ijuma commented on a change in pull request #11036:
URL: https://github.com/apache/kafka/pull/11036#discussion_r672255739



##########
File path: core/src/main/scala/kafka/log/LogManager.scala
##########
@@ -403,27 +411,49 @@ class LogManager(logDirs: Seq[File],
    *  Start the background threads to flush logs and do log cleanup
    */
   def startup(topicNames: Set[String]): Unit = {
-    startupWithConfigOverrides(fetchTopicConfigOverrides(topicNames))
+    // ensure consistency between default config and overrides
+    val defaultConfig = currentDefaultConfig
+    startupWithConfigOverrides(defaultConfig, 
fetchTopicConfigOverrides(defaultConfig, topicNames))
   }
 
   // visible for testing
-  private[log] def fetchTopicConfigOverrides(topicNames: Set[String]): 
Map[String, LogConfig] = {
+  @nowarn("cat=deprecation")
+  private[log] def fetchTopicConfigOverrides(defaultConfig: LogConfig, 
topicNames: Set[String]): Map[String, LogConfig] = {
     val topicConfigOverrides = mutable.Map[String, LogConfig]()
-    val defaultProps = currentDefaultConfig.originals()
+    val defaultProps = defaultConfig.originals()
     topicNames.foreach { topicName =>
-      val overrides = configRepository.topicConfig(topicName)
+      var overrides = configRepository.topicConfig(topicName)

Review comment:
       Regarding unmodifiable `Properties`, there is no built-in way. My 
concern was something like the `MockConfigRepository` issue you found where 
copies are not done with the assumption that the caller should not mutate (even 
though there is no simple way to prevent that - another reason not to use 
`Properties`).




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