误信息
*去除了配置文件的mode必须低于660的限制
*检测线程不再将DB状态设为down，而是只在DB恢复后将其状态设为up，以此避免网络抖动引发的误将DB下线操作，减少无谓的lost connection
*修正管理接口无法识别含有多个空格的语句的bug
*去除全局保存的con结构队列，提升性能
*不再判断is_insert_id，提升性能

0.7.0 - 

  chassis
  * added a error-msg if trailing options without dashes are specified
  * added config-file support that maps cmdline options to configfile options
  * added support for SIGHUP to reopen logfiles
  * added win32-service support
  * added --basedir
  * added experimental --log-backtrace-on-crash
  * added DTrace probes
  * added a angel to keep the chassis alive
  * added --user option to change the system user the proxy runs as

  proxy-core
  * added buffered IO on unix
  * added lua-scope that is shared between the plugins
  * added a option to disable COM_CHANGE_USER on connection reuse
  * added handling of the 4.0 auth packets
  * added parser for master.info files
  * replaced assertions in protocol decoders by proper error-codes
  * fixed assertions when COM_TIME, COM_PROCESS_INFO or COM_DEBUG are received

  lua layer
  * added unit-testing for the lua scripts
  * fixed tutorial-inject.lua to start indexing at 1 (#32088)
  * expose chassis_log_* functions to lua
  * added the posix and lpeg module from luaforge
  * use the LPEG lua-module to parse statements
  * added memory profiling
  * added { resultset_is_needed = false } as default
  * moved proxy.backends.* to proxy.global.backends.*
  * added a lua-wrapper around some glib-2.0 functions
  * added a script cache
  * removed explicit call to lua_gc() to improve the speed

  Proxy Plugin
  * track rows and bytes of a resultset
  * fixed quoting of SQL commands like COMMIT and ROLLBACK
  * added test-cases for connection-pooling, fail-over, ...
  * refactored the SQL tokenizer into a lua module
  * fixed handling -- comments in the SQL tokenizer
  * fixed backend state cache

  Admin Plugin
  * replaced the hardcoded admin commands by a lua script interface
  * added authentication support

  Debug Plugin
  * return "number" as DOUBLE or INTs