kevin-wu24 commented on code in PR #18949:
URL: https://github.com/apache/kafka/pull/18949#discussion_r1980252103


##########
core/src/main/scala/kafka/server/DynamicBrokerConfig.scala:
##########
@@ -192,6 +197,37 @@ object DynamicBrokerConfig {
     }
     props
   }
+
+  private[server] def readDynamicBrokerConfigsFromSnapshot(
+    raftManager: KafkaRaftManager[ApiMessageAndVersion],
+    config: KafkaConfig,
+    quotaManagers: QuotaFactory.QuotaManagers
+  ): Unit = {
+    raftManager.replicatedLog.latestSnapshotId().ifPresent(latestSnapshotId => 
{
+      
raftManager.replicatedLog.readSnapshot(latestSnapshotId).ifPresent(rawSnapshotReader
 => {
+        val reader = RecordsSnapshotReader.of(
+          rawSnapshotReader,
+          raftManager.recordSerde,
+          BufferSupplier.create(),
+          KafkaRaftClient.MAX_BATCH_SIZE_BYTES,
+          true
+        )
+        val dynamicBrokerConfigs = new Properties()
+        while (reader.hasNext) {
+          val batch = reader.next()
+          batch.forEach(record => {
+            if (record.message().apiKey() == 
MetadataRecordType.CONFIG_RECORD.id) {
+              val configRecord = record.message().asInstanceOf[ConfigRecord]
+              if 
(DynamicBrokerConfig.AllDynamicConfigs.contains(configRecord.name())) {

Review Comment:
   > This is not quite right, because you aren't distinguishing between broker 
configurations and other kinds of configuration. 
   
   Yeah I looked at `DynamicConfigPublisher`. I think when I get the 
`ConfigRecord`, I need to check that its `resourceType` is for `BROKER` and 
only put those configs in `dynamicBrokerConfigs`. Then whether or not we update 
cluster defaults/per-broker is based on if `resourceName` is empty or contains 
the broker's id.



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