huxihx commented on a change in pull request #9051:
URL: https://github.com/apache/kafka/pull/9051#discussion_r458613980



##########
File path: 
core/src/test/scala/integration/kafka/server/DynamicBrokerReconfigurationTest.scala
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@@ -775,6 +775,24 @@ class DynamicBrokerReconfigurationTest extends 
ZooKeeperTestHarness with SaslSet
     verifyMarkPartitionsForTruncation()
   }
 
+  @Test
+  def testDefaultValueRestoredAfterDeleteDynamicConfig(): Unit = {
+    val newProps = new Properties
+    newProps.put(KafkaConfig.LogRetentionTimeMillisProp, "100000")
+    newProps.put(KafkaConfig.LogFlushIntervalMsProp, "10000")
+    TestUtils.incrementalAlterConfigs(servers, adminClients.head, newProps, 
perBrokerConfig = false).all.get

Review comment:
       Thanks for the comments. We could add but not necessary since we care 
about the fact that the value for broker-default level should be overwritten by 
that for broker-level. Does it make sense?




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