ueshin commented on code in PR #53166:
URL: https://github.com/apache/spark/pull/53166#discussion_r2557526291
##########
python/pyspark/daemon.py:
##########
@@ -78,6 +70,19 @@ def worker(sock, authenticated):
return 1
exit_code = 0
+
+ # We don't know what could happen when we import the worker module. We
have to
+ # guarantee that no thread is spawned before we fork, so we have to import
the
+ # worker module after fork. For example, both pandas and pyarrow starts
some
+ # threads when they are imported.
+ if len(sys.argv) > 1 and sys.argv[1].startswith("pyspark"):
+ import importlib
+
+ worker_module = importlib.import_module(sys.argv[1])
Review Comment:
Just a QQ: Is it ok to call this multiple times? This `worker` function will
be called every UDF execution.
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