brandboat commented on code in PR #22531:
URL: https://github.com/apache/kafka/pull/22531#discussion_r3488119863


##########
raft/src/test/java/org/apache/kafka/raft/KafkaRaftClientReconfigTest.java:
##########
@@ -364,6 +364,170 @@ public void testAddVoter() throws Exception {
         context.assertSentAddVoterResponse(Errors.NONE);
     }
 
+    @Test
+    public void testAddVoterDerivesDirectoryIdAndEndpoints() throws Exception {
+        ReplicaKey local = replicaKey(randomReplicaId(), true);
+        ReplicaKey follower = replicaKey(local.id() + 1, true);
+        VoterSet voters = VoterSetTest.voterSet(Stream.of(local, follower));
+
+        RaftClientTestContext context = new 
RaftClientTestContext.Builder(local.id(), local.directoryId().get())
+            .withRaftProtocol(RaftProtocol.KIP_1141_PROTOCOL)
+            .withBootstrapSnapshot(Optional.of(voters))
+            .withUnknownLeader(3)
+            .build();
+
+        context.unattachedToLeader();
+        int epoch = context.currentEpoch();
+
+        ReplicaKey newVoter = replicaKey(local.id() + 2, true);
+        InetSocketAddress newAddress = InetSocketAddress.createUnresolved(
+            "localhost",
+            9990 + newVoter.id()
+        );
+        Endpoints newListeners = Endpoints.fromInetSocketAddresses(
+            Map.of(context.channel.listenerName(), newAddress)
+        );
+        context.client.setNodeEndpointProvider(nodeId ->
+            nodeId == newVoter.id() ? newListeners : Endpoints.empty()
+        );
+
+        prepareLeaderToReceiveAddVoter(context, epoch, local, follower, 
newVoter);
+
+        context.deliverRequest(
+            context.addVoterRequest(
+                Integer.MAX_VALUE,
+                ReplicaKey.of(newVoter.id(), Uuid.ZERO_UUID),
+                Endpoints.empty()
+            )
+        );
+
+        completeApiVersionsForAddVoter(context, newVoter, newAddress);
+
+        // Handle the API_VERSIONS response
+        context.client.poll();
+        // Append new VotersRecord to log
+        context.client.poll();
+
+        commitNewVoterSetForAddVoter(context, local, follower, newVoter, 
epoch);
+
+        // Expect reply for AddVoter request
+        context.pollUntilResponse();
+        context.assertSentAddVoterResponse(Errors.NONE);
+    }
+
+    @Test
+    public void testAddVoterFailsToDeriveDefaultListenerEndpoint() throws 
Exception {
+        ReplicaKey local = replicaKey(randomReplicaId(), true);
+        ReplicaKey follower = replicaKey(local.id() + 1, true);
+        VoterSet voters = VoterSetTest.voterSet(Stream.of(local, follower));
+
+        RaftClientTestContext context = new 
RaftClientTestContext.Builder(local.id(), local.directoryId().get())
+            .withRaftProtocol(RaftProtocol.KIP_1141_PROTOCOL)
+            .withBootstrapSnapshot(Optional.of(voters))
+            .withUnknownLeader(3)
+            .build();
+
+        context.unattachedToLeader();
+        int epoch = context.currentEpoch();
+        ReplicaKey newVoter = replicaKey(local.id() + 2, true);
+
+        prepareLeaderToReceiveAddVoter(context, epoch, local, follower, 
newVoter);
+
+        context.deliverRequest(
+            context.addVoterRequest(
+                Integer.MAX_VALUE,
+                ReplicaKey.of(newVoter.id(), Uuid.ZERO_UUID),
+                Endpoints.empty()
+            )
+        );
+
+        context.pollUntilResponse();
+        context.assertSentAddVoterResponse(Errors.INVALID_REQUEST);
+    }
+
+    @Test
+    public void testAddVoterDoesNotReplaceExplicitDirectoryId() throws 
Exception {
+        ReplicaKey local = replicaKey(randomReplicaId(), true);
+        ReplicaKey follower = replicaKey(local.id() + 1, true);
+        VoterSet voters = VoterSetTest.voterSet(Stream.of(local, follower));
+
+        RaftClientTestContext context = new 
RaftClientTestContext.Builder(local.id(), local.directoryId().get())
+            .withRaftProtocol(RaftProtocol.KIP_1141_PROTOCOL)
+            .withBootstrapSnapshot(Optional.of(voters))
+            .withUnknownLeader(3)
+            .build();
+
+        context.unattachedToLeader();
+        int epoch = context.currentEpoch();
+        ReplicaKey observer = replicaKey(local.id() + 2, true);
+        ReplicaKey requestedVoter = replicaKey(observer.id(), true);
+        InetSocketAddress newAddress = InetSocketAddress.createUnresolved(
+            "localhost",
+            9990 + observer.id()
+        );
+        Endpoints newListeners = Endpoints.fromInetSocketAddresses(
+            Map.of(context.channel.listenerName(), newAddress)
+        );
+
+        prepareLeaderToReceiveAddVoter(context, epoch, local, follower, 
observer);
+        context.deliverRequest(
+            context.addVoterRequest(Integer.MAX_VALUE, requestedVoter, 
newListeners)
+        );
+        completeApiVersionsForAddVoter(context, requestedVoter, newAddress);
+
+        context.pollUntilResponse();
+        context.assertSentAddVoterResponse(Errors.REQUEST_TIMED_OUT);

Review Comment:
   > We should return INVALID_REQUEST before even entering AddVoterHandler. We 
should be returning a similar error to the test below.
   
   I think we should keep the behavior consistent between v1 and v2. If the 
user specifies an incorrect directory UUID, we shouldn't perform directory ID 
validation in KafkaRaftClient in v2. Instead, we should forward the request to 
AddVoterHandler, just like we did in v1.



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