Github user viirya commented on the issue: https://github.com/apache/spark/pull/17282 This fixing is not in correct direction. The root cause is `coalesce` uses wrong `jrdd_deserializer` when constructing new `RDD`. The correct fixing looks like: diff --git a/python/pyspark/rdd.py b/python/pyspark/rdd.py index a5e6e2b..291c1ca 100644 --- a/python/pyspark/rdd.py +++ b/python/pyspark/rdd.py @@ -2072,10 +2072,12 @@ class RDD(object): batchSize = min(10, self.ctx._batchSize or 1024) ser = BatchedSerializer(PickleSerializer(), batchSize) selfCopy = self._reserialize(ser) + jrdd_deserializer = selfCopy._jrdd_deserializer jrdd = selfCopy._jrdd.coalesce(numPartitions, shuffle) else: + jrdd_deserializer = self._jrdd_deserializer jrdd = self._jrdd.coalesce(numPartitions, shuffle) - return RDD(jrdd, self.ctx, self._jrdd_deserializer) + return RDD(jrdd, self.ctx, jrdd_deserializer)
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