深度理解MySQL Group Replication的RECOVERING状态

+---------------------------+--------------------------------------+----------------------+-------------+--------------+ 3 rows in set (0.00 sec) mysql>

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去查看后台error log日志显示，刚开始启动，在做CHANGE MASTER TO FOR CHANNEL ‘group_replication_applier’ executed’的时候，没有取到值，然后看后面同步完后，就会执行加入组复制成员的命令

“CHANGE MASTER TO FOR CHANNEL 'group_replication_recovery' executed'.
 Previous state master_host='hch_test_web_1_24', master_port= 3317, master_log_file='', 
 master_log_pos= 4, master_bind=''. New state master_host='<NULL>', master_port= 0, master_log_file='', master_log_pos= 4, master_bind=''”，

在执行结束后，最后告诉我们“’This server was declared online within the replication group’”已经加入到了组成员，而且变成了实时的ONLINE状态：

2017-01-17T08:23:15.710146Z 4 [Note] Plugin group_replication reported: 'auto_increment_increment is reset to 1'
2017-01-17T08:23:15.710200Z 4 [Note] Plugin group_replication reported: 'auto_increment_offset is reset to 1'
2017-01-17T08:23:15.710401Z 20 [Note] Error reading relay log event for channel 'group_replication_applier': slave SQL thread was killed
2017-01-17T08:23:15.711212Z 17 [Note] Plugin group_replication reported: 'The group replication applier thread was killed'
2017-01-17T08:23:42.141239Z 4 [Note] Plugin group_replication reported: 'Group communication SSL configuration: group_replication_ssl_mode: "DISABLED"'
2017-01-17T08:23:42.141451Z 4 [Note] Plugin group_replication reported: '[GCS] Added automatically IP ranges 127.0.0.1/8,192.168.121.111/23 to the whitelist'
2017-01-17T08:23:42.141990Z 4 [Note] Plugin group_replication reported: '[GCS] Translated 'db2' to 192.168.121.111'
2017-01-17T08:23:42.142174Z 4 [Note] Plugin group_replication reported: '[GCS] SSL was not enabled'
2017-01-17T08:23:42.142220Z 4 [Note] Plugin group_replication reported: 'Initialized group communication with configuration: 
group_replication_group_name: "e4668cea-d7ca-11e6-86b5-18a99b76310d"; group_replication_local_address: "db2:24902"; 
group_replication_group_seeds: "db1:24901,db2:24902,db3:24903"; group_replication_bootstrap_group: false; 
group_replication_poll_spin_loops: 0; group_replication_compression_threshold: 1000000; group_replication_ip_whitelist: "AUTOMATIC"'
2017-01-17T08:23:42.142936Z 28 [Note] 'CHANGE MASTER TO FOR CHANNEL 'group_replication_applier' executed'. 
Previous state master_host='<NULL>', master_port= 0, master_log_file='', master_log_pos= 4, master_bind=''. 
New state master_host='<NULL>', master_port= 0, master_log_file='', master_log_pos= 4, master_bind=''.

