Detailed introduction to the construction and deployment process of MySQL Group Replication[Single-Primary Mode]

1, AboutMySQL Group Replication

Group-based Replication (Group-basedReplication) is a method used in fault-tolerant systems technology in. Replication-group is composed of multiple servers (nodes) that can communicate with each other.

In the communication layer, Groupreplication implements a series of mechanisms: such as atomic message delivery and total ordering of messages.

These atomic and abstract mechanisms provide strong support for implementing more advanced database replication solutions.

MySQL Group Replication implements a multi-master, fully updated replication protocol based on these technologies and concepts.

In short, a Replication-group is a group of nodes. Each node can execute transactions independently, and read and write transactions will be coordinated with other nodes in the group before committing.

Therefore, when a transaction is ready to be submitted, it will automatically be atomically broadcast within the group to inform other nodes of what content has been changed/what transactions have been performed.

This atomic broadcast method keeps this transaction in the same order on every node.

This means that each node receives the same transaction log in the same order, so each node replays these transaction logs in the same order, and ultimately the entire group maintains a completely consistent state.

However, there may be resource contention between transactions executed on different nodes. This phenomenon easily occurs in two different concurrent transactions.

Suppose there are two concurrent transactions on different nodes that update the same row of data, then resource contention will occur.

Faced with this situation, GroupReplication determines that the transaction submitted first is a valid transaction and will be repeated in the entire group. The transaction submitted later will be directly interrupted, or rolled back, and finally discarded.

Therefore, this is also a shared-nothing replication scheme, and each node saves a complete copy of the data. See the following picture 01.png, which describes the specific workflow and can be compared with other solutions concisely. This replication scheme is, to some extent, similar to the Replication method of the database state machine (DBSM).

2, install mysql5.7.17

Official download, but the official only keeps the latest version. The url address 5.7.17 may not be valid for a long time, so it may not be necessary. I have kept it on Baidu Cloud Disk. The version is 5.7.17. You can go there at any time. Download and use,

Set /etc/hosts mapping on the three db servers, as follows:

Installed database server:

192.168.121.71 db1                                                                                                                                                    .111 db2            

192.168.121.24   db3

##/data/mysql/dataSet hostname and ip mappingCreate a replication account on db1/db2/db3:

GRANT REPLICATION SLAVE ON *.* TO  'repl'@'192.168.%' IDENTIFIED BY 'rlpbright_1927@ys';

#Database server address	Data Directory                                                                                                                   68.121.71(db1)	3317	##12001
192.168.121.111(db2)	3317	/data/mysql/data	12002
##192.168.121.24 (db3)	3317	/data/mysql/data	##12003
##3	, create a replication environment	Set on db1, db2, and db3 vim /etc/hosts 192.168.121.71 db1 hch_test_dbm2_121_71 192.168.121.111 db2 bpe_service 192.168.121.24 db3 hch_test_web_1_24

4, install

group replication

plug-in

Install the group replication plug-in on db1, db2, and db3 in sequence

mysql> INSTALL PLUGIN group_replication SONAME 'group_replication.so';                        
Query OK, 0 rows affected (0.01 sec)
 
mysql>

plugin-load=group_replication or configure it directly in the configuration file View group replication component

