GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/21197
[SPARK-23971] [BACKPORT-2.3] Should not leak Spark sessions across test
suites
This PR is to backport the PR https://github.com/apache/spark/pull/21058 to
Apache 2.3. This should be the cause why we saw the test regressions in Apache
2.3 branches:
https://amplab.cs.berkeley.edu/jenkins/job/spark-branch-2.3-test-sbt-hadoop-2.6/317/testReport/org.apache.spark.sql.execution.datasources.parquet/ParquetQuerySuite/SPARK_15678__not_use_cache_on_overwrite/history/
https://amplab.cs.berkeley.edu/jenkins/job/spark-branch-2.3-test-sbt-hadoop-2.7/318/testReport/junit/org.apache.spark.sql/DataFrameSuite/inputFiles/history/
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## 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/gatorsmile/spark backportSPARK-23971
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21197.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 #21197
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commit c1c63776687eef0be8f2675b3c247f793b9ea05e
Author: Eric Liang <ekl@...>
Date: 2018-04-13T05:30:59Z
[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
Author: Eric Liang <[email protected]>
Closes #21058 from ericl/clear-session.
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