Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/1460#discussion_r15137226
--- Diff: python/pyspark/serializers.py ---
@@ -297,6 +297,33 @@ class MarshalSerializer(FramedSerializer):
loads = marshal.loads
+class AutoSerializer(FramedSerializer):
+ """
+ Choose marshal or cPickle as serialization protocol autumatically
+ """
+ def __init__(self):
+ FramedSerializer.__init__(self)
+ self._type = None
+
+ def dumps(self, obj):
+ try:
+ if self._type is not None:
+ raise TypeError("fallback")
+ return 'M' + marshal.dumps(obj)
+ except Exception:
+ self._type = 'P'
+ return 'P' + cPickle.dumps(obj, -1)
--- End diff --
I had add an fast path for it, no exception cost any more.
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