guozhangwang commented on a change in pull request #11479:
URL: https://github.com/apache/kafka/pull/11479#discussion_r750797917



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamThread.java
##########
@@ -908,20 +908,25 @@ private void initializeAndRestorePhase() {
 
     // Check if the topology has been updated since we last checked, ie via 
#addNamedTopology or #removeNamedTopology
     private void checkForTopologyUpdates() {
-        if (lastSeenTopologyVersion < topologyMetadata.topologyVersion() || 
topologyMetadata.isEmpty()) {
-            lastSeenTopologyVersion = topologyMetadata.topologyVersion();
-            taskManager.handleTopologyUpdates();
-
+        do {
             topologyMetadata.maybeWaitForNonEmptyTopology(() -> state);
+            if (lastSeenTopologyVersion < topologyMetadata.topologyVersion()) {

Review comment:
       As for completing the `future` objects: I think it's okay to let the 
first future be waiting a bit more if there are consecutive operations, i.e. in 
the above implementation we would complete all futures that have been 
registered so far when we eventually get every still-alive threads to catch up 
with the bumped version.




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