Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3121#issuecomment-62441660
It looks like this is now legitimately failing a PySpark test:
```python
class ContextTests(unittest.TestCase):
def test_failed_sparkcontext_creation(self):
# Regression test for SPARK-1550
self.assertRaises(Exception, lambda:
SparkContext("an-invalid-master-name"))
```
The problem here is that an invalid master causes an error to occur midway
through initialization, leaving the SparkContext in an inconsistent state.
This shows that it would be pretty easy for a user to fail to create a
SparkContext due to a bug and then become stuck.
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