artemlivshits commented on code in PR #13391:
URL: https://github.com/apache/kafka/pull/13391#discussion_r1148060963


##########
core/src/main/scala/kafka/server/AddPartitionsToTxnManager.scala:
##########
@@ -0,0 +1,173 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka.server
+
+import kafka.common.{InterBrokerSendThread, RequestAndCompletionHandler}
+import org.apache.kafka.clients.{ClientResponse, NetworkClient, 
RequestCompletionHandler}
+import org.apache.kafka.common.{InvalidRecordException, Node, TopicPartition}
+import 
org.apache.kafka.common.message.AddPartitionsToTxnRequestData.{AddPartitionsToTxnTransaction,
 AddPartitionsToTxnTransactionCollection}
+import org.apache.kafka.common.protocol.Errors
+import org.apache.kafka.common.requests.{AddPartitionsToTxnRequest, 
AddPartitionsToTxnResponse}
+import org.apache.kafka.common.utils.Time
+
+import java.util.Collections
+import scala.collection.mutable
+
+object AddPartitionsToTxnManager {
+  type AppendCallback = Map[TopicPartition, Errors] => Unit
+}
+
+
+class TransactionDataAndCallbacks(val transactionData: 
AddPartitionsToTxnTransactionCollection,
+                                  val callbacks: mutable.Map[String, 
AddPartitionsToTxnManager.AppendCallback])
+
+
+class AddPartitionsToTxnManager(config: KafkaConfig, client: NetworkClient, 
time: Time) 
+  extends InterBrokerSendThread("AddPartitionsToTxnSenderThread-" + 
config.brokerId, client, config.requestTimeoutMs, time) {
+  
+  private val inflightNodes = mutable.HashSet[Node]()
+  private val nodesToTransactions = mutable.Map[Node, 
TransactionDataAndCallbacks]()
+  
+  def addTxnData(node: Node, transactionData: AddPartitionsToTxnTransaction, 
callback: AddPartitionsToTxnManager.AppendCallback): Unit = {
+    // Check if we have already (either node or individual transaction). 
+    val currentNodeAndTransactionDataOpt = nodesToTransactions.get(node)
+    currentNodeAndTransactionDataOpt match {
+      case None =>
+        nodesToTransactions.put(node,
+          new TransactionDataAndCallbacks(new 
AddPartitionsToTxnTransactionCollection(Collections.singletonList(transactionData).iterator()),
+            mutable.Map(transactionData.transactionalId() -> callback)))
+      case Some(currentNodeAndTransactionData) =>
+        // Check if we already have txn ID -- this should only happen in epoch 
bump case. If so, we should return error for old entry and remove from queue.
+        val currentTransactionData = 
currentNodeAndTransactionData.transactionData.find(transactionData.transactionalId)
+        if (currentTransactionData != null) {
+          if (currentTransactionData.producerEpoch() < 
transactionData.producerEpoch()) {
+            val topicPartitionsToError = mutable.Map[TopicPartition, Errors]()
+            currentTransactionData.topics().forEach { topic => 
+              topic.partitions().forEach { partition =>
+                topicPartitionsToError.put(new TopicPartition(topic.name(), 
partition), Errors.INVALID_PRODUCER_EPOCH)
+              }
+            }
+            val oldCallback = 
currentNodeAndTransactionData.callbacks(transactionData.transactionalId())
+            
currentNodeAndTransactionData.transactionData.remove(transactionData)
+            oldCallback(topicPartitionsToError.toMap)
+          } else {
+            // We should never see a request on the same epoch since we 
haven't finished handling the one in queue
+            throw new InvalidRecordException("Received a second request from 
the same connection without finishing the first.")
+          }
+        }
+        currentNodeAndTransactionData.transactionData.add(transactionData)
+        
currentNodeAndTransactionData.callbacks.put(transactionData.transactionalId(), 
callback)
+    }
+    wakeup()
+  }
+
+  private class AddPartitionsToTxnHandler(node: Node, 
transactionDataAndCallbacks: TransactionDataAndCallbacks) extends 
RequestCompletionHandler {
+    override def onComplete(response: ClientResponse): Unit = {

Review Comment:
   We should measure the time it took to process the request to TC and report 
it (either as "remote time" that we already have or as a new metric), otherwise 
it'll just roll into "local time" (time spent by this broker to handle the 
request).



