Details
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Bug
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Status: Confirmed (View Workflow)
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Major
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Resolution: Unresolved
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5.3.12, 5.5, 10.0, 10.1
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None
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Linux
Description
Manual (https://mariadb.com/kb/en/mariadb/binlog-event-checksums/) says that binlog_checksum can be changed dynamically and:
"When checksums are enabled, replication slaves will check events received over the network for checksum errors, and will stop with an error if a corrupt event is detected."
It does NOT say what should happen when binlog_checksum is disabled dynamically.
In case of a MariaDB 10.0.20 slave (started with log_slave_updates and binlog_checksum=CRC32 in my.cnf) that we want to make replicating from MySQL 5.5 master (that does not support binlog_checksum) while it also replicates from MariaDB 10.0.20 master we have a problem upon I/O thread start:
150720 17:12:15 [Note] 'CHANGE MASTER TO executed'. Previous state master_host='127.0.0.1', master_port='3306', master_log_file='', master_log_pos='4'. New state master_host='127.0.0.1', master_port='3306', master_log_file='ao756-bin.000001', master_log_pos='107'.
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150720 17:12:23 [Note] Master 'mysql55': Slave SQL thread initialized, starting replication in log 'ao756-bin.000001' at position 107, relay log './mysql_sandbox25031-relay-bin-mysql55.000001' position: 4
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150720 17:12:23 [Note] Master 'mysql55': Slave I/O thread: connected to master 'root@127.0.0.1:3306',replication started in log 'ao756-bin.000001' at position 107
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150720 17:12:23 [ERROR] Master 'mysql55': Slave I/O: Replication event checksum verification failed while reading from network. Internal MariaDB error code: 1743
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150720 17:12:23 [ERROR] Master 'mysql55': Slave I/O: Relay log write failure: could not queue event from master, Internal MariaDB error code: 1595
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150720 17:12:23 [Note] Master 'mysql55': Slave I/O thread exiting, read up to log 'ao756-bin.000001', position 107
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and this problem can NOT be resolved by changing binlog_checksum to NONE dynamically on slave. One has to comment setting out in my.cnf and restart the entire instance:
slave1 [localhost] {msandbox} ((none)) > show global variables like 'binlog_che%';
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+-----------------+-------+
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| Variable_name | Value |
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+-----------------+-------+
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| binlog_checksum | NONE |
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+-----------------+-------+
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1 row in set (0.00 sec)
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slave1 [localhost] {msandbox} ((none)) > set global slave_sql_verify_checksum=OFF;
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Query OK, 0 rows affected (0.00 sec)
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slave1 [localhost] {msandbox} ((none)) > show variables like 'slave_sql%'; +---------------------------+-------+
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| Variable_name | Value |
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+---------------------------+-------+
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| slave_sql_verify_checksum | OFF |
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+---------------------------+-------+
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1 row in set (0.00 sec)
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slave1 [localhost] {msandbox} ((none)) > stop slave 'mysql55'; Query OK, 0 rows affected (0.02 sec)
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slave1 [localhost] {msandbox} ((none)) > reset slave 'mysql55'; Query OK, 0 rows affected (0.00 sec)
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slave1 [localhost] {msandbox} ((none)) > change master 'mysql55' to master_host='127.0.0.1', master_user='root', master_port=3306, master_log_file='ao756-bin.000001', master_log_pos=107;
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Query OK, 0 rows affected (0.31 sec)
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slave1 [localhost] {msandbox} ((none)) > start slave 'mysql55'; Query OK, 0 rows affected (0.00 sec)
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slave1 [localhost] {msandbox} ((none)) > show slave 'mysql55' status\G *************************** 1. row ***************************
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Slave_IO_State:
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Master_Host: 127.0.0.1
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Master_User: root
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Master_Port: 3306
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Connect_Retry: 60
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Master_Log_File: ao756-bin.000001
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Read_Master_Log_Pos: 107
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Relay_Log_File: mysql_sandbox25031-relay-bin-mysql55.000001
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Relay_Log_Pos: 4
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Relay_Master_Log_File: ao756-bin.000001
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Slave_IO_Running: No
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Slave_SQL_Running: Yes
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Replicate_Do_DB:
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Replicate_Ignore_DB:
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Replicate_Do_Table:
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Replicate_Ignore_Table:
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Replicate_Wild_Do_Table:
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Replicate_Wild_Ignore_Table:
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Last_Errno: 0
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Last_Error:
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Skip_Counter: 0