mysql> show plugins;
+----------------------------+----------+--------------------+----------------------+---------+
| Name                       | Status   | Type               | Library              | License |
+----------------------------+----------+--------------------+----------------------+---------+
| binlog                     | ACTIVE   | STORAGE ENGINE     | NULL                 | GPL     |
| mysql_native_password      | ACTIVE   | AUTHENTICATION     | NULL                 | GPL     |
| sha256_password            | ACTIVE   | AUTHENTICATION     | NULL                 | GPL     |
| MyISAM                     | ACTIVE   | STORAGE ENGINE     | NULL                 | GPL     |
| PERFORMANCE_SCHEMA         | ACTIVE   | STORAGE ENGINE     | NULL                 | GPL     |
| InnoDB                     | ACTIVE   | STORAGE ENGINE     | NULL                 | GPL     |
| INNODB_TRX                 | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_LOCKS               | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_LOCK_WAITS          | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_CMP                 | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_CMP_RESET           | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_CMPMEM              | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_CMPMEM_RESET        | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_CMP_PER_INDEX       | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_CMP_PER_INDEX_RESET | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_BUFFER_PAGE         | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_BUFFER_PAGE_LRU     | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_BUFFER_POOL_STATS   | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_TEMP_TABLE_INFO     | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_METRICS             | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_FT_DEFAULT_STOPWORD | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_FT_DELETED          | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_FT_BEING_DELETED    | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_FT_CONFIG           | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_FT_INDEX_CACHE      | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_FT_INDEX_TABLE      | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_SYS_TABLES          | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_SYS_TABLESTATS      | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_SYS_INDEXES         | ACTIVE   | INFORMATION SCHEMA | NULL              | GPL     |
| INNODB_SYS_COLUMNS         | ACTIVE   | INFORMATION SCHEMA | NULL               | GPL     |
| INNODB_SYS_FIELDS          | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_SYS_FOREIGN         | ACTIVE   | INFORMATION SCHEMA | NULL                | GPL     |
| INNODB_SYS_FOREIGN_COLS    | ACTIVE   | INFORMATION SCHEMA | NULL               | GPL     |
| INNODB_SYS_TABLESPACES     | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| INNODB_SYS_DATAFILES       | ACTIVE   | INFORMATION SCHEMA | NULL              | GPL     |
| INNODB_SYS_VIRTUAL         | ACTIVE   | INFORMATION SCHEMA | NULL                 | GPL     |
| MRG_MYISAM                 | ACTIVE   | STORAGE ENGINE     | NULL              | GPL     |
| MEMORY                     | ACTIVE   | STORAGE ENGINE     | NULL              | GPL     |
| CSV                        | ACTIVE   | STORAGE ENGINE     | NULL                 | GPL     |
| BLACKHOLE                  | ACTIVE   | STORAGE ENGINE     | NULL               | GPL     |
| partition                  | ACTIVE   | STORAGE ENGINE     | NULL             | GPL     |
| FEDERATED                  | DISABLED | STORAGE ENGINE     | NULL            | GPL     |
| ARCHIVE                    | ACTIVE   | STORAGE ENGINE     | NULL                 | GPL     |
| ngram                      | ACTIVE   | FTPARSER      | NULL      | GPL     |
| group_replication          | ACTIVE   | GROUP REPLICATION  | group_replication.so | GPL     |
+----------------------------+----------+--------------------+----------------------+---------+
45 rows in set (0.00 sec)
 
mysql>

my.cnf:

5
, configure group replicationparameters

Make sure

binlog_format

is

row

Format.

mysql> show variables like 'binlog_format';                                            
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| binlog_format | ROW   |
+---------------+-------+
1 row in set (0.00 sec)
 
mysql>

Two configuration methods, add OR configuration file online5.1Add online

Configuration:(1) The configuration commands are as follows, specific to a certain

db

The nodes will be adjusted, and most of the parameters are consistent:

set  @@global.transaction_write_set_extraction = XXHASH64;
 set @@global.group_replication_start_on_boot  = OFF;
 set  @@global.group_replication_bootstrap_group = OFF;
 set @@global.group_replication_group_name =  "0c6d3e5f-90e2-11e6-802e-842b2b5909d6";                                                                                                                          
 set @@global.group_replication_local_address  = 'db1:6606';
 set @@global.group_replication_group_seeds =  'db2:6607,db3:6608';

(2)

