divijvaidya commented on code in PR #15133:
URL: https://github.com/apache/kafka/pull/15133#discussion_r1463200794
##########
core/src/test/scala/unit/kafka/utils/TestUtils.scala:
##########
@@ -1396,11 +1396,13 @@ object TestUtils extends Logging {
// Note: Call this method in the test itself, rather than the @AfterEach
method.
// Because of the assert, if assertNoNonDaemonThreads fails, nothing after
would be executed.
def assertNoNonDaemonThreads(threadNamePrefix: String): Unit = {
- val nonDaemonThreads = Thread.getAllStackTraces.keySet.asScala.filter { t
=>
- !t.isDaemon && t.isAlive && t.getName.startsWith(threadNamePrefix)
- }
- val threadCount = nonDaemonThreads.size
- assertEquals(0, threadCount, s"Found unexpected $threadCount NonDaemon
threads=${nonDaemonThreads.map(t => t.getName).mkString(", ")}")
+ var nonDemonThreads: mutable.Set[Thread] = mutable.Set.empty[Thread]
+ waitUntilTrue(() => {
+ nonDemonThreads = Thread.getAllStackTraces.keySet.asScala.filter { t =>
+ !t.isDaemon && t.isAlive && t.getName.startsWith(threadNamePrefix)
+ }
+ 0 == nonDemonThreads.size
+ }, s"Found unexpected ${nonDemonThreads.size} NonDaemon
threads=${nonDemonThreads.map(t => t.getName).mkString(", ")}", 1000)
Review Comment:
BTW, which threads do you think are closed async during Kafka server
shutdown? AFAIK, we have checks in place to ensure that we wait for proper
close during shutdown
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