[LIVY-1011] Upgrade CI image, fix Spark 3 tests #467
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**What changes were proposed in this pull request?** The CI environment is broken due to library version conflicts between the image and the checkout action. The livy-ci Docker image needs to be upgraded to a more recent version of Ubuntu, ensuring that the unit tests and integration tests all pass. Due to a bug in Livy's GitHub workflows, tests had only been executed with Spark 2. Now that this is fixed, we also need to make updates to some of the Python-based tests to work with Python 3 because Spark 3.2 does not support Python 2. Two R-based integration tests are ignored in the Spark 2 integration test runs because SparkR 2 does not work with R 4, and the last version of Ubuntu with R 3.6 is Ubuntu 20. If we want to re-enable these tests, we may need to build R 3.6 for Ubuntu 24. **How was this patch tested?** CI and unit test runs in a private fork of the repo.
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What changes were proposed in this pull request?
The CI environment is broken due to library version conflicts between the image and the checkout action.
The livy-ci Docker image needs to be upgraded to a more recent version of Ubuntu, ensuring that the unit tests and integration tests all pass.
Due to a bug in Livy's GitHub workflows, tests had only been executed with Spark 2. Now that this is fixed, we also need to make updates to some of the Python-based tests to work with Python 3 because Spark 3.2 does not support Python 2.
Two R-based integration tests are ignored in the Spark 2 integration test runs because SparkR 2 does not work with R 4, and the last version of Ubuntu with R 3.6 is Ubuntu 20. If we want to re-enable these tests, we may need to build R 3.6 for Ubuntu 24.
How was this patch tested?
CI and unit test runs in a private fork of the repo.