cmccabe commented on a change in pull request #11689:
URL: https://github.com/apache/kafka/pull/11689#discussion_r797873026



##########
File path: 
clients/src/test/java/org/apache/kafka/clients/producer/KafkaProducerTest.java
##########
@@ -1506,6 +1508,46 @@ public void testNullTopicName() {
             "key".getBytes(StandardCharsets.UTF_8), 
"value".getBytes(StandardCharsets.UTF_8)));
     }
 
+    @Test
+    public void testCallbackHandlesError() throws Exception {
+        Map<String, Object> configs = new HashMap<>();
+        configs.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9000");
+        configs.put(ProducerConfig.MAX_BLOCK_MS_CONFIG, "1000");
+
+        Time time = new MockTime();
+        ProducerMetadata producerMetadata = newMetadata(0, Long.MAX_VALUE);
+        MockClient client = new MockClient(time, producerMetadata);
+
+        String invalidTopicName = "topic abc"; // Invalid topic name due to 
space
+
+        try (Producer<String, String> producer = kafkaProducer(configs, new 
StringSerializer(), new StringSerializer(),
+                producerMetadata, client, null, time)) {
+            ProducerRecord<String, String> record = new 
ProducerRecord<>(invalidTopicName, "HelloKafka");
+
+            // Here's the important piece of the test. Let's make sure that 
the RecordMetadata we get
+            // is non-null and adheres to the onCompletion contract.
+            Callback callBack = (recordMetadata, exception) -> {
+                assertNotNull(exception);
+                assertNotNull(recordMetadata);
+
+                assertNotNull(recordMetadata.topic(), "Topic name should be 
valid even on send failure");

Review comment:
       can you please also check that the partition id gets set to -1




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