Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19893#discussion_r159954589
--- Diff: core/src/test/scala/org/apache/spark/SparkFunSuite.scala ---
@@ -27,19 +27,55 @@ import org.apache.spark.util.AccumulatorContext
/**
* Base abstract class for all unit tests in Spark for handling common
functionality.
+ *
+ * Thread audit happens normally here automatically when a new test suite
created.
+ * The only prerequisite for that is that the test class must extend
[[SparkFunSuite]].
+ *
+ * There are some test suites which are doing initialization before
[[SparkFunSuite#beforeAll]]
+ * executed. This case auditing can be moved into another place in the
call sequence.
+ *
+ * To do the audit in a custom place/way the following can be done:
+ *
+ * class MyTestSuite extends SparkFunSuite {
+ *
+ * override val doThreadAuditInSparkFunSuite = false
--- End diff --
`enableAutoThreadAudit` now
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