##########
core/src/main/scala/kafka/server/AddPartitionsToTxnManager.scala:
##########
@@ -0,0 +1,173 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka.server
+
+import kafka.common.{InterBrokerSendThread, RequestAndCompletionHandler}
+import org.apache.kafka.clients.{ClientResponse, NetworkClient, 
RequestCompletionHandler}
+import org.apache.kafka.common.{InvalidRecordException, Node, TopicPartition}
+import 
org.apache.kafka.common.message.AddPartitionsToTxnRequestData.{AddPartitionsToTxnTransaction,
 AddPartitionsToTxnTransactionCollection}
+import org.apache.kafka.common.protocol.Errors
+import org.apache.kafka.common.requests.{AddPartitionsToTxnRequest, 
AddPartitionsToTxnResponse}
+import org.apache.kafka.common.utils.Time
+
+import java.util.Collections
+import scala.collection.mutable
+
+object AddPartitionsToTxnManager {
+  type AppendCallback = Map[TopicPartition, Errors] => Unit
+}
+
+
+class TransactionDataAndCallbacks(val transactionData: 
AddPartitionsToTxnTransactionCollection,
+                                  val callbacks: mutable.Map[String, 
AddPartitionsToTxnManager.AppendCallback])
+
+
+class AddPartitionsToTxnManager(config: KafkaConfig, client: NetworkClient, 
time: Time) 
+  extends InterBrokerSendThread("AddPartitionsToTxnSenderThread-" + 
config.brokerId, client, config.requestTimeoutMs, time) {
+  
+  private val inflightNodes = mutable.HashSet[Node]()
+  private val nodesToTransactions = mutable.Map[Node, 
TransactionDataAndCallbacks]()
+  
+  def addTxnData(node: Node, transactionData: AddPartitionsToTxnTransaction, 
callback: AddPartitionsToTxnManager.AppendCallback): Unit = {
+    // Check if we have already (either node or individual transaction). 
+    val currentNodeAndTransactionDataOpt = nodesToTransactions.get(node)
+    currentNodeAndTransactionDataOpt match {
+      case None =>
+        nodesToTransactions.put(node,
+          new TransactionDataAndCallbacks(new 
AddPartitionsToTxnTransactionCollection(Collections.singletonList(transactionData).iterator()),
+            mutable.Map(transactionData.transactionalId() -> callback)))
+      case Some(currentNodeAndTransactionData) =>
+        // Check if we already have txn ID -- this should only happen in epoch 
bump case. If so, we should return error for old entry and remove from queue.
+        val currentTransactionData = 
currentNodeAndTransactionData.transactionData.find(transactionData.transactionalId)
+        if (currentTransactionData != null) {
+          if (currentTransactionData.producerEpoch() < 
transactionData.producerEpoch()) {
+            val topicPartitionsToError = mutable.Map[TopicPartition, Errors]()
+            currentTransactionData.topics().forEach { topic => 
+              topic.partitions().forEach { partition =>
+                topicPartitionsToError.put(new TopicPartition(topic.name(), 
partition), Errors.INVALID_PRODUCER_EPOCH)
+              }
+            }
+            val oldCallback = 
currentNodeAndTransactionData.callbacks(transactionData.transactionalId())
+            
currentNodeAndTransactionData.transactionData.remove(transactionData)
+            oldCallback(topicPartitionsToError.toMap)
+          } else {
+            // We should never see a request on the same epoch since we 
haven't finished handling the one in queue

Review Comment:
   If a request hits a timeout the new request will come in the new connection, 
so the fact the old connection is muted wouldn't prevent the new request to 
come.  The timeout processing on the client is just a timer, once it expires, 
it'll kill old connection, create a new one and re-send the batch.  We won't 
bump the epoch on retry -- it'll override duplicate checking logic, so we'd 
have duplicates if we did, so the exact same batch (same epoch, same sequence) 
will come again on the new connection.



