Eric Liang created SPARK-23971:

             Summary: Should not leak Spark sessions across test suites
                 Key: SPARK-23971
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Eric Liang

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.

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