Timeout error while taking image snapshot of running instance of larger size

Issue

• Timeout error while taking image snapshot of running instance of larger size.

  keystonemiddleware.auth_token [-] Identity response: {"error": {"message": "Could not find token: 2a6afeebf44b4e16b62eafe9c750f327", "code": 404, "title": "Not Found"}}
  WARNING keystonemiddleware.auth_token [-] Authorization failed for token
  

• Messaging timeout

  oslo_db.sqlalchemy.exc_filters InternalError: (1205, u'Lock wait timeout exceeded; try restarting transaction')
  ERROR oslo_db.sqlalchemy.exc_filters 
  CRITICAL keystone [-] DBError: (pymysql.err.InternalError) (1205, u'Lock wait timeout exceeded; try restarting transaction') [SQL: u'DELETE FROM token WHERE token.expires <= %s'] [parameters: (datetime.datetime(2017, 5, 29, 17, 52, 39),)]