##########
core/src/main/scala/kafka/server/AddPartitionsToTxnManager.scala:
##########
@@ -0,0 +1,173 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka.server
+
+import kafka.common.{InterBrokerSendThread, RequestAndCompletionHandler}
+import org.apache.kafka.clients.{ClientResponse, NetworkClient, 
RequestCompletionHandler}
+import org.apache.kafka.common.{InvalidRecordException, Node, TopicPartition}
+import 
org.apache.kafka.common.message.AddPartitionsToTxnRequestData.{AddPartitionsToTxnTransaction,
 AddPartitionsToTxnTransactionCollection}
+import org.apache.kafka.common.protocol.Errors
+import org.apache.kafka.common.requests.{AddPartitionsToTxnRequest, 
AddPartitionsToTxnResponse}
+import org.apache.kafka.common.utils.Time
+
+import java.util.Collections
+import scala.collection.mutable
+
+object AddPartitionsToTxnManager {
+  type AppendCallback = Map[TopicPartition, Errors] => Unit
+}
+
+
+class TransactionDataAndCallbacks(val transactionData: 
AddPartitionsToTxnTransactionCollection,
+                                  val callbacks: mutable.Map[String, 
AddPartitionsToTxnManager.AppendCallback])
+
+
+class AddPartitionsToTxnManager(config: KafkaConfig, client: NetworkClient, 
time: Time) 
+  extends InterBrokerSendThread("AddPartitionsToTxnSenderThread-" + 
config.brokerId, client, config.requestTimeoutMs, time) {
+  
+  private val inflightNodes = mutable.HashSet[Node]()
+  private val nodesToTransactions = mutable.Map[Node, 
TransactionDataAndCallbacks]()
+  
+  def addTxnData(node: Node, transactionData: AddPartitionsToTxnTransaction, 
callback: AddPartitionsToTxnManager.AppendCallback): Unit = {
+    // Check if we have already (either node or individual transaction). 
+    val currentNodeAndTransactionDataOpt = nodesToTransactions.get(node)
+    currentNodeAndTransactionDataOpt match {
+      case None =>
+        nodesToTransactions.put(node,
+          new TransactionDataAndCallbacks(new 
AddPartitionsToTxnTransactionCollection(Collections.singletonList(transactionData).iterator()),
+            mutable.Map(transactionData.transactionalId() -> callback)))
+      case Some(currentNodeAndTransactionData) =>
+        // Check if we already have txn ID -- this should only happen in epoch 
bump case. If so, we should return error for old entry and remove from queue.
+        val currentTransactionData = 
currentNodeAndTransactionData.transactionData.find(transactionData.transactionalId)
+        if (currentTransactionData != null) {
+          if (currentTransactionData.producerEpoch() < 
transactionData.producerEpoch()) {

Review Comment:
   Oh, I see, we have only one request for a trasnactional.id, so we need to 
complete previous one in order to replace.
   
   >The only time we can receive two requests from the same txn id is when the 
producer restarts and the epoch is bumped
   
   See my other comments about retries.
   



