[BRANCH-1.1][SPARK-2652] change the default spark.serializer in pyspark back to Kryo#3187
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mengxr wants to merge 1 commit intoapache:branch-1.1from
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[BRANCH-1.1][SPARK-2652] change the default spark.serializer in pyspark back to Kryo#3187mengxr wants to merge 1 commit intoapache:branch-1.1from
mengxr wants to merge 1 commit intoapache:branch-1.1from