JingGe commented on a change in pull request #18397:
URL: https://github.com/apache/flink/pull/18397#discussion_r790964213



##########
File path: 
flink-connectors/flink-connector-kafka/src/test/java/org/apache/flink/connector/kafka/sink/KafkaRecordSerializationSchemaBuilderTest.java
##########
@@ -160,6 +165,37 @@ public void testSerializeRecordWithKey() {
         assertArrayEquals(record.value(), serializationSchema.serialize("a"));
     }
 
+    @Test
+    public void testNoConfigurableKafkaKeySerializer() throws Exception {
+        final Map<String, String> config = ImmutableMap.of("simpleKey", 
"simpleValue");
+        final KafkaRecordSerializationSchema<String> schema =
+                KafkaRecordSerializationSchema.builder()
+                        .setTopic(DEFAULT_TOPIC)
+                        // use StringSerializer as dummy Serializer, since 
ValueSerializer is

Review comment:
       I'll change it. Just out of curiosity, I didn't find the consistency 
rule of single line comment with the first letter being capital. There are also 
many opposite examples using lowercase in the codebase, e.g. 
https://github.com/JingGe/flink/blob/master/flink-connectors/flink-connector-files/src/main/java/org/apache/flink/connector/file/src/impl/StreamFormatAdapter.java
 
   
https://github.com/JingGe/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/CheckpointCoordinator.java




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