ableegoldman commented on a change in pull request #11609:
URL: https://github.com/apache/kafka/pull/11609#discussion_r789561299



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamsMetadataState.java
##########
@@ -324,6 +345,45 @@ private void rebuildMetadata(final Map<HostInfo, 
Set<TopicPartition>> activePart
             return;
         }
 
+        allMetadata = topologyMetadata.hasNamedTopologies() ?
+            rebuildMetadataForNamedTopologies(activePartitionHostMap, 
standbyPartitionHostMap) :
+            rebuildMetadataForSingleTopology(activePartitionHostMap, 
standbyPartitionHostMap);
+    }
+
+    private List<StreamsMetadata> rebuildMetadataForNamedTopologies(final 
Map<HostInfo, Set<TopicPartition>> activePartitionHostMap,
+                                                                    final 
Map<HostInfo, Set<TopicPartition>> standbyPartitionHostMap) {
+        final List<StreamsMetadata> rebuiltMetadata = new ArrayList<>();
+        Stream.concat(activePartitionHostMap.keySet().stream(), 
standbyPartitionHostMap.keySet().stream())
+            .distinct()
+            .forEach(hostInfo -> {
+                final Set<TopicPartition> activePartitionsOnHost = new 
HashSet<>();
+                final Set<TopicPartition> standbyPartitionsOnHost = new 
HashSet<>();
+
+                final Map<String, Set<String>> storeNamesByTopology = new 
HashMap<>();
+                final Map<String, Set<String>> standbyStoreNamesByTopology = 
new HashMap<>();
+
+                topologyMetadata.namedTopologiesView().forEach(topologyName -> 
{
+                    // WIP 
+                });
+
+                final NamedTopologyStreamsMetadataImpl metadata = new 
NamedTopologyStreamsMetadataImpl(
+                    hostInfo,
+                    storeNamesByTopology,

Review comment:
       See the latest changes -- lmk if you still have a question here




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