prat0318 commented on a change in pull request #9682:
URL: https://github.com/apache/kafka/pull/9682#discussion_r535442782



##########
File path: core/src/main/scala/kafka/server/DynamicBrokerConfig.scala
##########
@@ -467,7 +467,9 @@ class DynamicBrokerConfig(private val kafkaConfig: 
KafkaConfig) extends Logging
             case _: Exception => true
           }
         }
-        invalidProps.foreach(props.remove)
+        invalidProps.foreach {

Review comment:
       done.

##########
File path: core/src/test/scala/unit/kafka/server/DynamicBrokerConfigTest.scala
##########
@@ -400,6 +400,33 @@ class DynamicBrokerConfigTest {
     newprops.put(KafkaConfig.BackgroundThreadsProp, "100")
     dynamicBrokerConfig.updateBrokerConfig(0, newprops)
   }
+
+  @Test
+  def testImproperConfigsAreRemoved(): Unit = {
+    val props = TestUtils.createBrokerConfig(0, TestUtils.MockZkConnect)
+    val configs = KafkaConfig(props)
+
+    assertEquals(Int.MaxValue, configs.maxConnections)
+    assertEquals(1048588, configs.messageMaxBytes)
+
+    var newProps = new Properties()
+    newProps.put(KafkaConfig.MaxConnectionsProp, "9999")
+    newProps.put(KafkaConfig.MessageMaxBytesProp, "2222")
+
+    configs.dynamicConfig.updateDefaultConfig(newProps)
+    assertEquals(9999, configs.maxConnections)
+    assertEquals(2222, configs.messageMaxBytes)
+
+    newProps = new Properties()
+    newProps.put(KafkaConfig.MaxConnectionsProp, "INVALID_INT")
+    newProps.put(KafkaConfig.MessageMaxBytesProp, "1111")
+
+    configs.dynamicConfig.updateDefaultConfig(newProps)
+    // Invalid value should be skipped and reassigned as Originals
+    assertEquals(Int.MaxValue, configs.maxConnections)

Review comment:
       done.

##########
File path: core/src/test/scala/unit/kafka/server/DynamicBrokerConfigTest.scala
##########
@@ -400,6 +400,33 @@ class DynamicBrokerConfigTest {
     newprops.put(KafkaConfig.BackgroundThreadsProp, "100")
     dynamicBrokerConfig.updateBrokerConfig(0, newprops)
   }
+
+  @Test
+  def testImproperConfigsAreRemoved(): Unit = {
+    val props = TestUtils.createBrokerConfig(0, TestUtils.MockZkConnect)
+    val configs = KafkaConfig(props)
+
+    assertEquals(Int.MaxValue, configs.maxConnections)
+    assertEquals(1048588, configs.messageMaxBytes)
+
+    var newProps = new Properties()
+    newProps.put(KafkaConfig.MaxConnectionsProp, "9999")
+    newProps.put(KafkaConfig.MessageMaxBytesProp, "2222")
+
+    configs.dynamicConfig.updateDefaultConfig(newProps)
+    assertEquals(9999, configs.maxConnections)
+    assertEquals(2222, configs.messageMaxBytes)
+
+    newProps = new Properties()
+    newProps.put(KafkaConfig.MaxConnectionsProp, "INVALID_INT")
+    newProps.put(KafkaConfig.MessageMaxBytesProp, "1111")
+
+    configs.dynamicConfig.updateDefaultConfig(newProps)
+    // Invalid value should be skipped and reassigned as Originals

Review comment:
       done.




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