k-apol commented on code in PR #19913:
URL: https://github.com/apache/kafka/pull/19913#discussion_r2147033788


##########
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopicManager.java:
##########
@@ -461,15 +469,22 @@ public Set<String> makeReady(final Map<String, 
InternalTopicConfig> topics) {
         // have existed with the expected number of partitions, or some create 
topic returns fatal errors.
         log.debug("Starting to validate internal topics {} in partition 
assignor.", topics);
 
-        long currentWallClockMs = time.milliseconds();
+        final long currentWallClockMs = time.milliseconds();
         final long deadlineMs = currentWallClockMs + retryTimeoutMs;
+        final long initDeadlineMs = currentWallClockMs + 
this.initTimeout.toMillis();
 
         Set<String> topicsNotReady = new HashSet<>(topics.keySet());
         final Set<String> newlyCreatedTopics = new HashSet<>();
 
         while (!topicsNotReady.isEmpty()) {
             final Set<String> tempUnknownTopics = new HashSet<>();
             topicsNotReady = validateTopics(topicsNotReady, topics, 
tempUnknownTopics);
+
+            if (this.isManualInternalTopicConfig && !this.isInitializing) {
+                throw new MissingInternalTopicsException("Internal topic 
configuration set to MANUAL. \n" +
+                        "You must call init() to setup internal topics.", new 
ArrayList<>(topicsNotReady));
+            }
+
             newlyCreatedTopics.addAll(topicsNotReady);
 
             if (!topicsNotReady.isEmpty()) {

Review Comment:
   I think it's a good idea, we are making this method work really hard. He 
could use some pals to help him out



##########
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopicManager.java:
##########
@@ -461,15 +469,22 @@ public Set<String> makeReady(final Map<String, 
InternalTopicConfig> topics) {
         // have existed with the expected number of partitions, or some create 
topic returns fatal errors.
         log.debug("Starting to validate internal topics {} in partition 
assignor.", topics);
 
-        long currentWallClockMs = time.milliseconds();
+        final long currentWallClockMs = time.milliseconds();
         final long deadlineMs = currentWallClockMs + retryTimeoutMs;
+        final long initDeadlineMs = currentWallClockMs + 
this.initTimeout.toMillis();
 
         Set<String> topicsNotReady = new HashSet<>(topics.keySet());
         final Set<String> newlyCreatedTopics = new HashSet<>();
 
         while (!topicsNotReady.isEmpty()) {
             final Set<String> tempUnknownTopics = new HashSet<>();
             topicsNotReady = validateTopics(topicsNotReady, topics, 
tempUnknownTopics);
+
+            if (this.isManualInternalTopicConfig && !this.isInitializing) {

Review Comment:
   
   
   > Is this check actually correct here? `validateTopics()` above would return 
all topics that we need to create, so if `topicsNotReady` is empty here, all 
topic we did expect exist and we should not throw an exception. Should it be(?):
   > 
   > ```
   > if (!topicsNotReady.isEmpty() && isManualInternalTopicConfig) {
   >     throw new...
   > }
   > ```
   > 
   > (for this case, we would also move the check further below inside the 
already existing block that tried to creates internal topics L490):
   > 
   > ```
   > if (!topicsNotReady.isEmpty()) {
   >     if (isManualInternalTopicConfig) {
   >         throw new ...
   >     }
   > 
   >     final Set<NewTopic> newTopics = new HashSet<>();
   > ```
   
   My thinking was this, 
   
   if `(!topicsNotReady.isEmpty())` evaluates to true (the break condition for 
the while loop), we are saying **there are some topics to create**.. but, if I 
understand your point, that decision is not actually determined until validate 
finishes executing?
   
   Validate could return a result that says '**there's nothing to create', ** 
but the way this check stands, it would fail prematurely. If we decide to fail, 
we would need to be certain that there is a need to actually create topics to 
reach the desired state. I think capturing this decision in a variable could 
make this more readable in a future refactor.
   
    I will read over this and think on it, I think you may be right



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