mumrah commented on code in PR #19262:
URL: https://github.com/apache/kafka/pull/19262#discussion_r2012156078


##########
metadata/src/test/java/org/apache/kafka/controller/QuorumControllerTest.java:
##########
@@ -654,6 +658,19 @@ public void testMinIsrUpdateWithElr() throws Throwable {
 
             // Unfence all brokers and create a topic foo (min ISR 2)
             sendBrokerHeartbeatToUnfenceBrokers(active, allBrokers, 
brokerEpochs);
+            AtomicBoolean onlyKeepUnfenced = new AtomicBoolean(false);
+            exec.scheduleAtFixedRate(() -> {

Review Comment:
   What was the underlying problem with sending the heartbeat sync'ly 
throughout the test? Was it a timing issue or some kind of race?



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