HI,

Today, we upgrade a group MariaDB 10.1.22 to MariaDB 10.2.6, after upgade, start delay slave : change master to master_delay=86400

start slave and execute show all slaves status , Seconds_Behind_Master continue grow and Exec_Master_Log_Pos not change,

please help confirm what cause lead this ? thanks.

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

Exec_Master_Log_Pos: 367

Seconds_Behind_Master: 116072

Gtid_IO_Pos: 0-227-72846307321

Parallel_Mode: conservative

SQL_Delay: 86400

SQL_Remaining_Delay: 83164

Slave_SQL_Running_State: Waiting until MASTER_DELAY seconds after master executed event

after 5 minutes,

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

Exec_Master_Log_Pos: 367

Seconds_Behind_Master: 116550

Gtid_IO_Pos: 0-227-72846546131

Parallel_Mode: conservative

SQL_Delay: 86400

SQL_Remaining_Delay: 82686

Slave_SQL_Running_State: Waiting until MASTER_DELAY seconds after master executed event