Comment 3 for bug 1206565

So, the solution to this is to add a SST option to use extra_port and use that extra port (after detection of threadpool) with innobackupex like

innobackupex --host --port ..

This will make innobackupex use TCP on extra_port.

Note that, since innobackupex uses mysql just for obtaining status variables. This shouldn't last long or cause any issues.

Moreso, the extra_port is specifically meant for maintenance and/or admn tasks like backups.

Also, it would be recommended to have extra_port set to 2 or more (than default 1), so that while one is being used for backup, the other can be used for logging through client (if necessary).