GitHub user ericl opened a pull request:
https://github.com/apache/spark/pull/21058
[SPARK-23971] Should not leak Spark sessions across test suites
## What changes were proposed in this pull request?
Many suites currently leak Spark sessions (sometimes with stopped
SparkContexts) via the thread-local active Spark session and default Spark
session. We should attempt to clean these up and detect when this happens to
improve the reproducibility of tests.
## How was this patch tested?
Existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ericl/spark clear-session
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21058.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 #21058
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commit 92afcc2f7a5dfb2bc5aa94e009ef1787f42a83ab
Author: Eric Liang <ekl@...>
Date: 2018-04-12T19:43:48Z
clear session
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