If you deal with MySQL master/slaves a lot you may run into the following error.
Relay log read failure: Could not parse relay log event entry.
To fix this you will need to reset the slave and request a new copy of the bin logs from the master. Use the following procedure to do this.
1. STOP SLAVE
2. SHOW SLAVE STATUS – copy pasta to your notepad, pastebin, etc.
3. RESET SLAVE
4. CHANGE MASTER:
CHANGE MASTER TO MASTER_USER='slave', MASTER_PASSWORD='password', MASTER_HOST='host.example.com', MASTER_LOG_FILE='<relay_master_log_file>', MASTER_LOG_POS=<exec_master_log_pos>