HyukjinKwon commented on issue #24958: [SPARK-28153][PYTHON] Use AtomicReference at InputFileBlockHolder (to support input_file_name with Python UDF) URL: https://github.com/apache/spark/pull/24958#issuecomment-505497275 Ah, virtually yes. But using atomic at least will guard the safety between child and the parent thread. For instance, the case an UDF launches another thread
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