Github user BryanCutler commented on a diff in the pull request:
https://github.com/apache/spark/pull/14959#discussion_r82649091
--- Diff: python/pyspark/context.py ---
@@ -121,7 +121,15 @@ def __init__(self, master=None, appName=None,
sparkHome=None, pyFiles=None,
def _do_init(self, master, appName, sparkHome, pyFiles, environment,
batchSize, serializer,
conf, jsc, profiler_cls):
self.environment = environment or {}
- self._conf = conf or SparkConf(_jvm=self._jvm)
+ # java gateway must have been launched at this point.
+ if conf is not None and conf._jconf:
--- End diff --
Maybe also change this to `and conf._jconf is not None`
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