[2018-04-21 16:54:51,913: ERROR/MainProcess] Pool callback raised exception: OperationalError('(_mysql_exceptions.OperationalError) (2013, \'Lost connection to MySQL server at \\\'reading initial communication packet\\\', system error: 0 "Internal error/check (Not system error)"\')',)
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2158, in _wrap_pool_connect
    return fn()
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 403, in connect
    return _ConnectionFairy._checkout(self)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 788, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 532, in checkout
    rec = pool._do_get()
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 1284, in _do_get
    return self._create_connection()
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 350, in _create_connection
    return _ConnectionRecord(self)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 477, in __init__
    self.__connect(first_connect_check=True)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 671, in __connect
    connection = pool._invoke_creator(self)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py", line 106, in connect
    return dialect.connect(*cargs, **cparams)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 410, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/__init__.py", line 86, in Connect
    return Connection(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/connections.py", line 204, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
_mysql_exceptions.OperationalError: (2013, 'Lost connection to MySQL server at \'reading initial communication packet\', system error: 0 "Internal error/check (Not system error)"')