Description:
Multi-Source Replication close a channel causes the io thread of another replication channel to close.
I set up a multi-source replication: A->C<-B ,using gtid and semi-replication.
Here c has two replication channels:
Channel_Name: c3444 （master is A）
Channel_Name: c3445 （master is B）
When I try to close channel 'c3444',error log output on B:
2021-03-16T07:07:27.835149Z 15 [ERROR] [MY-013115] [Repl] Slave I/O for channel 'c3445': Replication event checksum verification failed while reading from network. Error_code: MY-013115
2021-03-16T07:07:27.835508Z 15 [ERROR] [MY-013122] [Repl] Slave I/O for channel 'c3445': Relay log write failure: could not queue event from master, Error_code: MY-013122
How to repeat:
Here are three instances:A、B and C.
GTID and semi-synchronous replication are enabled on each instance.
A:
mysql> show variables like '%semi%';
+-------------------------------------------+------------+
| Variable_name | Value |
+-------------------------------------------+------------+
| rpl_semi_sync_master_enabled | ON |
| rpl_semi_sync_master_timeout | 3000 |
| rpl_semi_sync_master_trace_level | 32 |
| rpl_semi_sync_master_wait_for_slave_count | 1 |
| rpl_semi_sync_master_wait_no_slave | ON |
| rpl_semi_sync_master_wait_point | AFTER_SYNC |
| rpl_semi_sync_slave_enabled | ON |
| rpl_semi_sync_slave_trace_level | 32 |
+-------------------------------------------+------------+
B:
mysql> show variables like '%semi%';
+-------------------------------------------+------------+
| Variable_name | Value |
+-------------------------------------------+------------+
| rpl_semi_sync_master_enabled | ON |
| rpl_semi_sync_master_timeout | 3000 |
| rpl_semi_sync_master_trace_level | 32 |
| rpl_semi_sync_master_wait_for_slave_count | 1 |
| rpl_semi_sync_master_wait_no_slave | ON |
| rpl_semi_sync_master_wait_point | AFTER_SYNC |
| rpl_semi_sync_slave_enabled | ON |
| rpl_semi_sync_slave_trace_level | 32 |
+-------------------------------------------+------------+
C:
mysql> show variables like '%semi%';
+-------------------------------------------+------------+
| Variable_name | Value |
+-------------------------------------------+------------+
| rpl_semi_sync_master_enabled | ON |
| rpl_semi_sync_master_timeout | 3000 |
| rpl_semi_sync_master_trace_level | 32 |
| rpl_semi_sync_master_wait_for_slave_count | 1 |
| rpl_semi_sync_master_wait_no_slave | ON |
| rpl_semi_sync_master_wait_point | AFTER_SYNC |
| rpl_semi_sync_slave_enabled | ON |
| rpl_semi_sync_slave_trace_level | 32 |
+-------------------------------------------+------------+
The final database architecture is A->C<-B
View the master-slave status on the C instance:
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.221.222.186
Master_User: repl
Master_Port: 3444
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 873
Relay_Log_File: relay-log-c3444.000014
Relay_Log_Pos: 456
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 873
Relay_Log_Space: 965
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 102213444
Master_UUID: b1fc0fef-8600-11eb-b902-fa37ddbb3200
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: b1fc0fef-8600-11eb-b902-fa37ddbb3200:2-3
Executed_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:1-3,
b1fc0fef-8600-11eb-b902-fa37ddbb3200:1-3
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: c3444
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
*************************** 2. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.221.222.186
Master_User: repl
Master_Port: 3445
Connect_Retry: 60
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 873
Relay_Log_File: relay-log-c3445.000014
Relay_Log_Pos: 456
Relay_Master_Log_File: mysql-bin.000005
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 873
Relay_Log_Space: 965
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 102213445
Master_UUID: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:2-3
Executed_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:1-3,
b1fc0fef-8600-11eb-b902-fa37ddbb3200:1-3
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: c3445
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
2 rows in set (0.00 sec)
Only the c3444 channel is stopped at this time:
mysql> stop slave for channel 'c3444';
Query OK, 0 rows affected (0.03 sec)
Check the master-slave status again:
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.221.222.186
Master_User: repl
Master_Port: 3444
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 873
Relay_Log_File: relay-log-c3444.000014
Relay_Log_Pos: 456
