viirya commented on a change in pull request #24958: [SPARK-28153][PYTHON] Use
AtomicReference at InputFileBlockHolder (to support input_file_name with Python
UDF)
URL: https://github.com/apache/spark/pull/24958#discussion_r297196692
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File path: core/src/main/scala/org/apache/spark/rdd/InputFileBlockHolder.scala
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@@ -41,25 +43,26 @@ private[spark] object InputFileBlockHolder {
* The thread variable for the name of the current file being read. This is
used by
* the InputFileName function in Spark SQL.
Review comment:
It may not intuitive to understand this thread local variable now, can we
add a short comment to explain why an `AtomicReference` here?
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