chenyulin0719 commented on code in PR #18513:
URL: https://github.com/apache/kafka/pull/18513#discussion_r1938869089


##########
core/src/test/scala/integration/kafka/api/PlaintextAdminIntegrationTest.scala:
##########
@@ -4004,6 +3922,82 @@ class PlaintextAdminIntegrationTest extends 
BaseAdminIntegrationTest {
       ConfigSource.DYNAMIC_TOPIC_CONFIG, false, false, 
Collections.emptyList(), null, null),
       topicConfigs.get(TopicConfig.INDEX_INTERVAL_BYTES_CONFIG))
   }
+
+  class BackgroundConsumerSet(testGroupId: String, testClientId: String, 
defaultConsumerConfig: Properties) {
+    private val consumerSet: 
scala.collection.mutable.Set[Consumer[Array[Byte], Array[Byte]]] = 
scala.collection.mutable.Set.empty
+    private val consumerThreads: scala.collection.mutable.Set[Thread] = 
scala.collection.mutable.Set.empty
+    private var startLatch: CountDownLatch = new CountDownLatch(0)
+    private var stopLatch: CountDownLatch = new CountDownLatch(0)
+    private var consumerThreadRunning = new AtomicBoolean(false)
+
+    defaultConsumerConfig.setProperty(ConsumerConfig.GROUP_ID_CONFIG, 
testGroupId)
+    defaultConsumerConfig.setProperty(ConsumerConfig.CLIENT_ID_CONFIG, 
testClientId)
+
+    def addConsumer(groupInstanceId: String, topic: String, configOverrides: 
Properties = new Properties()): Unit = {
+      val newConsumerConfig = 
defaultConsumerConfig.clone().asInstanceOf[Properties]
+      if (groupInstanceId != "") {
+        // static member
+        newConsumerConfig.setProperty(ConsumerConfig.GROUP_INSTANCE_ID_CONFIG, 
groupInstanceId)
+      }
+      newConsumerConfig.putAll(configOverrides)
+
+      val consumer = createConsumer(configOverrides = newConsumerConfig)
+      val consumerThread = createConsumerThread(consumer, topic)
+      consumerSet.add(consumer)

Review Comment:
   Remove `consumerThread.interrupt()` from `close()`, only call 
`consumerThread.join()` to ensure the consumer threads are stopped correctly.
   
   Still keep `consumerSet` so we can use `consumer.wakeup()` in "app" thread.
   



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