Indb1

The execution process is as follows:

mysql> set  @@global.transaction_write_set_extraction = XXHASH64;
Query OK, 0 rows affected (0.00 sec)
 
mysql> set  @@global.group_replication_start_on_boot = OFF;
Query OK, 0 rows affected (0.00 sec)
 
mysql> set  @@global.group_replication_bootstrap_group = OFF;
Query OK, 0 rows affected (0.00 sec)
 
mysql>
mysql>set @@global.group_replication_group_name  = "0c6d3e5f-90e2-11e6-802e-842b2b5909d7";                             
Query OK, 0 rows affected (0.00 sec)
 
mysql> set  @@global.group_replication_local_address = 'db1:6606';
Query OK, 0 rows affected (0.00 sec)
 
mysql> set  @@global.group_replication_group_seeds = 'db2:6607,db3:6608';
Query OK, 0 rows affected (0.00 sec)
 
mysql>

(3)

at

The execution process of db2

is as follows:

mysql>   set @@global.transaction_write_set_extraction = XXHASH64;
Query OK, 0 rows affected (0.00 sec)
 
mysql>   set @@global.group_replication_start_on_boot = OFF;
Query OK, 0 rows affected (0.00 sec)
 
mysql>   set @@global.group_replication_bootstrap_group = OFF;
Query OK, 0 rows affected (0.01 sec)
 
mysql>   set @@global.group_replication_group_name =  "0c6d3e5f-90e2-11e6-802e-842b2b5909d6";
Query OK, 0 rows affected (0.00 sec)
 
mysql>   set  @@global.group_replication_local_address = 'db2:6607';
Query OK, 0 rows affected (0.00 sec)
 
mysql>  set @@global.group_replication_group_seeds =  'db1:6606,db3:6608';
Query OK, 0 rows affected (0.01 sec)
 
mysql>

(4)

In

db3

The execution process is as follows:

mysql>   set @@global.transaction_write_set_extraction = XXHASH64 ;
Query OK, 0 rows affected (0.00 sec)
 
mysql>   set @@global.group_replication_start_on_boot = OFF;
Query OK, 0 rows affected (0.00 sec)
 
mysql>   set @@global.group_replication_bootstrap_group = OFF ;
Query OK, 0 rows affected (0.00 sec)
 
mysql>   set @@global.group_replication_group_name =  "0c6d3e5f-90e2-11e6-802e-842b2b5909d6";
Query OK, 0 rows affected (0.00 sec)
 
mysql>   set  @@global.group_replication_local_address = 'db3:6608'  ;
Query OK, 0 rows affected (0.00 sec)
 
mysql>   set @@global.group_replication_group_seeds  = 'db1:6606,db2:6607' ;
Query OK, 0 rows affected (0.00 sec)
 
mysql>

 

5.2配置文件配置

（1） db1上的my.cnf配置：

server-id=12001
transaction_write_set_extraction =  XXHASH64
loose-group_replication_group_name =  "5f847ff2-d701-11e6-819c-b8ca3af6e36c"                                                                                                                                                      
loose-group_replication_start_on_boot =  off
loose-group_replication_local_address  = "db1:23306"
loose-group_replication_group_seeds =  "db1:23306,db2:23307,db3:23308"
loose-group_replication_bootstrap_group =  off
loose-group_replication_single_primary_mode  = true
loose-group_replication_enforce_update_everywhere_checks  = false

 

（2）db2上的my.cnf配置：

server-id=12002
transaction_write_set_extraction = XXHASH64
loose-group_replication_group_name =  "5f847ff2-d701-11e6-819c-b8ca3af6e36c"
loose-group_replication_start_on_boot =  off
loose-group_replication_local_address  = "db2:23307"
loose-group_replication_group_seeds =  "db1:23306,db2:23307,db3:23308"
loose-group_replication_bootstrap_group =  off
loose-group_replication_single_primary_mode  = true
loose-group_replication_enforce_update_everywhere_checks  = false

 

（3）db3上的my.cnf配置：

server-id=12003
transaction_write_set_extraction =  XXHASH64
loose-group_replication_group_name =  "5f847ff2-d701-11e6-819c-b8ca3af6e36c"
loose-group_replication_start_on_boot =  off
loose-group_replication_local_address  = "db3:23308"
loose-group_replication_group_seeds =  "db1:23306,db2:23307,db3:23308"
loose-group_replication_bootstrap_group =  off
loose-group_replication_single_primary_mode  = true
loose-group_replication_enforce_update_everywhere_checks  = false

 