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: No
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 873
Relay_Log_Space: 965
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 102213444
Master_UUID: b1fc0fef-8600-11eb-b902-fa37ddbb3200
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: b1fc0fef-8600-11eb-b902-fa37ddbb3200:2-3
Executed_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:1-3,
b1fc0fef-8600-11eb-b902-fa37ddbb3200:1-3
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: c3444
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
*************************** 2. row ***************************
Slave_IO_State:
Master_Host: 192.221.222.186
Master_User: repl
Master_Port: 3445
Connect_Retry: 60
Master_Log_File: mysql-bin.000005
Read_Master_Log_Pos: 873
Relay_Log_File: relay-log-c3445.000014
Relay_Log_Pos: 456
Relay_Master_Log_File: mysql-bin.000005
Slave_IO_Running: No
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 873
Relay_Log_Space: 965
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 13122
Last_IO_Error: Relay log write failure: could not queue event from master
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 102213445
Master_UUID: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp: 210316 15:17:03
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:2-3
Executed_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:1-3,
b1fc0fef-8600-11eb-b902-fa37ddbb3200:1-3
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: c3445
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
2 rows in set (0.00 sec)
View the error log:
2021-03-16T07:17:03.760665Z 27 [ERROR] [MY-013115] [Repl] Slave I/O for channel 'c3445': Replication event checksum verification failed while reading from network. Error_code: MY-013115
2021-03-16T07:17:03.760926Z 27 [ERROR] [MY-013122] [Repl] Slave I/O for channel 'c3445': Relay log write failure: could not queue event from master, Error_code: MY-013122
At this point, you need to execute: start slave; to make other channel normal as well
This will not be a problem if the semi-synchronous replication of the multi-source replication slave is closed.
Description: Multi-Source Replication close a channel causes the io thread of another replication channel to close. I set up a multi-source replication: A->C<-B ,using gtid and semi-replication. Here c has two replication channels: Channel_Name: c3444 （master is A） Channel_Name: c3445 （master is B） When I try to close channel 'c3444',error log output on B: 2021-03-16T07:07:27.835149Z 15 [ERROR] [MY-013115] [Repl] Slave I/O for channel 'c3445': Replication event checksum verification failed while reading from network. Error_code: MY-013115 2021-03-16T07:07:27.835508Z 15 [ERROR] [MY-013122] [Repl] Slave I/O for channel 'c3445': Relay log write failure: could not queue event from master, Error_code: MY-013122 How to repeat: Here are three instances:A、B and C. GTID and semi-synchronous replication are enabled on each instance. A: mysql> show variables like '%semi%'; +-------------------------------------------+------------+ | Variable_name | Value | +-------------------------------------------+------------+ | rpl_semi_sync_master_enabled | ON | | rpl_semi_sync_master_timeout | 3000 | | rpl_semi_sync_master_trace_level | 32 | | rpl_semi_sync_master_wait_for_slave_count | 1 | | rpl_semi_sync_master_wait_no_slave | ON | | rpl_semi_sync_master_wait_point | AFTER_SYNC | | rpl_semi_sync_slave_enabled | ON | | rpl_semi_sync_slave_trace_level | 32 | +-------------------------------------------+------------+ B: mysql> show variables like '%semi%'; +-------------------------------------------+------------+ | Variable_name | Value | +-------------------------------------------+------------+ | rpl_semi_sync_master_enabled | ON | | rpl_semi_sync_master_timeout | 3000 | | rpl_semi_sync_master_trace_level | 32 | | rpl_semi_sync_master_wait_for_slave_count | 1 | | rpl_semi_sync_master_wait_no_slave | ON | | rpl_semi_sync_master_wait_point | AFTER_SYNC | | rpl_semi_sync_slave_enabled | ON | | rpl_semi_sync_slave_trace_level | 32 | +-------------------------------------------+------------+ C: mysql> show variables like '%semi%'; +-------------------------------------------+------------+ | Variable_name | Value | +-------------------------------------------+------------+ | rpl_semi_sync_master_enabled | ON | | rpl_semi_sync_master_timeout | 3000 | | rpl_semi_sync_master_trace_level | 32 | | rpl_semi_sync_master_wait_for_slave_count | 1 | | rpl_semi_sync_master_wait_no_slave | ON | | rpl_semi_sync_master_wait_point | AFTER_SYNC | | rpl_semi_sync_slave_enabled | ON | | rpl_semi_sync_slave_trace_level | 32 | +-------------------------------------------+------------+ The final database architecture is A->C<-B View the master-slave status on the C instance: mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.221.222.186 Master_User: repl Master_Port: 3444 Connect_Retry: 60 Master_Log_File: mysql-bin.000003 Read_Master_Log_Pos: 873 Relay_Log_File: relay-log-c3444.000014 Relay_Log_Pos: 456 Relay_Master_Log_File: mysql-bin.000003 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 873 Relay_Log_Space: 965 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 102213444 Master_UUID: b1fc0fef-8600-11eb-b902-fa37ddbb3200 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: b1fc0fef-8600-11eb-b902-fa37ddbb3200:2-3 Executed_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:1-3, b1fc0fef-8600-11eb-b902-fa37ddbb3200:1-3 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: c3444 Master_TLS_Version: Master_public_key_path: Get_master_public_key: 0 Network_Namespace: *************************** 2. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.221.222.186 Master_User: repl Master_Port: 3445 Connect_Retry: 60 Master_Log_File: mysql-bin.000005 Read_Master_Log_Pos: 873 Relay_Log_File: relay-log-c3445.000014 Relay_Log_Pos: 456 Relay_Master_Log_File: mysql-bin.000005 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 873 Relay_Log_Space: 965 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 102213445 Master_UUID: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:2-3 Executed_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:1-3, b1fc0fef-8600-11eb-b902-fa37ddbb3200:1-3 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: c3445 Master_TLS_Version: Master_public_key_path: Get_master_public_key: 0 Network_Namespace: 2 rows in set (0.00 sec) Only the c3444 channel is stopped at this time: mysql> stop slave for channel 'c3444'; Query OK, 0 rows affected (0.03 sec) Check the master-slave status again: mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Master_Host: 192.221.222.186 Master_User: repl Master_Port: 3444 Connect_Retry: 60 Master_Log_File: mysql-bin.000003 Read_Master_Log_Pos: 873 Relay_Log_File: relay-log-c3444.000014 Relay_Log_Pos: 456 Relay_Master_Log_File: mysql-bin.000003 Slave_IO_Running: No Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 873 Relay_Log_Space: 965 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 102213444 Master_UUID: b1fc0fef-8600-11eb-b902-fa37ddbb3200 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: b1fc0fef-8600-11eb-b902-fa37ddbb3200:2-3 Executed_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:1-3, b1fc0fef-8600-11eb-b902-fa37ddbb3200:1-3 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: c3444 Master_TLS_Version: Master_public_key_path: Get_master_public_key: 0 Network_Namespace: *************************** 2. row *************************** Slave_IO_State: Master_Host: 192.221.222.186 Master_User: repl Master_Port: 3445 Connect_Retry: 60 Master_Log_File: mysql-bin.000005 Read_Master_Log_Pos: 873 Relay_Log_File: relay-log-c3445.000014 Relay_Log_Pos: 456 Relay_Master_Log_File: mysql-bin.000005 Slave_IO_Running: No Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 873 Relay_Log_Space: 965 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 13122 Last_IO_Error: Relay log write failure: could not queue event from master Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 102213445 Master_UUID: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: 210316 15:17:03 Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:2-3 Executed_Gtid_Set: 7225ff3b-85fd-11eb-bcbc-fa37ddbb3200:1-3, b1fc0fef-8600-11eb-b902-fa37ddbb3200:1-3 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: c3445 Master_TLS_Version: Master_public_key_path: Get_master_public_key: 0 Network_Namespace: 2 rows in set (0.00 sec) View the error log: 2021-03-16T07:17:03.760665Z 27 [ERROR] [MY-013115] [Repl] Slave I/O for channel 'c3445': Replication event checksum verification failed while reading from network. Error_code: MY-013115 2021-03-16T07:17:03.760926Z 27 [ERROR] [MY-013122] [Repl] Slave I/O for channel 'c3445': Relay log write failure: could not queue event from master, Error_code: MY-013122 At this point, you need to execute: start slave; to make other channel normal as well This will not be a problem if the semi-synchronous replication of the multi-source replication slave is closed.