`load_schema` race

These lines result in an index exception, trying to connect to the instance that actively applies DDL due to the race with the tarantool object creation:

https://github.com/tarantool/tarantool-python/blob/28310fc4e927c77d3be75e98360bf3b09f72482a/tarantool/connection.py#L1409-L1410

As these two fetches are non-transactional, the second one can return an index for space that is not fetched at the first fetch, resulting in:

Traceback (most recent call last):
  File "/python/lib/python3.11/site-packages/tarantool/connection.py", line 1097, in connect
    self.load_schema()
  File "/python/lib/python3.11/site-packages/tarantool/connection.py", line 1316, in load_schema
    self.schema.fetch_index_all()
  File "/python/lib/python3.11/site-packages/tarantool/schema.py", line 377, in fetch_index_all
    SchemaIndex(row, self.schema[row[0]])

Inizia in tarantool/connection.py, alle righe collegate intorno a 1409-1410, poi segui load_schema in tarantool/schema.py e fetch_index_all nella chiamata che fallisce. Riproduci il caso di creazione concorrente di oggetti Tarantool e analizza come interagiscono i due recuperi non transazionali. Il lavoro è completato quando load_schema non solleva più un’eccezione di indice e gestisce uno schema coerente.