KAFKA-15045: (KIP-924 pt. 17) State store computation fixed (#16194)

Fixed the calculation of the store name list based on the subtopology being accessed.

Also added a new test to make sure this new functionality works as intended.

Reviewers: Anna Sophie Blee-Goldman <ableegoldman@apache.org>

Author: apourchet

checkstyle/suppressions.xml

@@ -200,7 +200,7 @@
               files="StreamThread.java"/>
 
     <suppress checks="ClassDataAbstractionCoupling"
-              files="(KafkaStreams|KStreamImpl|KTableImpl).java"/>
+              files="(InternalTopologyBuilder|KafkaStreams|KStreamImpl|KTableImpl).java"/>
 
     <suppress checks="CyclomaticComplexity"
               files="(KafkaStreams|StreamsPartitionAssignor|StreamThread|TaskManager|PartitionGroup|SubscriptionWrapperSerde|AssignorConfiguration).java"/>

streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java

@@ -144,8 +144,12 @@ public InternalTopologyBuilder(final TopologyConfig topologyConfigs) {
 
     private String applicationId = null;
 
+    // keyed by subtopology id
     private Map<Integer, Set<String>> nodeGroups = null;
 
+    // keyed by subtopology id
+    private Map<Integer, Set<String>> subtopologyIdToStateStoreNames = null;
+
     // The name of the topology this builder belongs to, or null if this is not a NamedTopology
     private final String topologyName;
     // TODO KAFKA-13336: we can remove this reference once we make the Topology/NamedTopology class into an interface and implement it
@@ -937,14 +941,15 @@ private int putNodeGroupName(final String nodeName,
      * @return the full topology minus any global state
      */
     public synchronized ProcessorTopology buildTopology() {
-        final Set<String> nodeGroup = new HashSet<>();
+        final Set<String> allNodes = new HashSet<>();
         for (final Set<String> value : nodeGroups().values()) {
-            nodeGroup.addAll(value);
+            allNodes.addAll(value);
         }
-        nodeGroup.removeAll(globalNodeGroups());
+        allNodes.removeAll(globalNodeGroups());
 
         initializeSubscription();
-        return build(nodeGroup);
+        initializeSubtopologyIdToStateStoreNamesMap();
+        return build(allNodes);
     }
 
     /**
@@ -1500,6 +1505,34 @@ private boolean isGlobalSource(final String nodeName) {
         return false;
     }
 
+    public Set<String> stateStoreNamesForSubtopology(final int subtopologyId) {
+        return subtopologyIdToStateStoreNames.get(subtopologyId);
+    }
+
+    private void initializeSubtopologyIdToStateStoreNamesMap() {
+        final Map<Integer, Set<String>> storeNames = new HashMap<>();
+
+        for (final Map.Entry<Integer, Set<String>> nodeGroup : makeNodeGroups().entrySet()) {
+            final Set<String> subtopologyNodes = nodeGroup.getValue();
+            final boolean isNodeGroupOfGlobalStores = nodeGroupContainsGlobalSourceNode(subtopologyNodes);
+
+            if (!isNodeGroupOfGlobalStores) {
+                final int subtopologyId = nodeGroup.getKey();
+                final Set<String> subtopologyStoreNames = new HashSet<>();
+
+                for (final String nodeName : subtopologyNodes) {
+                    final AbstractNode node = nodeFactories.get(nodeName).describe();
+                    if (node instanceof Processor) {
+                        subtopologyStoreNames.addAll(((Processor) node).stores());
+                    }
+                }
+
+                storeNames.put(subtopologyId, subtopologyStoreNames);
+            }
+        }
+        subtopologyIdToStateStoreNames = storeNames;
+    }
+
     public TopologyDescription describe() {
         final TopologyDescription description = new TopologyDescription(topologyName);
 

streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamsPartitionAssignor.java

@@ -570,8 +570,7 @@ private ApplicationState buildApplicationState(final TopologyMetadata topologyMe
             Function.identity(),
             taskId -> {
                 final Set<String> stateStoreNames = topologyMetadata
-                    .stateStoreNameToSourceTopicsForTopology(taskId.topologyName())
-                    .keySet();
+                    .stateStoreNamesForSubtopology(taskId.topologyName(), taskId.subtopology());
                 final Set<TaskTopicPartition> topicPartitions = topicPartitionsForTask.get(taskId);
                 return new DefaultTaskInfo(
                     taskId,

streams/src/main/java/org/apache/kafka/streams/processor/internals/TopologyMetadata.java

@@ -521,6 +521,10 @@ public Map<String, List<String>> stateStoreNameToSourceTopicsForTopology(final S
         return lookupBuilderForNamedTopology(topologyName).stateStoreNameToFullSourceTopicNames();
     }
 
+    public Set<String> stateStoreNamesForSubtopology(final String topologyName, final int subtopologyId) {
+        return lookupBuilderForNamedTopology(topologyName).stateStoreNamesForSubtopology(subtopologyId);
+    }
+
     public Map<String, List<String>> stateStoreNameToSourceTopics() {
         final Map<String, List<String>> stateStoreNameToSourceTopics = new HashMap<>();
         applyToEachBuilder(b -> stateStoreNameToSourceTopics.putAll(b.stateStoreNameToFullSourceTopicNames()));

streams/src/test/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilderTest.java

@@ -71,6 +71,7 @@
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.nullValue;
 import static org.hamcrest.core.IsInstanceOf.instanceOf;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -568,6 +569,29 @@ public void testAddStateStore() {
         assertEquals(storeBuilder.name(), suppliers.get(0).name());
     }
 
+    @Test
+    public void testStateStoreNamesForSubtopology() {
+        builder.addStateStore(storeBuilder);
+        builder.setApplicationId("X");
+
+        builder.addSource(null, "source-1", null, null, null, "topic-1");
+        builder.addProcessor("processor-1", new MockApiProcessorSupplier<>(), "source-1");
+        builder.connectProcessorAndStateStores("processor-1", storeBuilder.name());
+
+        builder.addSource(null, "source-2", null, null, null, "topic-2");
+        builder.addProcessor("processor-2", new MockApiProcessorSupplier<>(), "source-2");
+
+        builder.buildTopology();
+        final Set<String> stateStoreNames = builder.stateStoreNamesForSubtopology(0);
+        assertThat(stateStoreNames, equalTo(mkSet(storeBuilder.name())));
+
+        final Set<String> emptyStoreNames = builder.stateStoreNamesForSubtopology(1);
+        assertThat(emptyStoreNames, equalTo(mkSet()));
+
+        final Set<String> stateStoreNamesUnknownSubtopology = builder.stateStoreNamesForSubtopology(13);
+        assertThat(stateStoreNamesUnknownSubtopology, nullValue());
+    }
+
     @Test
     public void shouldAllowAddingSameStoreBuilderMultipleTimes() {
         builder.setApplicationId("X");