配置完后，重启3个db上的mysql服务，本次案例，我们选择5.2 配置文件配置方式实现。

6，启动mgr集群

开始构建group replication集群，通常操作命令

mysql>  CHANGE MASTER TO MASTER_USER='repl', MASTER_PASSWORD='rlpbright_1927@ys' FOR CHANNEL 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.02 sec)
 
mysql>

Db1上建立基本主库master库：

# 设置group_replication_bootstrap_group为ON是为了标示以后加入集群的服务器以这台服务器为基准，以后加入的就不需要设置。
mysql> SET GLOBAL group_replication_bootstrap_group = ON;
Query OK, 0 rows affected (0.00 sec)
 
mysql>  START GROUP_REPLICATION;
Query OK, 0 rows affected (1.03 sec)
 
mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| CHANNEL_NAME         | MEMBER_ID  | MEMBER_HOST          | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| group_replication_applier | 3d872c2e-d670-11e6-ac1f-b8ca3af6e36c | hch_test_dbm2_121_71 |   3317 | ONLINE  |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
1 row in set (0.00 sec)
 
mysql>

Db2上启动group_replication： 

Db2上mysql命令行上执行启动：
mysql>  START GROUP_REPLICATION;
Query OK, 0 rows affected (1.02 sec)
 
mysql>
 
db1上后台error log显示：
2017-01-10T07:37:39.946919Z 0 [Note] Plugin group_replication reported: 'getstart group_id 41e28b21'
2017-01-10T07:58:47.624090Z 0 [Note] Plugin group_replication reported: 'getstart group_id 41e28b21'
2017-01-10T07:58:53.116957Z 0 [Note] Plugin group_replication reported: 'Marking group replication view change with view_id 14840330835325176:6'
 
再去master库db1上，查看group_replication成员，会有db2的显示
mysql>  SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID   | MEMBER_HOST          | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| group_replication_applier | 3d872c2e-d670-11e6-ac1f-b8ca3af6e36c | hch_test_dbm2_121_71 |        3317 | ONLINE       |
| group_replication_applier | fdf2b02e-d66f-11e6-98a8-18a99b76310d | bpe_service          |        3317 | ONLINE       |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
2 rows in set (0.00 sec)
 
mysql>

Db3上启动group_replication：

-- Db3命令行上执行：
mysql> set global group_replication_allow_local_disjoint_gtids_join=ON;
Query OK, 0 rows affected (0.00 sec)
 
mysql> start group_replication;
Query OK, 0 rows affected (1.99 sec)
 
mysql>
 
-- 再去master库db1上，查看group_replication成员，会有db3的显示，而且已经是ONLINE了
mysql>  SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID    | MEMBER_HOST          | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| group_replication_applier | 3d872c2e-d670-11e6-ac1f-b8ca3af6e36c | hch_test_dbm2_121_71 |        3317 | ONLINE       |
| group_replication_applier | ef8ac2de-d671-11e6-9ba4-18a99b763071 | hch_test_web_1_24    |        3317 | ONLINE       |
| group_replication_applier | fdf2b02e-d66f-11e6-98a8-18a99b76310d | bpe_service          |        3317 | ONLINE       |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
3 rows in set (0.01 sec)
 
mysql>
 
-- db1上后台error log显示：
2017-01-10T08:00:28.866356Z 0 [Note] Plugin group_replication reported: 'getstart group_id 41e28b21'
2017-01-10T08:00:54.699130Z 0 [Note] Plugin group_replication reported: 'getstart group_id 41e28b21'
2017-01-10T08:00:56.567427Z 0 [Note] Plugin group_replication reported: 'Marking group replication view change with view_id 14840330835325176:9'

