jerqi commented on code in PR #1710:
URL: 
https://github.com/apache/incubator-uniffle/pull/1710#discussion_r1599824460


##########
common/src/main/java/org/apache/uniffle/common/util/RssUtils.java:
##########
@@ -274,6 +274,14 @@ public static String generatePartitionKey(String appId, 
Integer shuffleId, Integ
         Constants.KEY_SPLIT_CHAR, appId, String.valueOf(shuffleId), 
String.valueOf(partition));
   }
 
+  public static <T> T loadExtension(Class<T> extCls, String clsPackage, Object 
obj) {
+    List<T> exts = loadExtensions(extCls, Arrays.asList(clsPackage), obj);
+    if (exts != null && exts.size() == 1) {
+      return exts.get(0);
+    }
+    return null;

Review Comment:
   What will it happen if we have two extensions?



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