mjsax commented on a change in pull request #8550:
URL: https://github.com/apache/kafka/pull/8550#discussion_r418784189



##########
File path: 
streams/src/test/java/org/apache/kafka/streams/kstream/internals/KStreamRepartitionTest.java
##########
@@ -104,6 +114,54 @@ public void shouldInvokePartitionerWhenSet() {
         verify(streamPartitionerMock);
     }
 
+    @Test
+    public void 
shouldThrowAnExceptionWhenNumberOfPartitionsOfRepartitionOperationsDoNotMatchWhenJoining()
 {
+        final String topicB = "topic-b";
+        final String outputTopic = "topic-output";
+        final String topicBRepartitionedName = "topic-b-scale-up";
+        final String inputTopicRepartitionedName = "input-topic-scale-up";
+        final int topicBNumberOfPartitions = 2;
+        final int inputTopicNumberOfPartitions = 4;
+        final StreamsBuilder builder = new StreamsBuilder();
+
+        final Repartitioned<Integer, String> inputTopicRepartitioned = 
Repartitioned
+                .<Integer, String>as(inputTopicRepartitionedName)
+                .withNumberOfPartitions(inputTopicNumberOfPartitions);
+
+        final Repartitioned<Integer, String> topicBRepartitioned = 
Repartitioned
+                .<Integer, String>as(topicBRepartitionedName)
+                .withNumberOfPartitions(topicBNumberOfPartitions);
+
+        final KStream<Integer, String> topicBStream = builder
+                .stream(topicB, Consumed.with(Serdes.Integer(), 
Serdes.String()))
+                .repartition(topicBRepartitioned);
+
+        builder.stream(inputTopic, Consumed.with(Serdes.Integer(), 
Serdes.String()))
+                .repartition(inputTopicRepartitioned)
+                .join(topicBStream, (value1, value2) -> value2, 
JoinWindows.of(Duration.ofSeconds(10)))
+                .to(outputTopic);
+
+        final Map<String, Integer> repartitionTopicsWithNumOfPartitions = 
Utils.mkMap(
+                Utils.mkEntry(toRepartitionTopicName(topicBRepartitionedName), 
topicBNumberOfPartitions),
+                
Utils.mkEntry(toRepartitionTopicName(inputTopicRepartitionedName), 
inputTopicNumberOfPartitions)
+        );
+
+        try {
+            builder.build(props);
+            Assert.fail();
+        } catch (final TopologyException t) {

Review comment:
       It's better to use:
   ```
   final TopologyException expected = assertThrows(
     TopologyException.class,
     () -> builder.build(props)
   );
   // put assertions here
   ```

##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java
##########
@@ -633,6 +634,43 @@ public final void copartitionSources(final 
Collection<String> sourceNodes) {
         copartitionSourceGroups.add(Collections.unmodifiableSet(new 
HashSet<>(sourceNodes)));
     }
 
+    public void validateCopartition() {
+        final List<Set<String>> copartitionGroups =

Review comment:
       If I understand this code correct, `copartitionGroups` take the list of 
co-partitioned nodes (ie, processor names -> `copartitionSourceGroups`) and 
replaces each processor name (each processor should be a source-processor?) 
with the corresponding source topic name?
   
   If yes, a comment might be helpful. Also, name rename `copartitionGroups` -> 
`allCopartitionedSourceTopics` ?

##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java
##########
@@ -633,6 +634,43 @@ public final void copartitionSources(final 
Collection<String> sourceNodes) {
         copartitionSourceGroups.add(Collections.unmodifiableSet(new 
HashSet<>(sourceNodes)));
     }
 
+    public void validateCopartition() {
+        final List<Set<String>> copartitionGroups =
+                copartitionSourceGroups
+                        .stream()
+                        .map(sourceGroup -> sourceGroup
+                                .stream()
+                                .flatMap(node -> 
nodeToSourceTopics.get(node).stream())

Review comment:
       rename `node` -> `sourceNodeName` ?

##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java
##########
@@ -633,6 +634,43 @@ public final void copartitionSources(final 
Collection<String> sourceNodes) {
         copartitionSourceGroups.add(Collections.unmodifiableSet(new 
HashSet<>(sourceNodes)));
     }
 
+    public void validateCopartition() {
+        final List<Set<String>> copartitionGroups =
+                copartitionSourceGroups
+                        .stream()
+                        .map(sourceGroup -> sourceGroup
+                                .stream()
+                                .flatMap(node -> 
nodeToSourceTopics.get(node).stream())
+                                .collect(Collectors.toSet())
+                        ).collect(Collectors.toList());
+        for (final Set<String> copartition : copartitionGroups) {
+            final Map<String, Integer> topicPartNum = new HashMap<>();
+            copartition.forEach(topic -> {
+                final InternalTopicProperties prop = 
internalTopicNamesWithProperties.get(topic);
+                if (prop != null && prop.getNumberOfPartitions().isPresent()) {
+                    topicPartNum.put(topic, 
prop.getNumberOfPartitions().get());
+                }
+            });
+            internalTopicNamesWithProperties.forEach((topic, prop) -> {
+                if (copartition.contains(topic) && 
prop.getNumberOfPartitions().isPresent()) {
+                    topicPartNum.put(topic, 
prop.getNumberOfPartitions().get());
+                }
+            });
+            if (copartition.equals(topicPartNum.keySet())) {
+                final Collection<Integer> partNums = topicPartNum.values();
+                final Integer first = partNums.iterator().next();

Review comment:
       How can we be sure that `partNums` is not empty? If empty, `next()` 
would throw.