最后查看集群状态，都为ONLINE就表示OK：

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID   | MEMBER_HOST          | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| group_replication_applier | 3d872c2e-d670-11e6-ac1f-b8ca3af6e36c | hch_test_dbm2_121_71 |        3317 | ONLINE       |
| group_replication_applier | ef8ac2de-d671-11e6-9ba4-18a99b763071 | hch_test_web_1_24    |        3317 | ONLINE       |
| group_replication_applier | fdf2b02e-d66f-11e6-98a8-18a99b76310d | bpe_service          |        3317 | ONLINE       |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
3 rows in set (0.00 sec)
 
mysql>

7，验证集群复制功能

测试，在master库db1上建立测试库db1，测试表t1，录入一条数据

mysql> create database db1;
Query OK, 1 row affected (0.00 sec)
 
mysql> create table db1.t1(id int,cnvarchar(32));
Query OK, 0 rows affected (0.02 sec)
 
mysql>
mysql> insert into t1 select 1,'a';
ERROR 3098 (HY000): The table does notcomply with the requirements by an external plugin.
mysql>
mysql> insert into t1(id,cn)values(1,'a');
ERROR 3098 (HY000): The table does notcomply with the requirements by an external plugin.
mysql>
mysql>
-- # 这里原因是group_replaction环境下面，表必须有主键不然不允许往里insert值。所以修改表t1，将id字段设置程主键即可。
mysql> alter table t1 modify id intprimary key;
Query OK, 0 rows affected (0.02 sec)
Records: 0 Duplicates: 0  Warnings: 0
 
mysql> insert into t1 select 1,'a';
Query OK, 1 row affected (0.01 sec)
Records: 1 Duplicates: 0  Warnings: 0
 
mysql>

去db2/db3上可以看到数据已经同步过去

mysql> select * from db1.t1;
+----+------+
| id | cn  |
+----+------+
|  1| a    |
+----+------+
1 row in set (0.00 sec)
 
mysql>

然后在db2/db3上执行inert操作，则拒绝，因为db2、db3为readonly

mysql> insert into t1 select 2,'b';
ERROR 1290 (HY000): The MySQL server isrunning with the --super-read-only option so it cannot execute this statement
mysql>

8，问题记录

8.1问题记录一

MySQL窗口报错：

ERROR 3092 (HY000): The server is notconfigured properly to be an active member of the group. Please see moredetails on error log.
后台ERROR LOG报错：
[ERROR] Plugin group_replication reported:'This member has more executed transactions than those present in the group.
Local transactions: f16f7f74-c283-11e6-ae37-fa163ee40410:1 > Grouptransactions: 3c992270-c282-11e6-93bf-fa163ee40410:1,
 aaaaaa:1-5'
 [ERROR]Plugin group_replication reported: 'The member contains transactions notpresent in the group. The member will now exit the group.'
 [Note] Plugin group_replication reported: 'Toforce this member into the group you can use the group_replication_allow_local_disjoint_gtids_joinoption'

 

【解决办法】：

根据提示打开group_replication_allow_local_disjoint_gtids_join选项，mysql命令行执行：

mysql> set globalgroup_replication_allow_local_disjoint_gtids_join=ON;

再执行开启组复制：

mysql> start group_replication;
Query OK, 0 rows affected (7.89 sec)
 
mysql>

8.2 问题记录二RECOVERING  

在db1上查询集群组成员

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| CHANNEL_NAME     | MEMBER_ID     | MEMBER_HOST     | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| group_replication_applier | 3d872c2e-d670-11e6-ac1f-b8ca3af6e36c | hch_test_dbm2_121_71 |       3317 | ONLINE       |
| group_replication_applier | ef8ac2de-d671-11e6-9ba4-18a99b763071 | hch_test_web_1_24    |       3317 | RECOVERING   |
| group_replication_applier | fdf2b02e-d66f-11e6-98a8-18a99b76310d | bpe_service        |    3317 | RECOVERING   |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
3 rows in set (0.00 sec)
 
