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https://issues.apache.org/jira/browse/BEAM-12985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17422413#comment-17422413
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Brian Hulette commented on BEAM-12985:
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Based on [this issue|https://github.com/pytest-dev/pytest/issues/9121], it
seems the -m behavior is intentional.
> pyarrow tests are executed twice in py38-pyarrow-x tox task
> -----------------------------------------------------------
>
> Key: BEAM-12985
> URL: https://issues.apache.org/jira/browse/BEAM-12985
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core, testing
> Reporter: Brian Hulette
> Priority: P2
>
> {{tox -e py37-pyarrow-2}} runs all tests with the "uses_pyarrow" mark twice.
> This is because run_pytest.sh [runs pytest
> twice|https://github.com/apache/beam/blob/6beeafff496f69499cdb14bd58c6ac2d9e84d116/sdks/python/scripts/run_pytest.sh#L33],
> once with {{-m no_xdist}} and once with {{-m 'not no_xdist'}}. The pyarrow
> task uses [-m
> uses_pyarrow|https://github.com/apache/beam/blob/6beeafff496f69499cdb14bd58c6ac2d9e84d116/sdks/python/tox.ini#L249]
> to select tests, but pytest only respects the latest -m argument. So the
> no_xdist parameters are ignored, and _all_ pyarrow tests are run each time.
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