Shekharrajak commented on code in PR #22357:
URL: https://github.com/apache/kafka/pull/22357#discussion_r3438410430


##########
clients/clients-integration-tests/src/test/java/org/apache/kafka/clients/consumer/ShareConsumerTransactionTest.java:
##########
@@ -279,6 +282,53 @@ public void testTransactionalShareAckCommitReject() throws 
Exception {
         }
     }
 
+    @ClusterTest
+    @Timeout(120)
+    public void testTransactionalShareAckCommitRejectWithDlqEnabled() throws 
Exception {
+        String groupId = "txn-share-commit-reject-dlq";
+        String dlqTopic = "dlq." + groupId;
+        createDlqTopic(dlqTopic);
+        alterShareAutoOffsetReset(groupId, "earliest");
+        alterShareGroupConfig(groupId, 
GroupConfig.ERRORS_DEADLETTERQUEUE_TOPIC_NAME_CONFIG, dlqTopic);
+
+        try (Producer<byte[], byte[]> producer = createProducer();
+             Producer<byte[], byte[]> transactionalProducer = 
createTransactionalProducer("txn-share-commit-reject-dlq-producer");
+             ShareConsumer<byte[], byte[]> shareConsumer = createShareConsumer(
+                 groupId,
+                 Map.of(ConsumerConfig.SHARE_ACKNOWLEDGEMENT_MODE_CONFIG, 
EXPLICIT));
+             Admin admin = createAdminClient()) {
+
+            producer.send(record("dlq-rejected")).get();
+            producer.flush();
+
+            shareConsumer.subscribe(Set.of(tp.topic()));
+            ConsumerRecords<byte[], byte[]> records = 
waitedPoll(shareConsumer, 2500L, 1);
+            ConsumerRecord<byte[], byte[]> record = records.iterator().next();
+            assertEquals(0L, record.offset());
+            assertEquals("dlq-rejected", new String(record.value(), 
StandardCharsets.UTF_8));
+
+            ShareGroupMetadata groupMetadata = 
shareConsumer.shareGroupMetadata();
+            shareConsumer.acknowledge(record, AcknowledgeType.REJECT);
+            ShareAcknowledgements acknowledgements = 
shareConsumer.acknowledgementsForTransaction();
+            assertFalse(acknowledgements.isEmpty());
+            TopicIdPartition acknowledgedPartition = 
acknowledgements.acknowledgements().keySet().iterator().next();
+            assertEquals(tp, acknowledgedPartition.topicPartition());
+
+            transactionalProducer.initTransactions();
+            transactionalProducer.partitionsFor(tp.topic());
+            transactionalProducer.beginTransaction();
+            
transactionalProducer.sendShareAcknowledgementsToTransaction(acknowledgements, 
groupMetadata);
+            verifyLatestShareStateDeliveryState(groupId, 
acknowledgedPartition, 0L, RecordState.TX_PENDING);
+            transactionalProducer.commitTransaction();
+
+            assertEquals(0, 
shareConsumer.poll(Duration.ofMillis(1000)).count());
+            verifySharePartitionLag(admin, groupId, tp, 0L);
+            waitForDlqRecords(dlqTopic, 1);
+            verifyLatestShareStateDeliveryState(groupId, 
acknowledgedPartition, 0L, RecordState.ARCHIVED);

Review Comment:
   proves commit+reject with DLQ enabled writes one DLQ record and ends in 
ARCHIVED.



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