##########
core/src/main/scala/kafka/server/AddPartitionsToTxnManager.scala:
##########
@@ -0,0 +1,173 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka.server
+
+import kafka.common.{InterBrokerSendThread, RequestAndCompletionHandler}
+import org.apache.kafka.clients.{ClientResponse, NetworkClient, 
RequestCompletionHandler}
+import org.apache.kafka.common.{InvalidRecordException, Node, TopicPartition}
+import 
org.apache.kafka.common.message.AddPartitionsToTxnRequestData.{AddPartitionsToTxnTransaction,
 AddPartitionsToTxnTransactionCollection}
+import org.apache.kafka.common.protocol.Errors
+import org.apache.kafka.common.requests.{AddPartitionsToTxnRequest, 
AddPartitionsToTxnResponse}
+import org.apache.kafka.common.utils.Time
+
+import java.util.Collections
+import scala.collection.mutable
+
+object AddPartitionsToTxnManager {
+  type AppendCallback = Map[TopicPartition, Errors] => Unit
+}
+
+
+class TransactionDataAndCallbacks(val transactionData: 
AddPartitionsToTxnTransactionCollection,
+                                  val callbacks: mutable.Map[String, 
AddPartitionsToTxnManager.AppendCallback])
+
+
+class AddPartitionsToTxnManager(config: KafkaConfig, client: NetworkClient, 
time: Time) 
+  extends InterBrokerSendThread("AddPartitionsToTxnSenderThread-" + 
config.brokerId, client, config.requestTimeoutMs, time) {
+  
+  private val inflightNodes = mutable.HashSet[Node]()
+  private val nodesToTransactions = mutable.Map[Node, 
TransactionDataAndCallbacks]()
+  
+  def addTxnData(node: Node, transactionData: AddPartitionsToTxnTransaction, 
callback: AddPartitionsToTxnManager.AppendCallback): Unit = {
+    // Check if we have already (either node or individual transaction). 
+    val currentNodeAndTransactionDataOpt = nodesToTransactions.get(node)
+    currentNodeAndTransactionDataOpt match {
+      case None =>
+        nodesToTransactions.put(node,
+          new TransactionDataAndCallbacks(new 
AddPartitionsToTxnTransactionCollection(Collections.singletonList(transactionData).iterator()),
+            mutable.Map(transactionData.transactionalId() -> callback)))
+      case Some(currentNodeAndTransactionData) =>
+        // Check if we already have txn ID -- this should only happen in epoch 
bump case. If so, we should return error for old entry and remove from queue.
+        val currentTransactionData = 
currentNodeAndTransactionData.transactionData.find(transactionData.transactionalId)
+        if (currentTransactionData != null) {
+          if (currentTransactionData.producerEpoch() < 
transactionData.producerEpoch()) {
+            val topicPartitionsToError = mutable.Map[TopicPartition, Errors]()
+            currentTransactionData.topics().forEach { topic => 
+              topic.partitions().forEach { partition =>
+                topicPartitionsToError.put(new TopicPartition(topic.name(), 
partition), Errors.INVALID_PRODUCER_EPOCH)
+              }
+            }
+            val oldCallback = 
currentNodeAndTransactionData.callbacks(transactionData.transactionalId())
+            
currentNodeAndTransactionData.transactionData.remove(transactionData)
+            oldCallback(topicPartitionsToError.toMap)
+          } else {
+            // We should never see a request on the same epoch since we 
haven't finished handling the one in queue
+            throw new InvalidRecordException("Received a second request from 
the same connection without finishing the first.")
+          }
+        }
+        currentNodeAndTransactionData.transactionData.add(transactionData)
+        
currentNodeAndTransactionData.callbacks.put(transactionData.transactionalId(), 
callback)
+    }
+    wakeup()
+  }
+
+  private class AddPartitionsToTxnHandler(node: Node, 
transactionDataAndCallbacks: TransactionDataAndCallbacks) extends 
RequestCompletionHandler {
+    override def onComplete(response: ClientResponse): Unit = {
+      inflightNodes.synchronized(inflightNodes.remove(node))

Review Comment:
   I'd expect the synchronization would be added as part of making the class 
properly multithreaded.



##########
core/src/main/scala/kafka/network/RequestChannel.scala:
##########
@@ -483,14 +493,10 @@ class RequestChannel(val queueSize: Int,
 
   def sendShutdownRequest(): Unit = requestQueue.put(ShutdownRequest)
 
-  // TODO: this is the most straightforward implementation, we may want to 
address fairness:
-  // The callback function is invoked as part of processing a request, so it 
already "stood in line"
-  // when the original request got accepted, so it may be unfair to make put 
to the end of the line.
-  // A simple solution would be to put it to the head of the line, but then 
multiple callbacks would
-  // be in LIFO order, which is weird.
-  // We may want to use a PriorityBlockingQueue or just have 2 queues and 
write customer wait / notify
-  // synchronization.
-  def sendCallbackRequest(request: CallbackRequest): Unit = 
requestQueue.put(request)
+  def sendCallbackRequest(request: CallbackRequest): Unit = {
+    callbackQueue.put(request)

Review Comment:
   We could try to re-purpose the action queue for this, but it currently has 
different semantics -- the error processing is different, for example (it's 
executed in the finally clause).  What we want here is the semantics that we'd 
get if we just blocked the thread while we're contacting TC, but without 
blocking the thread.  Same error handling, same context, same metrics, etc.
   