mysql>

再查看后台error日志，

2017-01-10T09:17:39.449488Z 146 [ERROR] Slave I/O for channel 'group_replication_recovery': 
error connecting to master 'repl@hch_test_dbm2_121_71:3317' - retry-time: 60  retries: 1, Error_code: 2003
2017-01-10T09:17:39.450289Z 146 [Note] Slave I/O thread for channel 'group_replication_recovery' killed while connecting to master
2017-01-10T09:17:39.450449Z 146 [Note] Slave I/O thread exiting for channel 'group_replication_recovery', read up to log 'FIRST', position 4
2017-01-10T09:17:39.451579Z 144 [ERROR] Plugin group_replication reported: 'There was an error when connecting to the donor server. 
Check group replication recovery's connection credentials.'
2017-01-10T09:17:39.452341Z 144 [Note] Plugin group_replication reported: 'Retrying group recovery connection with another donor. Attempt 2/10'
2017-01-10T09:17:39.457834Z 0 [Note] Plugin group_replication reported: 'Marking group replication view change with view_id 14840330835325176:25'
2017-01-10T09:18:39.456629Z 144 [Note] 'CHANGE MASTER TO FOR CHANNEL 'group_replication_recovery' executed'. 
Previous state master_host='hch_test_dbm2_121_71', master_port= 3317, master_log_file='', master_log_pos= 4, master_bind=''. 
New state master_host='hch_test_dbm2_121_71', master_port= 3317, master_log_file='', master_log_pos= 4, master_bind=''.
2017-01-10T09:18:39.485250Z 144 [Note] Plugin group_replication reported: 'Establishing 
connection to a group replication recovery donor 3d872c2e-d670-11e6-ac1f-b8ca3af6e36c at hch_test_dbm2_121_71 port: 3317.'
2017-01-10T09:18:39.489356Z 150 [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.
2017-01-10T09:18:39.493511Z 150 [ERROR] Slave I/O for channel 'group_replication_recovery': 
error connecting to master 'repl@hch_test_dbm2_121_71:3317' - retry-time: 60  retries: 1, Error_code: 2005
2017-01-10T09:18:39.493912Z 150 [Note] Slave I/O thread for channel 'group_replication_recovery' killed while connecting to master
2017-01-10T09:18:39.494069Z 150 [Note] Slave I/O thread exiting for channel 'group_replication_recovery', read up to log 'FIRST', position 4
2017-01-10T09:18:39.495155Z 144 [ERROR] Plugin group_replication reported: 
'There was an error when connecting to the donor server. Check group replication recovery's connection credentials.'
2017-01-10T09:18:39.496838Z 144 [Note] Plugin group_replication reported: 'Retrying group recovery connection with another donor. Attempt 3/10'

【解决办法】：

看报错[ERROR] Slave I/O for channel'group_replication_recovery': error connecting to master 'repl@hch_test_dbm2_121_71:3317'- retry-time: 60  retries: 1, Error_code:2005，连接master库不上，所以问题在这里，我们赋予的复制账号是ip的repl@'192.168.%'，所以还需要做一个hostname(hch_test_dbm2_121_71)和db1的ip地址192.168.121.71的映射关系。

 

建立hostname和ip映射

vim /etc/hosts
192.168.121.71 db1 hch_test_dbm2_121_71                                          
192.168.121.111 db2 bpe_service
192.168.121.24 db3 hch_test_web_1_24

然后在db2上执行如下命令后重新开启group_replication即可。

mysql> stop group_replication;
Query OK, 0 rows affected (0.02 sec)                                                 
 
mysql> start group_replication;
Query OK, 0 rows affected (5.68 sec)
 
mysql>

再去master库db1上，查看group_replication成员，会有db2的显示

mysql>  SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| CHANNEL_NAME   | MEMBER_ID     | MEMBER_HOST          | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| group_replication_applier | 3d872c2e-d670-11e6-ac1f-b8ca3af6e36c | hch_test_dbm2_121_71 |        3317 | ONLINE       |
| group_replication_applier | fdf2b02e-d66f-11e6-98a8-18a99b76310d | bpe_service          |        3317 | ONLINE       |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
2 rows in set (0.00 sec)
 
mysql>

8.3问题记录三

操作问题

mysql>
mysql> START GROUP_REPLICATION;
ERROR 3092 (HY000): The server is notconfigured properly to be an active member of the group. Please see moredetails on error log.

 

【解决办法】：

mysql> SET GLOBALgroup_replication_bootstrap_group = ON;
Query OK, 0 rows affected (0.00 sec)
 
mysql> START GROUP_REPLICATION;
Query OK, 0 rows affected (1.03 sec)
 
mysql>

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