HyukjinKwon edited a comment on issue #24946: [SPARK-27234][SS][PYTHON] Use 
InheritableThreadLocal for current epoch in EpochTracker (to support Python 
UDFs)
URL: https://github.com/apache/spark/pull/24946#issuecomment-505662431
 
 
   In case of `org.apache.spark.TaskContext`, looks it's manually set for 
Python's writer thread:
   
   
https://github.com/apache/spark/blob/6d441dcdc68dae886e375794a55658f70cd18d9d/core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala#L203
   
   and the information are (de)serialized into Python worker, `TaskContext` 
instance is constructed and used.
   
   I think it works too but I thought it's better to isolate this logic out of 
Python. Python runners are in core and this code is in SQL FWIW. We should move 
the codes around to mimic this approach.

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