TomTJarosz commented on code in PR #39314:
URL: https://github.com/apache/arrow/pull/39314#discussion_r1433153177
##########
python/pyarrow/tests/test_pandas.py:
##########
@@ -4996,3 +4997,7 @@ def roundtrip(df, schema=None):
schema = pa.schema([("maps", map_type)])
roundtrip(pd.DataFrame({"maps": [map_of_los, map_of_los, map_of_los]}),
schema=schema)
+
+def test_is_data_frame_race_condition():
+ # See https://github.com/apache/arrow/issues/39313
+ test_util.invoke_script('arrow_39313.py')
Review Comment:
Note that the time window of this race condition starts with the first call
of `_check_import` within a python process, and ends when that first call
returns. Concurrent calls to `_check_import` in this time window can cause the
race condition.
Give arbitrary pytest/conftest code could call `_check_import`, we use
`invoke_script` to start a new subprocess, where we can be sure our test (which
reproduces the issue) call `_check_import` for the first time in that process.
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