cryptoe commented on code in PR #16328:
URL: https://github.com/apache/druid/pull/16328#discussion_r1579149493


##########
server/src/main/java/org/apache/druid/query/lookup/LookupReferencesManager.java:
##########
@@ -373,10 +375,18 @@ private void takeSnapshot(Map<String, 
LookupExtractorFactoryContainer> lookupMap
     }
   }
 
-  private void loadAllLookupsAndInitStateRef()
+  /**
+   * Load a set of lookups based on the injected value in {@link 
DataSourceTaskIdHolder#getLookupsToLoad()}.
+   */
+  private void loadLookupsAndInitStateRef()
   {
     List<LookupBean> lookupBeanList = getLookupsList();
     if (lookupBeanList != null) {
+      final List<String> lookupsToLoad = 
lookupListeningAnnouncerConfig.getLookupsToLoad();
+      final boolean loadAllLookups = lookupsToLoad == null;
+      lookupBeanList = lookupBeanList.stream()

Review Comment:
   Nit: We should iterate only if lookupsToLoad is non empty.  Here you are 
always iterating over the lookup list. 



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