HyukjinKwon opened a new pull request #30277: URL: https://github.com/apache/spark/pull/30277
### What changes were proposed in this pull request? This PR proposes to fix PySpark to officially support Python 3.9. The main codes already work. We should just note that we support Python 3.9. Also, this PR fixes some minor fixes into the test codes. - `Thread.isAlive` is removed in Python 3.9, and `Thread.is_alive` exists in Python 3.6+, see https://docs.python.org/3/whatsnew/3.9.html#removed - Fixed `TaskContextTestsWithWorkerReuse.test_barrier_with_python_worker_reuse` and `TaskContextTests.test_barrier` to be less flaky. This becomes more flaky in Python 3.9 for some reasons. NOTE that PyArrow does not support Python 3.9 yet. ### Why are the changes needed? To officially support Python 3.9. ### Does this PR introduce _any_ user-facing change? Yes, it officially supports Python 3.9. ### How was this patch tested? Manually ran the tests: ``` $ ./run-tests --python-executable=python Running PySpark tests. Output is in /.../spark/python/unit-tests.log Will test against the following Python executables: ['python'] Will test the following Python modules: ['pyspark-core', 'pyspark-ml', 'pyspark-mllib', 'pyspark-resource', 'pyspark-sql', 'pyspark-streaming'] python python_implementation is CPython python version is: Python 3.9.0 Starting test(python): pyspark.ml.tests.test_base Starting test(python): pyspark.ml.tests.test_evaluation Starting test(python): pyspark.ml.tests.test_algorithms Starting test(python): pyspark.ml.tests.test_feature Finished test(python): pyspark.ml.tests.test_base (12s) Starting test(python): pyspark.ml.tests.test_image Finished test(python): pyspark.ml.tests.test_evaluation (15s) Starting test(python): pyspark.ml.tests.test_linalg Finished test(python): pyspark.ml.tests.test_feature (25s) Starting test(python): pyspark.ml.tests.test_param Finished test(python): pyspark.ml.tests.test_image (17s) Starting test(python): pyspark.ml.tests.test_persistence Finished 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pyspark.sql.tests.test_dataframe Finished test(python): pyspark.sql.tests.test_conf (11s) Starting test(python): pyspark.sql.tests.test_datasources Finished test(python): pyspark.sql.tests.test_datasources (19s) Starting test(python): pyspark.sql.tests.test_functions Finished test(python): pyspark.sql.tests.test_dataframe (35s) ... 3 tests were skipped Starting test(python): pyspark.sql.tests.test_group Finished test(python): pyspark.sql.tests.test_functions (32s) Starting test(python): pyspark.sql.tests.test_pandas_cogrouped_map Finished test(python): pyspark.sql.tests.test_pandas_cogrouped_map (1s) ... 15 tests were skipped Starting test(python): pyspark.sql.tests.test_pandas_grouped_map Finished test(python): pyspark.sql.tests.test_group (19s) Starting test(python): pyspark.sql.tests.test_pandas_map Finished test(python): pyspark.sql.tests.test_pandas_grouped_map (0s) ... 21 tests were skipped Starting test(python): pyspark.sql.tests.test_pandas_udf Finished test(python): 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pyspark.sql.streaming Finished test(python): pyspark.sql.pandas.map_ops (12s) Starting test(python): pyspark.sql.types Finished test(python): pyspark.sql.types (10s) Starting test(python): pyspark.sql.udf Finished test(python): pyspark.sql.streaming (16s) Starting test(python): pyspark.sql.window Finished test(python): pyspark.sql.session (19s) Starting test(python): pyspark.streaming.util Finished test(python): pyspark.streaming.util (0s) Starting test(python): pyspark.util Finished test(python): pyspark.util (0s) Finished test(python): pyspark.sql.readwriter (24s) Finished test(python): pyspark.sql.udf (13s) Finished test(python): pyspark.sql.window (14s) Tests passed in 780 seconds ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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