chia7712 commented on code in PR #23343:
URL: https://github.com/apache/kafka/pull/23343#discussion_r3997288105


##########
clients/clients-integration-tests/src/test/java/org/apache/kafka/clients/ClientRebootstrapTest.java:
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@@ -66,17 +65,15 @@ public void testAdminRebootstrap(ClusterInstance 
clusterInstance) {
             admin.createTopics(List.of(new NewTopic(TOPIC, PARTITIONS, (short) 
REPLICAS)));
 
             // Only the broker 1 is available for the admin client during the 
bootstrap.
-            var topics = assertDoesNotThrow(() -> 
admin.listTopics().names().get(timeout, TimeUnit.SECONDS));
-            assertTrue(topics.contains(TOPIC));
+            TestUtils.waitForCondition(() -> admin.listTopics().names().get(5, 
TimeUnit.SECONDS).contains(TOPIC), timeout * 1000, "Topic not visible after 
creation");
 
             clusterInstance.shutdownBroker(broker1);
             clusterInstance.startBroker(broker0);
 
             // The broker 1, originally cached during the bootstrap, is 
offline.
             // However, the broker 0 from the bootstrap list is online.
             // Should be able to list topics again.
-            topics = assertDoesNotThrow(() -> 
admin.listTopics().names().get(timeout, TimeUnit.SECONDS));
-            assertTrue(topics.contains(TOPIC));
+            TestUtils.waitForCondition(() -> admin.listTopics().names().get(5, 
TimeUnit.SECONDS).contains(TOPIC), timeout * 1000, "Topic not visible after 
broker restart");

Review Comment:
   The topic metadata should have been synced already, right? 



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