Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/1606#discussion_r15436589
--- Diff: python/pyspark/context.py ---
@@ -249,17 +258,14 @@ def defaultMinPartitions(self):
"""
return self._jsc.sc().defaultMinPartitions()
- def __del__(self):
--- End diff --
Because we keep a reference to this object in
`SparkContext._active_spark_context`, this method never gets called except when
cleaning up after a `SparkContext` creation attempt that failed because another
context was already running. In that case, the call to `sc.stop()` clears
`SparkContext._active_spark_context` and we lose track of the active context,
which can allow the creation of multiple running contexts.
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