GitHub user kxepal opened a pull request:
https://github.com/apache/spark/pull/15961
[SPARK-18523][PySpark]Make SparkContext.stop more reliable
## What changes were proposed in this pull request?
This PR fixes SparkContext broken state in which it may fall if spark
driver get crashed or killed by OOM.
## How was this patch tested?
1. Start SparkContext;
2. Find Spark driver process and `kill -9` it;
3. Call `sc.stop()`;
4. Create new SparkContext after that;
Without this patch you will crash on step 3 and won't be able to do step 4
without manual reset private attibutes or IPython notebook / shell restart.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kxepal/spark
18523-make-spark-context-stop-more-reliable
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15961.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15961
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