guozhangwang commented on a change in pull request #10788:
URL: https://github.com/apache/kafka/pull/10788#discussion_r682861544



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/ActiveTaskCreator.java
##########
@@ -64,6 +65,9 @@
     private final Map<TaskId, StreamsProducer> taskProducers;
     private final StreamThread.ProcessingMode processingMode;
 
+    // tasks may be assigned for a NamedTopology that is not yet known by this 
host, and saved for later creation
+    private final Map<TaskId, Set<TopicPartition>>  unknownTasksToBeCreated = 
new HashMap<>();

Review comment:
       Yeah I left this comment before syncing with @ableegoldman offline, so 
it's better to clarify for others reading this PR :)




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