Fixing MySQL replication after slaves’s relay log was corrupted
MySQL replication on slave (version 5.1.61) has stopped. Slave_IO_Running was marked as Yes, but Slave_SQL_Running as No. Simple stop/start slave didn’t help so further problem analysis was needed. It seemed that current slave’s relay log was corrupted because testing with “mysqlbinlog” has printed out an error. Therefore, the solution was to discard current relay binlogs and to point slave to the last master binlog position.