mariadb : Relay log write failure
10,685
I had the same issue and found an answer. The variable slave_sql_verify_checksum
as to be set in the configuration file my.cnf
. Set slave_sql_verify_checksum = NONE
and restart the server.
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Author by
Mustermann
Updated on June 04, 2022Comments
-
Mustermann almost 2 years
I am currently trying to get a MariaDB 10.2.9 to run as a slave of a mysql 5.5 master but i keep getting the same error (Last_IO_Errno: 1595, Relay log write failure: could not queue event from master)
As there is some difference in version between master and slave i had to set
set global binlog_checksum='NONE';
All in all i took a mysqldump of the master, read the log_pos/file and
SET GLOBAL server_id=2; CHANGE MASTER TO MASTER_HOST='10.145.46.11',MASTER_USER='replicant',MASTER_PASSWORD='...', MASTER_LOG_FILE='mysql-bin.000042', MASTER_LOG_POS=107; start slave;
But the IO Thread simply wont start, the mariadb.log says:
... 2017-10-31 11:44:41 140026338711296 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.000007' at position 107, relay log './mariadb-relay-bin.000001' position: 4 2017-10-31 11:44:41 140027007977216 [Note] Slave I/O thread: connected to master '[email protected]:3306',replication started in log 'mysql-bin.000007' at position 107 2017-10-31 11:44:42 140027007977216 [Warning] Slave I/O: Notifying master by SET @master_binlog_checksum= @@global.binlog_checksum failed with error: Unknown system variable 'binlog_checksum', Internal MariaDB error code: 1193 2017-10-31 11:44:42 140027007977216 [ERROR] Slave I/O: Replication event checksum verification failed while reading from network, Internal MariaDB error code: 1743 2017-10-31 11:44:42 140027007977216 [ERROR] Slave I/O: Relay log write failure: could not queue event from master, Internal MariaDB error code: 1595 2017-10-31 11:44:42 140027007977216 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000007', position 107 ....
I am also not sure what kind of checksum is failing here (mysql reference says "replication event checksum"?), ive tried:
set global slave_sql_verify_checksum=0;
current status is:
MariaDB [(none)]> show slave status \G; *************************** 1. row *************************** Slave_IO_State: Master_Host: 10.145.46.11 Master_User: replicant Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000007 Read_Master_Log_Pos: 107 Relay_Log_File: mariadb-relay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: mysql-bin.000007 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: 107 Relay_Log_Space: 256 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: 1595 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: 1 Master_SSL_Crl: Master_SSL_Crlpath: Using_Gtid: No Gtid_IO_Pos: Replicate_Do_Domain_Ids: Replicate_Ignore_Domain_Ids: Parallel_Mode: conservative SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it