概述
1，关于MySQL Group Replication
基于组的复制（Group-basedReplication）是一种被使用在容错系统中的技术。Replication-group（复制组）是由能够相互通信的多个服务器（节点）组成的。
在通信层，Groupreplication实现了一系列的机制：比如原子消息（atomicmessage delivery）和全序化消息（totalorderingof messages）。
这些原子化，抽象化的机制，为实现更先进的数据库复制方案提供了强有力的支持。
MySQL Group Replication正是基于这些技术和概念，实现了一种多主全更新的复制协议。
简而言之，一个Replication-group就是一组节点，每个节点都可以独立执行事务，而读写事务则会在于group内的其他节点进行协调之后再commit。
因此，当一个事务准备提交时，会自动在group内进行原子性的广播，告知其他节点变更了什么内容/执行了什么事务。
这种原子广播的方式，使得这个事务在每一个节点上都保持着同样顺序。
这意味着每一个节点都以同样的顺序，接收到了同样的事务日志，所以每一个节点以同样的顺序重演了这些事务日志，最终整个group保持了完全一致的状态。
然而，不同的节点上执行的事务之间有可能存在资源争用。这种现象容易出现在两个不同的并发事务上。
假设在不同的节点上有两个并发事务，更新了同一行数据，那么就会发生资源争用。
面对这种情况，GroupReplication判定先提交的事务为有效事务，会在整个group里面重演，后提交的事务会直接中断，或者回滚，最后丢弃掉。
因此，这也是一个无共享的复制方案，每一个节点都保存了完整的数据副本。看如下图片01.png，描述了具体的工作流程，能够简洁的和其他方案进行对比。这个复制方案，在某种程度上，和数据库状态机（DBSM）的Replication方法比较类似。
2，安装mysql5.7.17
官方下载地址：http://dev.mysql.com/downloads/mysql/，不过官方只保留最新的version，5.7.17这个url地址不一定长期有效，所以，需要的不一定有，我这里在百度云盘保留了下来，版本是5.7.17，可以随时去下载使用，分享地址：链接：http://pan.baidu.com/s/1jIhqSXw密码：ifx5
安装过程参考我的blog地址：http://blog.csdn.net/mchdba/article/details/53889781，大概变化的地方就是my.cnf里面的server-id需要修改。
在三台db服务器上面设置/etc/hosts映射，如下：
| 192.168.121.71 db1 192.168.121.111 db2 192.168.121.24 db3 |
安装的数据库服务器：
| 数据库服务器地址 | 端口 | 数据目录 | Server-id |
| 192.168.121.71（db1） | 3317 | /data/mysql/data | 12001 |
| 192.168.121.111（db2） | 3317 | /data/mysql/data | 12002 |
| 192.168.121.24（db3） | 3317 | /data/mysql/data | 12003 |
blog源地址为：http://blog.csdn.net/mchdba/article/details/54318316，作者mchdba（黄杉），谢绝转载
3，创建复制环境
设置hostname和ip映射
在db1、db2、db3上都设置
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
在db1/db2/db3上建立复制账号：
| GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.%' IDENTIFIED BY 'rlpbright_1927@ys'; |
4，安装group replication插件
在db1、db2、db3上依次安装group replication插件
mysql> INSTALL PLUGIN group_replication SONAME 'group_replication.so';
Query OK, 0 rows affected (0.01 sec)
mysql>
plugin-load=group_replication或者直接在配置文件my.cnf中配置：
查看group replication组件
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>
5，配置group replication参数
确保binlog_format是row格式。
mysql> show variables like 'binlog_format';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| binlog_format | ROW |
+---------------+-------+
1 row in set (0.00 sec)
mysql>
两种配置方式，在线添加 OR 配置文件
5.1在线添加
配置：
| (1) 配置命令如下，具体到某一个db节点会有所调整，大部分参数是一致的： 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) 在db1执行过程如下： 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) 在db2执行过程如下： 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) 在db3执行过程如下：
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>
最后
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