Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18695#discussion_r129516461
--- Diff: python/pyspark/context.py ---
@@ -195,7 +195,7 @@ def _do_init(self, master, appName, sparkHome, pyFiles,
environment, batchSize,
# This allows other code to determine which Broadcast instances
have
# been pickled, so it can determine which Java broadcast objects to
# send.
- self._pickled_broadcast_vars = set()
+ self._pickled_broadcast_registry =
BroadcastPickleRegistry(self._lock)
--- End diff --
Instead of using lock, how about use thread local data?
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