Error

gistfile1.txt

 base_mapper, states, uowtransaction
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/orm/persistence.py", line 279, in _organize_states_for_save
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     states):
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/orm/persistence.py", line 1105, in _connections_for_states
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     connection = uowtransaction.transaction.connection(base_mapper)
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 294, in connection
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     return self._connection_for_bind(bind, execution_options)
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 392, in _connection_for_bind
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     conn = self._parent._connection_for_bind(bind, execution_options)
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 403, in _connection_for_bind
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     conn = bind.contextual_connect()
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 2112, in contextual_connect
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     self._wrap_pool_connect(self.pool.connect, None),
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 2147, in _wrap_pool_connect
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     return fn()
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/pool.py", line 387, in connect
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     return _ConnectionFairy._checkout(self)
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/pool.py", line 766, in _checkout
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     fairy = _ConnectionRecord.checkout(pool)
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/pool.py", line 516, in checkout
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     rec = pool._do_get()
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:   File "/home/ubuntu/prima_rndb/lib/python3.5/site-packages/sqlalchemy/pool.py", line 1131, in _do_get
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]:     (self.size(), self.overflow(), self._timeout))
Jul 14 07:08:49 ip-172-31-4-205 python3.5[3604]: sqlalchemy.exc.TimeoutError: QueuePool limit of size 20 overflow 0 reached, connection timed out, timeout 30