The-Gamer-01 commented on code in PR #15620:
URL: https://github.com/apache/kafka/pull/15620#discussion_r1573677249


##########
storage/src/main/java/org/apache/kafka/server/log/remote/metadata/storage/serialization/RemoteLogMetadataSerde.java:
##########
@@ -74,25 +72,24 @@ protected final Map<Short, RemoteLogMetadataTransform> 
createRemoteLogMetadataTr
         return map;
     }
 
-    protected final Map<String, Short> 
createRemoteLogStorageClassToApiKeyMap() {
-        Map<String, Short> map = new HashMap<>();
-        map.put(RemoteLogSegmentMetadata.class.getName(), 
REMOTE_LOG_SEGMENT_METADATA_API_KEY);
-        map.put(RemoteLogSegmentMetadataUpdate.class.getName(), 
REMOTE_LOG_SEGMENT_METADATA_UPDATE_API_KEY);
-        map.put(RemotePartitionDeleteMetadata.class.getName(), 
REMOTE_PARTITION_DELETE_API_KEY);
-        map.put(RemoteLogSegmentMetadataSnapshot.class.getName(), 
REMOTE_LOG_SEGMENT_METADATA_SNAPSHOT_API_KEY);
-        return map;
-    }
-
     public byte[] serialize(RemoteLogMetadata remoteLogMetadata) {
-        Short apiKey = 
remoteLogStorageClassToApiKey.get(remoteLogMetadata.getClass().getName());
-        if (apiKey == null) {
-            throw new IllegalArgumentException("ApiKey for given 
RemoteStorageMetadata class: " + remoteLogMetadata.getClass()
-                                                       + " does not exist.");
-        }
 
-        @SuppressWarnings("unchecked")
-        ApiMessageAndVersion apiMessageAndVersion = 
remoteLogMetadataTransform(apiKey).toApiMessageAndVersion(remoteLogMetadata);
+        RemoteLogMetadataTransform metadataTransform;
+
+        if(remoteLogMetadata.getClass() == RemoteLogSegmentMetadata.class) {

Review Comment:
   Why this pr don't use **instanceof**



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