brandboat commented on code in PR #15659:
URL: https://github.com/apache/kafka/pull/15659#discussion_r1554519247


##########
tools/src/main/java/org/apache/kafka/tools/reassign/ReassignPartitionsCommand.java:
##########
@@ -654,6 +654,13 @@ static Map<TopicPartition, List<Integer>> 
getReplicaAssignmentForPartitions(Admi
                     res.put(tp, 
info.replicas().stream().map(Node::id).collect(Collectors.toList()));
             })
         );
+
+        if (!res.keySet().equals(partitions)) {
+            Set<TopicPartition> missingPartitions = new HashSet<>(partitions);
+            missingPartitions.removeAll(res.keySet());
+            throw new UnknownTopicOrPartitionException("Unable to find 
partition: " +
+                
missingPartitions.stream().map(TopicPartition::toString).collect(Collectors.joining(",
 ")));

Review Comment:
   Though I don't know why do we do this, but follow the pattern is a good 
choice. Thanks for the comment :smiley: 



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