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Exec_Master_Log_Pos: 107
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Relay_Log_Space: 248
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Until_Condition: None
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Until_Log_File:
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Until_Log_Pos: 0
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Master_SSL_Allowed: No
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Master_SSL_CA_File:
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Master_SSL_CA_Path:
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Master_SSL_Cert:
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Master_SSL_Cipher:
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Master_SSL_Key:
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Seconds_Behind_Master: NULL
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Master_SSL_Verify_Server_Cert: No
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Last_IO_Errno: 1595
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Last_IO_Error: Relay log write failure: could not queue event from master
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Last_SQL_Errno: 0
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Last_SQL_Error:
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Replicate_Ignore_Server_Ids:
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Master_Server_Id: 1111
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Master_SSL_Crl:
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Master_SSL_Crlpath:
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Using_Gtid: No
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Gtid_IO_Pos:
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1 row in set (0.00 sec)
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openxs@ao756:~/sandboxes/rsandbox_mariadb-10_0_20/node1$ ./stop
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openxs@ao756:~/sandboxes/rsandbox_mariadb-10_0_20/node1$ vi my.sandbox.cnf openxs@ao756:~/sandboxes/rsandbox_mariadb-10_0_20/node1$ ./start
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. sandbox server started
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openxs@ao756:~/sandboxes/rsandbox_mariadb-10_0_20/node1$ ./my sql Welcome to the MariaDB monitor. Commands end with ; or \g.
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Your MariaDB connection id is 7
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Server version: 10.0.20-MariaDB-log MariaDB Server
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Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
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slave1 [localhost] {msandbox} ((none)) > show slave 'mysql55' status\G
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*************************** 1. row ***************************
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Slave_IO_State: Waiting for master to send event
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Master_Host: 127.0.0.1
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Master_User: root
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Master_Port: 3306
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Connect_Retry: 60
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Master_Log_File: ao756-bin.000002
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Read_Master_Log_Pos: 576
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Relay_Log_File: mysql_sandbox25031-relay-bin-mysql55.000004
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Relay_Log_Pos: 863
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Relay_Master_Log_File: ao756-bin.000002
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Slave_IO_Running: Yes
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Slave_SQL_Running: Yes
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Replicate_Do_DB:
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Replicate_Ignore_DB:
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Replicate_Do_Table:
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Replicate_Ignore_Table:
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Replicate_Wild_Do_Table:
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Replicate_Wild_Ignore_Table:
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Last_Errno: 0
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Last_Error:
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Skip_Counter: 0
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Exec_Master_Log_Pos: 576
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Relay_Log_Space: 1327
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Until_Condition: None
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Until_Log_File:
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Until_Log_Pos: 0
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Master_SSL_Allowed: No
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Master_SSL_CA_File:
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Master_SSL_CA_Path:
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Master_SSL_Cert:
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Master_SSL_Cipher:
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Master_SSL_Key:
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Seconds_Behind_Master: 0
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Master_SSL_Verify_Server_Cert: No
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Last_IO_Errno: 0
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Last_IO_Error:
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Last_SQL_Errno: 0
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Last_SQL_Error:
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Replicate_Ignore_Server_Ids:
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Master_Server_Id: 1111
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Master_SSL_Crl:
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Master_SSL_Crlpath:
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Using_Gtid: No
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Gtid_IO_Pos:
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1 row in set (0.00 sec)
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This is unexpected after reading the manual and is a problem in general (as any instance restart).
So, please, either document this case properly or, even better, make sure that slave is not checking checksums in I/O thread after binlog_checksum is reset to NONE globally (so that next START SLAVE works).
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