Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19893#discussion_r155609975
--- Diff: core/src/test/scala/org/apache/spark/SparkFunSuite.scala ---
@@ -34,12 +36,53 @@ abstract class SparkFunSuite
with Logging {
// scalastyle:on
+ val threadWhiteList = Set(
+ /**
+ * Netty related threads.
+ */
+ "netty.*",
+
+ /**
+ * A Single-thread singleton EventExecutor inside netty which creates
such threads.
+ */
+ "globalEventExecutor.*",
+
+ /**
+ * Netty creates such threads.
+ * Checks if a thread is alive periodically and runs a task when a
thread dies.
+ */
+ "threadDeathWatcher.*",
+
+ /**
+ * These threads are created by spark when internal RPC environment
initialized and later used.
--- End diff --
`TaskSetManagerSuite` extends `LocalSparkContext` which stops contexts in
its `afterEach` method, so if the context is not being stopped, or the threads
are not being stopped, there's an issue somewhere.
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