   The basic implementation of the desired semantics is just a queue, but we 
could also preserve request context (see TODOs in KafkaRequestHandler.scala) so 
that this functionality that would work for any requests that need to do 
non-blocking async calls.
   



##########
core/src/main/scala/kafka/network/RequestChannel.scala:
##########
@@ -481,6 +493,11 @@ class RequestChannel(val queueSize: Int,
 
   def sendShutdownRequest(): Unit = requestQueue.put(ShutdownRequest)
 
+  def sendCallbackRequest(request: CallbackRequest): Unit = {
+    callbackQueue.put(request)
+    requestQueue.put(RequestChannel.WakeupRequest)

Review Comment:
   I guess, if the request queue is full then it means that the request threads 
are all overloaded, so if we block the inter-broker channel thread it probably 
wouldn't matter much as the broker is already in pain.  But on the other hand, 
it's kind of strange to not implement technically more correct behavior because 
we've got some spurious warnings.



##########
core/src/main/scala/kafka/server/AddPartitionsToTxnManager.scala:
##########
@@ -0,0 +1,173 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka.server
+
+import kafka.common.{InterBrokerSendThread, RequestAndCompletionHandler}
+import org.apache.kafka.clients.{ClientResponse, NetworkClient, 
RequestCompletionHandler}
+import org.apache.kafka.common.{InvalidRecordException, Node, TopicPartition}
+import 
org.apache.kafka.common.message.AddPartitionsToTxnRequestData.{AddPartitionsToTxnTransaction,
 AddPartitionsToTxnTransactionCollection}
+import org.apache.kafka.common.protocol.Errors
+import org.apache.kafka.common.requests.{AddPartitionsToTxnRequest, 
AddPartitionsToTxnResponse}
+import org.apache.kafka.common.utils.Time
+
+import java.util.Collections
+import scala.collection.mutable
+
+object AddPartitionsToTxnManager {
+  type AppendCallback = Map[TopicPartition, Errors] => Unit
+}
+
+
+class TransactionDataAndCallbacks(val transactionData: 
AddPartitionsToTxnTransactionCollection,
+                                  val callbacks: mutable.Map[String, 
AddPartitionsToTxnManager.AppendCallback])
+
+
+class AddPartitionsToTxnManager(config: KafkaConfig, client: NetworkClient, 
time: Time) 
+  extends InterBrokerSendThread("AddPartitionsToTxnSenderThread-" + 
config.brokerId, client, config.requestTimeoutMs, time) {
+  
+  private val inflightNodes = mutable.HashSet[Node]()
+  private val nodesToTransactions = mutable.Map[Node, 
TransactionDataAndCallbacks]()
+  
+  def addTxnData(node: Node, transactionData: AddPartitionsToTxnTransaction, 
callback: AddPartitionsToTxnManager.AppendCallback): Unit = {
+    // Check if we have already (either node or individual transaction). 
+    val currentNodeAndTransactionDataOpt = nodesToTransactions.get(node)
+    currentNodeAndTransactionDataOpt match {
+      case None =>
+        nodesToTransactions.put(node,
+          new TransactionDataAndCallbacks(new 
AddPartitionsToTxnTransactionCollection(Collections.singletonList(transactionData).iterator()),
+            mutable.Map(transactionData.transactionalId() -> callback)))
+      case Some(currentNodeAndTransactionData) =>
+        // Check if we already have txn ID -- this should only happen in epoch 
bump case. If so, we should return error for old entry and remove from queue.
+        val currentTransactionData = 
currentNodeAndTransactionData.transactionData.find(transactionData.transactionalId)
+        if (currentTransactionData != null) {
+          if (currentTransactionData.producerEpoch() < 
transactionData.producerEpoch()) {
+            val topicPartitionsToError = mutable.Map[TopicPartition, Errors]()
+            currentTransactionData.topics().forEach { topic => 
+              topic.partitions().forEach { partition =>
+                topicPartitionsToError.put(new TopicPartition(topic.name(), 
partition), Errors.INVALID_PRODUCER_EPOCH)
+              }
+            }
+            val oldCallback = 
currentNodeAndTransactionData.callbacks(transactionData.transactionalId())
+            
