Github user carsonwang commented on a diff in the pull request: https://github.com/apache/spark/pull/9991#discussion_r46014967 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/execution/ui/SQLListenerSuite.scala --- @@ -343,6 +343,8 @@ class SQLListenerMemoryLeakSuite extends SparkFunSuite { .set("spark.sql.ui.retainedExecutions", "50") // Set it to 50 to run this test quickly val sc = new SparkContext(conf) try { + // Clear the sql listener created by a previous test suite. + SQLContext.clearSqlListener() --- End diff -- I think we can add a SparkContext stop hook. When SparkContext is being stopped, clear the reference. The user doesn't have to call a method to clear the sqlListener reference. The sqlListener is added to SparkContext and will only be garbage collected when SparkContext is stopped.
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