Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/22545
@cloud-fan, do we target this 2.4? Looks it might break an existing app, in
particular, when a Python shell creates a session and another shell (like
Zeppelin) or another session depends on a configuration in spark context. For
instance, the fixed doctest:
```python
s1 = SparkSession.builder.config("k1", "v1").getOrCreate()
>>> s1 = SparkSession.builder.config("k1", "v1").getOrCreate()
>>> s1.conf.get("k1") == s1.sparkContext.getConf().get("k1") == "v1"
```
Looks like a bug but the behaviour change by this looks potentially quite
crucial.
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