currentNodeAndTransactionData.transactionData.remove(transactionData)
+            oldCallback(topicPartitionsToError.toMap)
+          } else {
+            // We should never see a request on the same epoch since we 
haven't finished handling the one in queue
+            throw new InvalidRecordException("Received a second request from 
the same connection without finishing the first.")
+          }
+        }
+        currentNodeAndTransactionData.transactionData.add(transactionData)
+        
currentNodeAndTransactionData.callbacks.put(transactionData.transactionalId(), 
callback)
+    }
+    wakeup()
+  }
+
+  private class AddPartitionsToTxnHandler(node: Node, 
transactionDataAndCallbacks: TransactionDataAndCallbacks) extends 
RequestCompletionHandler {
+    override def onComplete(response: ClientResponse): Unit = {
+      inflightNodes.synchronized(inflightNodes.remove(node))
+      if (response.authenticationException() != null) {
+        error(s"AddPartitionsToTxnRequest failed for broker ${config.brokerId} 
with an " +
+          "authentication exception.", response.authenticationException)
+        transactionDataAndCallbacks.callbacks.foreach { case (txnId, callback) 
=>
+          callback(buildErrorMap(txnId, 
transactionDataAndCallbacks.transactionData, 
Errors.forException(response.authenticationException()).code()))
+        }
+      } else if (response.versionMismatch != null) {
+        // We may see unsupported version exception if we try to send a verify 
only request to a broker that can't handle it. 
+        // In this case, skip verification.
+        error(s"AddPartitionsToTxnRequest failed for broker ${config.brokerId} 
with invalid version exception. This suggests verification is not supported." +
+              s"Continuing handling the produce request.")
+        transactionDataAndCallbacks.callbacks.values.foreach(_(Map.empty))
+      } else {
+        val addPartitionsToTxnResponseData = 
response.responseBody.asInstanceOf[AddPartitionsToTxnResponse].data
+        if (addPartitionsToTxnResponseData.errorCode != 0) {
+          error(s"AddPartitionsToTxnRequest for broker ${config.brokerId}  
returned with error 
${Errors.forCode(addPartitionsToTxnResponseData.errorCode)}.")
+          // TODO: send error back correctly -- we need to verify all possible 
errors can be handled by the client.
+          // errors -- versionmismatch --> handled above
+          //        -- clusterauth --> should handle differently
+          transactionDataAndCallbacks.callbacks.foreach { case (txnId, 
callback) =>
+            callback(buildErrorMap(txnId, 
transactionDataAndCallbacks.transactionData, 
addPartitionsToTxnResponseData.errorCode()))
+          }
+        } else {
+          val unverified = mutable.Map[TopicPartition, Errors]()
+          addPartitionsToTxnResponseData.resultsByTransaction().forEach { 
transactionResult =>
+            transactionResult.topicResults().forEach { topicResult =>
+              topicResult.resultsByPartition().forEach { partitionResult =>
+                val tp = new TopicPartition(topicResult.name(), 
partitionResult.partitionIndex())
+                if (partitionResult.partitionErrorCode() != 
Errors.NONE.code()) {
+                  // Producers expect to handle INVALID_PRODUCER_EPOCH in this 
scenario.
+                  val code = 
+                    if (partitionResult.partitionErrorCode() == 
Errors.PRODUCER_FENCED.code())
+                      Errors.INVALID_PRODUCER_EPOCH.code() 
+                    else 
+                      partitionResult.partitionErrorCode()
+                  unverified.put(tp, Errors.forCode(code))
+                }
+              }
+            }
+            val callback = 
transactionDataAndCallbacks.callbacks(transactionResult.transactionalId())
+            callback(unverified.toMap)
+            unverified.clear()

Review Comment:
   Should we move it to the proper scope then?  (the indentation is hard to 
follow in the PR view, I assumed it's already in the proper scope)



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