Github user felixcheung commented on a diff in the pull request: https://github.com/apache/spark/pull/16454#discussion_r94904472 --- Diff: python/pyspark/sql/session.py --- @@ -214,8 +214,14 @@ def __init__(self, sparkContext, jsparkSession=None): self._wrapped = SQLContext(self._sc, self, self._jwrapped) _monkey_patch_RDD(self) install_exception_handler() - if SparkSession._instantiatedContext is None: - SparkSession._instantiatedContext = self + if SparkSession._instantiatedSession is None: + SparkSession._instantiatedSession = self + else: + # If we had an instantiated SparkSession attached with a SparkContext + # which is stopped now, we need to renew the instantiated SparkSession. + # Otherwise, we will use invalid SparkSession when we call Builder.getOrCreate. + if SparkSession._instantiatedSession._sc._jsc is None: + SparkSession._instantiatedSession = self --- End diff -- Can SparkSession._instantiatedSession._sc is None?
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