sunchao commented on pull request #29843:
URL: https://github.com/apache/spark/pull/29843#issuecomment-698402391


   Hmm interesting. There is still one Python test in YARN failing with:
   
   ```
   Exception: Python in worker has different version 3.6 than that in driver 
3.8, PySpark cannot run with different minor versions. Please check environment 
variables PYSPARK_PYTHON and PYSPARK_DRIVER_PYTHON are correctly set.
   ```
   
   after I changed `YarnClusterSuite` to use python3. Seems we've already 
specified to use 3.8 in the [CI 
config](https://github.com/apache/spark/blob/master/.github/workflows/build_and_test.yml#L150),
 so not sure why that happens. @HyukjinKwon any hint? Thanks.


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