xijiu commented on code in PR #20064:
URL: https://github.com/apache/kafka/pull/20064#discussion_r2203782274


##########
tools/src/main/java/org/apache/kafka/tools/consumer/group/ConsumerGroupCommand.java:
##########
@@ -631,7 +635,34 @@ else if (logEndOffsetResult.getValue() instanceof 
OffsetsUtils.Ignore)
                     return null;
 
                 throw new IllegalStateException("Unknown LogOffset subclass: " 
+ logEndOffsetResult.getValue());
-            }).collect(Collectors.toList());
+            }).toList();
+
+            // prepare data for partitions without leaders
+            List<PartitionAssignmentState> noneLeaderAssignments = 
topicPartitionsWithoutLeader.stream()
+                    .map(tp -> getDescribePartitionResult.apply(tp, 
Optional.empty())).toList();
+
+            // concat the data and then sort them
+            return Stream.concat(existLeaderAssignments.stream(), 
noneLeaderAssignments.stream())
+                    .sorted(Comparator.<PartitionAssignmentState, 
String>comparing(
+                            state -> state.topic.orElse(""), String::compareTo)
+                            .thenComparingInt(state -> 
state.partition.orElse(-1)))

Review Comment:
   Yeah, the original logical ordering is invalid, and I added it 



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