cmccabe commented on code in PR #18148:
URL: https://github.com/apache/kafka/pull/18148#discussion_r1911567192


##########
metadata/src/main/java/org/apache/kafka/controller/BrokersToElrs.java:
##########
@@ -158,4 +158,9 @@ BrokersToIsrs.PartitionsOnReplicaIterator 
partitionsWithBrokerInElr(int brokerId
         }
         return new BrokersToIsrs.PartitionsOnReplicaIterator(topicMap, false);
     }
+
+    @SuppressWarnings("unchecked")
+    BrokersToIsrs.PartitionsOnReplicaIterator partitionsWithElr() {
+        return new 
BrokersToIsrs.PartitionsOnReplicaIterator(elrMembers.values().stream().map(m -> 
(Map<Uuid, int[]>) m).iterator(), false);

Review Comment:
   You cannot materialize all the partitions in the system like this. It will 
be disastrous for performance.
   
   If you need this, write a real iterator that materializes one element at a 
time.



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