Github user BryanCutler commented on a diff in the pull request:
https://github.com/apache/spark/pull/18695#discussion_r130668860
--- Diff: python/pyspark/broadcast.py ---
@@ -139,6 +140,24 @@ def __reduce__(self):
return _from_id, (self._jbroadcast.id(),)
+class BroadcastPickleRegistry(threading.local):
--- End diff --
Using the lock was a little more obvious what is going on, but it's better
to not use a lock in case of pickling a large command like @viirya said. Also,
this way doesn't need to change any of the pickling code, so I prefer it too.
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