set @save_binlog_checksum= @@global.binlog_checksum;
set @@global.binlog_checksum = default;
select @@global.binlog_checksum as 'must be CRC32 by default';
must be CRC32 by default
CRC32
select @@session.binlog_checksum as 'no session var';
ERROR HY000: Variable 'binlog_checksum' is a GLOBAL variable
set @@global.binlog_checksum = CRC32;
set @@global.binlog_checksum = CRC32;
set @@global.master_verify_checksum = 0;
set @@global.master_verify_checksum = default;
set @@global.binlog_checksum = ADLER32;
ERROR 42000: Variable 'binlog_checksum' can't be set to the value of 'ADLER32'
set @@global.binlog_checksum = @save_binlog_checksum;