`load_schema` race

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#333 opened on Nov 8, 2025 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 48/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: python
Domain: database

Research direction

Start in tarantool/connection.py at the linked lines around 1409-1410, then follow load_schema into tarantool/schema.py and fetch_index_all at the failing call. Reproduce the concurrent Tarantool object-creation case and inspect how the two non-transactional fetches interact. Done means load_schema no longer raises an index exception and handles a consistent schema.

Written by the indexing model from the issue text.

Description

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]])

Dominant language: Python
Stars: 108
Forks: 51
Avg merge: 1d 8h
Merged PRs (30d): 1

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