Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/16454#discussion_r95258453
--- Diff: python/pyspark/sql/session.py ---
@@ -161,8 +161,8 @@ def getOrCreate(self):
with self._lock:
from pyspark.context import SparkContext
from pyspark.conf import SparkConf
- session = SparkSession._instantiatedContext
- if session is None:
+ session = SparkSession._instantiatedSession
+ if session is None or session._sc._jsc is None:
--- End diff --
#16519 adds `isStopped`, which I think is a better way of checking whether
the Spark context is valid than just checking whether `_jsc` is defined because
`_jsc` could be stopped.
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