The Ultimate Guide to High Availability with MariaDB
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MySQL 5.0 to MariaDB 10.2.8 - Unknown system variable 'binlog_checksum', Internal MariaDB error code: 1193

We are finally upgrading our MySQL 5.0.90 environment to MariaDB, and we would like to enable replication from MySQL 5.0 to MariaDB 10.2.8 and then cutover thus providing minimal downtime. I tried this originally with MariaDB 10.1.18 and it worked fine. MariaDB 10.2.8 became GA so we moved our upgrade process to that version. Now when I try to begin replication I get the following error in the MariaDB mysqld.err log:

```Unknown system variable 'binlog_checksum', Internal MariaDB error code: 1193```

When I execute 'show slave status' I see the following:

Slave_IO_Running: No Slave_SQL_Running: Yes

Last_IO_Errno: 1595 Last_IO_Error: Relay log write failure: could not queue event from master

Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

I've tried to do some research on this but have been unable to resolve the problem.

Here is the entire section of the log where replication is starting.

2017-11-20 8:26:43 140154253575936 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.002735' at position 98, relay log './mysqld-relay-bin.000001' position: 4 2017-11-20 8:26:43 140154252973824 [Note] Slave I/O thread: connected to master 'repl@scvm50.dev.ut1.omniture.com:3306',replication started in log 'mysql-bin.002735' at position 98 2017-11-20 8:26:43 140154252973824 [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 2017-11-20 8:26:43 140154252973824 [ERROR] Slave I/O: Replication event checksum verification failed while reading from network, Internal MariaDB error code: 1743 2017-11-20 8:26:43 140154252973824 [ERROR] Slave I/O: Relay log write failure: could not queue event from master, Internal MariaDB error code: 1595 2017-11-20 8:26:43 140154252973824 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.002735', position 98

Answer Answered by Ian Gilfillan in this comment.

See Upgrading from MariaDB 10.1 to MariaDB 10.2 which describes a solution for binlog_checksum. When upgrading so many major versions at once, it's important to check the changes for each major release to look for any issues that can cause problems.

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