##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java
##########
@@ -633,6 +634,43 @@ public final void copartitionSources(final 
Collection<String> sourceNodes) {
         copartitionSourceGroups.add(Collections.unmodifiableSet(new 
HashSet<>(sourceNodes)));
     }
 
+    public void validateCopartition() {
+        final List<Set<String>> copartitionGroups =
+                copartitionSourceGroups
+                        .stream()
+                        .map(sourceGroup -> sourceGroup
+                                .stream()
+                                .flatMap(node -> 
nodeToSourceTopics.get(node).stream())
+                                .collect(Collectors.toSet())
+                        ).collect(Collectors.toList());
+        for (final Set<String> copartition : copartitionGroups) {
+            final Map<String, Integer> topicPartNum = new HashMap<>();

Review comment:
       What is `topicPartNum`? Please avoid abbreviation; make the code hard to 
read?
   
   Should this be `numberOfPartitionsPerTopic` ?

##########
File path: 
streams/src/main/java/org/apache/kafka/streams/kstream/internals/InternalStreamsBuilder.java
##########
@@ -312,6 +312,7 @@ public void buildAndOptimizeTopology(final Properties 
props) {
                 graphNodePriorityQueue.offer(graphNode);
             }
         }
+        internalTopologyBuilder.validateCoPartition();

Review comment:
       I don't think so. Because the later verification that covers the case if 
the user specified all partitions, is the same code that verify co-partitioning 
depending on the input topic partition numbers. And we still need that check 
anyway.

##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java
##########
@@ -633,6 +634,43 @@ public final void copartitionSources(final 
Collection<String> sourceNodes) {
         copartitionSourceGroups.add(Collections.unmodifiableSet(new 
HashSet<>(sourceNodes)));
     }
 
+    public void validateCopartition() {
+        final List<Set<String>> copartitionGroups =
+                copartitionSourceGroups
+                        .stream()
+                        .map(sourceGroup -> sourceGroup
+                                .stream()
+                                .flatMap(node -> 
nodeToSourceTopics.get(node).stream())
+                                .collect(Collectors.toSet())
+                        ).collect(Collectors.toList());
+        for (final Set<String> copartition : copartitionGroups) {
+            final Map<String, Integer> topicPartNum = new HashMap<>();
+            copartition.forEach(topic -> {
+                final InternalTopicProperties prop = 
internalTopicNamesWithProperties.get(topic);
+                if (prop != null && prop.getNumberOfPartitions().isPresent()) {
+                    topicPartNum.put(topic, 
prop.getNumberOfPartitions().get());
+                }
+            });
+            internalTopicNamesWithProperties.forEach((topic, prop) -> {
+                if (copartition.contains(topic) && 
prop.getNumberOfPartitions().isPresent()) {
+                    topicPartNum.put(topic, 
prop.getNumberOfPartitions().get());
+                }
+            });
+            if (copartition.equals(topicPartNum.keySet())) {
+                final Collection<Integer> partNums = topicPartNum.values();
+                final Integer first = partNums.iterator().next();
+                for (final Integer partNum : partNums) {
+                    if (partNum.equals(first)) {

Review comment:
       Should this be `!partNum.equals(first)` ?

##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java
##########
@@ -633,6 +634,43 @@ public final void copartitionSources(final 
Collection<String> sourceNodes) {
         copartitionSourceGroups.add(Collections.unmodifiableSet(new 
HashSet<>(sourceNodes)));
     }
 
+    public void validateCopartition() {
+        final List<Set<String>> copartitionGroups =
+                copartitionSourceGroups
+                        .stream()
+                        .map(sourceGroup -> sourceGroup
+                                .stream()
+                                .flatMap(node -> 
nodeToSourceTopics.get(node).stream())
+                                .collect(Collectors.toSet())
+                        ).collect(Collectors.toList());
+        for (final Set<String> copartition : copartitionGroups) {
+            final Map<String, Integer> topicPartNum = new HashMap<>();
+            copartition.forEach(topic -> {
+                final InternalTopicProperties prop = 
internalTopicNamesWithProperties.get(topic);
+                if (prop != null && prop.getNumberOfPartitions().isPresent()) {
+                    topicPartNum.put(topic, 
prop.getNumberOfPartitions().get());
+                }
+            });
+            internalTopicNamesWithProperties.forEach((topic, prop) -> {
+                if (copartition.contains(topic) && 
prop.getNumberOfPartitions().isPresent()) {
+                    topicPartNum.put(topic, 
prop.getNumberOfPartitions().get());

Review comment:
       Why do we add all the partition numbers for all internal topics here? 
Seems redundant to the step from above?




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