ableegoldman commented on a change in pull request #9648:
URL: https://github.com/apache/kafka/pull/9648#discussion_r529798140



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/ProcessorTopology.java
##########
@@ -149,24 +149,30 @@ public boolean hasPersistentGlobalStore() {
         return false;
     }
 
-    public void updateSourceTopics(final Map<String, List<String>> 
sourceTopicsByName) {
-        if (!sourceTopicsByName.keySet().equals(sourceNodesByName.keySet())) {
-            log.error("Set of source nodes do not match: \n" +
-                "sourceNodesByName = {}\n" +
-                "sourceTopicsByName = {}",
-                sourceNodesByName.keySet(), sourceTopicsByName.keySet());
-            throw new IllegalStateException("Tried to update source topics but 
source nodes did not match");
-        }
+    public void updateSourceTopics(final Map<String, List<String>> 
allSourceTopicsByNodeName) {

Review comment:
       I modified the existing test rather than add a new one, and verified 
that the modified test does fail without the changes. Since the original test 
wasn't actually testing anything prior to the modifications I thought it made 
sense to fix the test rather than add a new one and retain a useless test in 
addition




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