ableegoldman commented on a change in pull request #9446:
URL: https://github.com/apache/kafka/pull/9446#discussion_r506618643



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamsPartitionAssignor.java
##########
@@ -409,9 +396,18 @@ public GroupAssignment assign(final Cluster metadata, 
final GroupSubscription gr
                 minSupportedMetadataVersion,
                 versionProbing,
                 probingRebalanceNeeded
-        );
+            );
 
-        return new GroupAssignment(assignment);
+            return new GroupAssignment(assignment);
+        } catch (final MissingSourceTopicException e) {
+            return new GroupAssignment(
+                errorAssignment(clientMetadataMap, 
AssignorError.INCOMPLETE_SOURCE_TOPIC_METADATA.code())
+            );
+        } catch (final TaskAssignmentException e) {
+            return new GroupAssignment(
+                errorAssignment(clientMetadataMap, 
AssignorError.ASSIGNMENT_ERROR.code())

Review comment:
       In my experience, users would not check the logs of every single 
instance, especially if the first set of logs they checked states very clearly 
what the problem is -- even if it makes no sense




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