I was surprised to find on a customer MySQL server this new syntax for Master_host in SHOW SLAVE STATUS.
mysql> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
Slave_IO_State: Connecting to master
Master_Host: testdb1.xxx.com or 10.XXX.XX.XXX
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: db1-354215-bin-log.000005
Read_Master_Log_Pos: 1624
Relay_Log_File: db2-354214-relay-log.000001
Is this a fancy new Percona Server feature? No. It’s operator error.
We read a little further to find.
mysql> SHOW SLAVE STATUS\G
...
Slave_IO_Running: Connecting
...
Last_IO_Errno: 2005
Last_IO_Error: error connecting to master 'repl@ testdb1.xxx.com or 10.XXX.XX.XXX' - retry-time: 60 retries: 86400
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