To apply workaround you need to change database connection string in /etc/cinder.conf from
connection = mysql://user:password@db_host/cinder?charset=utf8&read_timeout=60
to
connection = mysql+pymysql://user:passwod@db_host/cinder?charset=utf8
To apply workaround you need to change database connection string in /etc/cinder.conf from
connection = mysql:/ /user:password@ db_host/ cinder? charset= utf8&read_ timeout= 60
to
connection = mysql+pymysql: //user: passwod@ db_host/ cinder? charset= utf8