-- #（1）尝试启动默认的组复制，结果信息不对称，启动失败，然后开始初始化Group Replication
2017-01-17T08:23:42.166956Z 31 [Note] Slave SQL thread for channel 'group_replication_applier' initialized, 
starting replication in log 'FIRST' at position 0, relay log './bpe_service-relay-bin-group_replication_applier.000019' position: 4
2017-01-17T08:23:42.166960Z 4 [Note] Plugin group_replication reported: 'Group Replication applier module successfully initialized!'
2017-01-17T08:23:42.167064Z 4 [Note] Plugin group_replication reported: 'auto_increment_increment is set to 7'
2017-01-17T08:23:42.167079Z 4 [Note] Plugin group_replication reported: 'auto_increment_offset is set to 12002'
2017-01-17T08:23:42.167219Z 0 [Note] Plugin group_replication reported: 'state 4257 action xa_init'
2017-01-17T08:23:42.167292Z 0 [Note] Plugin group_replication reported: 'Successfully bound to 0.0.0.0:24902 (socket=49).'
2017-01-17T08:23:42.167341Z 0 [Note] Plugin group_replication reported: 'Successfully set listen backlog to 32 (socket=49)!'
2017-01-17T08:23:42.167357Z 0 [Note] Plugin group_replication reported: 'Successfully unblocked socket (socket=49)!'
2017-01-17T08:23:42.167400Z 0 [Note] Plugin group_replication reported: 'connecting to db2 24902'
2017-01-17T08:23:42.167585Z 0 [Note] Plugin group_replication reported: 'Ready to accept incoming connections on 0.0.0.0:24902 (socket=49)!'
2017-01-17T08:23:42.174427Z 0 [Note] Plugin group_replication reported: 'client connected to db2 24902 fd 50'
2017-01-17T08:23:42.174807Z 0 [Note] Plugin group_replication reported: 'connecting to db2 24902'
2017-01-17T08:23:42.175008Z 0 [Note] Plugin group_replication reported: 'client connected to db2 24902 fd 63'
2017-01-17T08:23:42.175234Z 0 [Note] Plugin group_replication reported: 'connecting to db2 24902'
2017-01-17T08:23:42.175411Z 0 [Note] Plugin group_replication reported: 'client connected to db2 24902 fd 65'
2017-01-17T08:23:42.175614Z 0 [Note] Plugin group_replication reported: 'connecting to db2 24902'
2017-01-17T08:23:42.175799Z 0 [Note] Plugin group_replication reported: 'client connected to db2 24902 fd 67'
2017-01-17T08:23:42.176006Z 0 [Note] Plugin group_replication reported: 'connecting to db2 24902'
2017-01-17T08:23:42.176176Z 0 [Note] Plugin group_replication reported: 'client connected to db2 24902 fd 69'
2017-01-17T08:23:42.176377Z 0 [Note] Plugin group_replication reported: 'connecting to db2 24902'
2017-01-17T08:23:42.176563Z 0 [Note] Plugin group_replication reported: 'client connected to db2 24902 fd 71'
2017-01-17T08:23:42.176876Z 0 [Note] Plugin group_replication reported: 'connecting to db1 24901'
2017-01-17T08:23:42.177312Z 0 [Note] Plugin group_replication reported: 'client connected to db1 24901 fd 73'
2017-01-17T08:23:43.463474Z 0 [Note] Plugin group_replication reported: 'state 4257 action xa_snapshot'
2017-01-17T08:23:43.463969Z 0 [Note] Plugin group_replication reported: 'new state x_recover'
2017-01-17T08:23:43.464000Z 0 [Note] Plugin group_replication reported: 'state 4277 action xa_complete'
2017-01-17T08:23:43.464275Z 0 [Note] Plugin group_replication reported: 'new state x_run'
2017-01-17T08:23:44.619112Z 0 [Note] Plugin group_replication reported: 'Starting group replication recovery with view_id 14844510167669342:17' 

--#（2） 开始进行组内数据recovery
2017-01-17T08:23:44.619451Z 34 [Note] Plugin group_replication reported: 'Establishing group recovery connection with a possible donor. Attempt 1/10'
2017-01-17T08:23:44.624181Z 34 [Note] 'CHANGE MASTER TO FOR CHANNEL 'group_replication_recovery' executed'. Previous state master_host='<NULL>', 
master_port= 0, master_log_file='', master_log_pos= 4, master_bind=''. New state master_host='hch_test_web_1_24', master_port= 3317, 
master_log_file='', master_log_pos= 4, master_bind=''.
2017-01-17T08:23:44.628853Z 34 [Note] Plugin group_replication reported: 'Establishing connection to a group replication
 recovery donor 664b9ce9-d7de-11e6-9e8c-18a99b763071 at hch_test_web_1_24 port: 3317.'
2017-01-17T08:23:44.629156Z 35 [Warning] Storing MySQL user name or password information in the master info repository is not secure and
 is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax'
  in the MySQL Manual for more information.
2017-01-17T08:23:44.635870Z 36 [Note] Slave SQL thread for channel 'group_replication_recovery' initialized, starting
 replication in log 'FIRST' at position 0, relay log './bpe_service-relay-bin-group_replication_recovery.000001' position: 4
2017-01-17T08:23:44.681897Z 35 [Note] Slave I/O thread for channel 'group_replication_recovery': 
connected to master 'repl@hch_test_web_1_24:3317',replication started in log 'FIRST' at position 4
2017-01-17T08:43:34.219952Z 34 [Note] Plugin group_replication reported: 'Terminating existing group replication donor connection and 
purging the corresponding logs.'
2017-01-17T08:43:34.220609Z 36 [Note] Slave SQL thread for channel 'group_replication_recovery' exiting, 
replication stopped in log 'binlog.000042' at position 185511578
2017-01-17T08:43:34.226869Z 35 [Note] Slave I/O thread killed while reading event for channel 'group_replication_recovery'
2017-01-17T08:43:34.226886Z 35 [Note] Slave I/O thread exiting for channel 'group_replication_recovery', read up to log 'binlog.000042', position 185511578
2017-01-17T08:43:34.269973Z 34 [Note] 'CHANGE MASTER TO FOR CHANNEL 'group_replication_recovery' executed'. 
Previous state master_host='hch_test_web_1_24', master_port= 3317, master_log_file='',
 master_log_pos= 4, master_bind=''. New state master_host='<NULL>', master_port= 0, master_log_file='', master_log_pos= 4, master_bind=''.

-- # （3）已经数据恢复完成，加入组，成为组成员
2017-01-17T08:43:34.290920Z 0 [Note] Plugin group_replication reported: 'This server was declared online within the replication group'

小结：mysql group replication的使用来说，有些理念比如mongodb的分片以及primary-secondary的思路理念可以参考下，这样理解起来就会比较容易一些。

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