InnoDB: Error: Table “mysql”.“innodb_table_stats” not found I've got the same error, although I'm running galera cluster with 3 nodes.
I tried following the instructions from InnoDB: Error: Table &quot;mysql&quot;.&quot;innodb_table_stats&quot; not found after upgrade to mysql 5.6 but when I get to the step of running the create statements, I get the following error:

Error Code: 1813. Tablespace for table '`mysql`.`innodb_index_stats`' exists.
Please DISCARD the tablespace before IMPORT.


This made no sense to me, and when I tried to use 

drop tablespace `innodb_index_stats`;


I got an SQL sysntax error.
The problem is actually very simple. Here is what happened

When you installed MySQL, the 5 InnoDB systems tables exist in two places


inside /var/lib/mysql/mysql as 5 .frm and 5 .ibd files
inside the data dictionary within ibdata1 (InnoDB System Tablespace)


At some point in your installation, you must have deleted ibdata1. This left the 10 InnoDB system table files inside /var/lib/mysql/mysql with no data dictionary entry.

SOLUTION

cd /var/lib/mysql/mysql
rm -f innodb_index_stats.frm
rm -f innodb_index_stats.ibd
rm -f innodb_table_stats.frm
rm -f innodb_table_stats.ibd
rm -f slave_master_info.frm
rm -f slave_master_info.ibd
rm -f slave_relay_log_info.frm
rm -f slave_relay_log_info.ibd
rm -f slave_worker_info.frm
rm -f slave_worker_info.ibd


Then, login to MySQL and run the steps from my post : InnoDB: Error: Table &quot;mysql&quot;.&quot;innodb_table_stats&quot; not found after upgrade to mysql 5.6

GIVE IT A TRY !!!