[ERROR] Plugin group_replication reported: 'This member has more executed transactions than those present in the group. Local transactions: bb874065-c485-11e8-8b52-000c2934472e:1 > Group transactions: 3db33b36-0e51-409f-a61d-c99756e90155:1-11'
[ERROR] Plugin group_replication reported: 'The member contains transactions not present in the group. The member will now exit the group.'
[Note] Plugin group_replication reported: ‘To force this member into the group you can use the group_replication_allow_local_disjoint_gtids_join option'

[ERROR] Plugin group_replication reported: 'This member has more executed transactions than those present in the group. Local transactions: bb874065-c485-11e8-8b52-000c2934472e:1 > Group transactions: 3db33b36-0e51-409f-a61d-c99756e90155:1-15'
[Warning] Plugin group_replication reported: 'The member contains transactions not present in the group. It is only allowed to join due to group_replication_allow_local_disjoint_gtids_join option'
[Note] Plugin group_replication reported: 'This server is working as secondary member with primary member address localhost.localdomaion:3306.'

[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.
 [ERROR] Slave I/O for channel 'group_replication_recovery': error connecting to master 'rpl_user@localhost.localdomaion:' - retry-time: 60 retries: 1, Error_code: 2005
 [ERROR] Plugin group_replication reported: 'There was an error when connecting to the donor server. Please check that group_replication_recovery channel credentials and all MEMBER_HOST column values of performance_schema.replication_group_members table are correct and DNS resolvable.'
 [ERROR] Plugin group_replication reported: 'For details please check performance_schema.replication_connection_status table and error log messages of Slave I/O for channel group_replication_recovery.'
 [Note] Plugin group_replication reported: 'Retrying group recovery connection with another donor. Attempt /'

#在線上正式環境操作時，出現下面的錯誤，
mysql--root@localhost:(none) ::>>START GROUP_REPLICATION;
ERROR (HY000): The server is not configured properly to be an active member of the group. Please see more details on error log.
#查看log文件，發現只有一個warning：
2019-02-20T07::30.233937Z [Warning] Plugin group_replication reported: 'Group Replication requires slave-preserve-commit-order to be set to ON when using more than 1 applier threads.

mysql--root@localhost:(none) ::>>show variables like "%preserve%";
+--------------------------------+---------+
| Variable_name    | Value |
+--------------------------------+---------+
| slave_preserve_commit_order | OFF |
+--------------------------------+---------+
 row in set (0.01 sec)
mysql--root@localhost:(none) ::>>set global slave_preserve_commit_order=;
Query OK, rows affected (0.00 sec)

2019-02-20T08::31.088437Z [Warning] Plugin group_replication reported: '[GCS] Connection attempt from IP address 192.168.9.208 refused. 
Address is not in the IP whitelist.'
2019-02-20T08::32.088676Z [Warning] Plugin group_replication reported: '[GCS] Connection attempt from IP address 192.168.9.208 refused.
 Address is not in the IP whitelist.'

2019-02-20T08::44.087492Z [Warning] Plugin group_replication reported: 'read failed'
2019-02-20T08::44.096171Z [ERROR] Plugin group_replication reported: '[GCS] The member was unable to join the group. Local port: 24801'
2019-02-20T08::14.065775Z [ERROR] Plugin group_replication reported: 'Timeout on wait for view after joining group

 [ERROR] Plugin group_replication reported: ‘[GCS] Error on opening a connection to oceanbase07: on local port: '.'
 [ERROR] Plugin group_replication reported: ‘[GCS] Error on opening a connection to oceanbase08: on local port: '.'
 [ERROR] Plugin group_replication reported: ‘[GCS] Error on opening a connection to oceanbase07: on local port: '.'

[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.
 [ERROR] Slave I/O for channel 'group_replication_recovery': Master command COM_REGISTER_SLAVE failed: Access denied for user 'rpl_user'@'%' (using password: YES) (Errno: 1045), Error_code: 1597
 [ERROR] Slave I/O thread couldn't register on master
 [Note] Slave I/O thread exiting for channel 'group_replication_recovery', read up to log 'FIRST', position 

 [ERROR] Failed to open the relay log './localhost-relay-bin.000011' (relay_log_pos ).
 [ERROR] Could not find target log file mentioned in relay log info in the index file './work_NAT_1-relay-bin. index' during relay log initialization.
 [ERROR] Slave: Failed to initialize the master info structure for channel ''; its record may still be present in 'mysql.slave_master_info' table, consider deleting it.
 [ERROR] Failed to open the relay log './localhost-relay-bin-group_replication_recovery.000001' (relay_log_pos  ).
 [ERROR] Could not find target log file mentioned in relay log info in the index file './work_NAT_1-relay-bin-group_replication_recovery.index' during relay log initialization.
 [ERROR] Slave: Failed to initialize the master info structure for channel 'group_replication_recovery'; its record may still be present in 'mysql.slave_master_info' table, consider deleting it.
 [ERROR] Failed to create or recover replication info repositories.
 [ERROR] Slave SQL for channel '': Slave failed to initialize relay log info structure from the repository, Error_code: 
 [ERROR] /usr/local/mysql/bin/mysqld: Slave failed to initialize relay log info structure from the repository
 [ERROR] Failed to start slave threads for channel ''