MySQL MGR 搭建过程常见问题

故障1

[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'

根据提示打开set global group_replication_allow_local_disjoint_gtids_join=ON;

故障二

[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'

解决方案：

该故障和故障1的不同之处在于该问题出现时，参数group_replication_allow_local_disjoint_gtids_join已经设置成为on了。解决该问题的方法是执行reset master就行，然后重新在主节点和从节点开启通道，即

CHANGE MASTER TO MASTER_USER='rpl_user', MASTER_PASSWORD='rpl_pass' FOR CHANNEL 'group_replication_recovery';

故障3

[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 /'

这个问题是由于测试环境上三台主机的hostname设置成为了同一个名称，改了hostname之后，这个问题就解决了。

故障四

#在线上正式环境操作时，出现下面的错误，
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，发现只有一个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.

set global slave_preserve_commit_order=on

故障5

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.

在my.cnf中配置group_replication_ip_whitelist参数即可解决

故障6

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 ''

这个错误是由于slave节点由于某种原因导致找不到relay-log的位置了，需要重新reset slave

故障7

This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *mi
​
ght* want to use the less safe log_bin_trust_function_creators variable) Error_code: 1418