aljoscha commented on a change in pull request #6105: [FLINK-8500] Get the
timestamp of the Kafka message from kafka consumer
URL: https://github.com/apache/flink/pull/6105#discussion_r212222385
##########
File path:
flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/util/serialization/KeyedDeserializationSchema.java
##########
@@ -45,6 +45,22 @@
*/
T deserialize(byte[] messageKey, byte[] message, String topic, int
partition, long offset) throws IOException;
+ /**
+ * Deserializes the byte message.
+ *
+ * @param messageKey the key as a byte array (null if no key has been
set).
+ * @param message The message, as a byte array (null if the message was
empty or deleted).
+ * @param partition The partition the message has originated from.
+ * @param offset the offset of the message in the original source (for
example the Kafka offset).
+ * @param timestamp the timestamp of the consumer record
+ * @param timestampType The timestamp type, could be NO_TIMESTAMP,
CREATE_TIME or INGEST_TIME.
+ *
+ * @return The deserialized message as an object (null if the message
cannot be deserialized).
+ */
+ default T deserialize(byte[] messageKey, byte[] message, String topic,
int partition, long offset, long timestamp, TimestampType timestampType) throws
IOException {
Review comment:
Yes, to unblock this I thing we can go with this approach, basically the
schema becomes this:
```
@PublicEvolving
public interface KeyedDeserializationSchema<T> extends Serializable,
ResultTypeQueryable<T> {
@Deprecated
default T deserialize(byte[] messageKey, byte[] message, String topic,
int partition, long offset) {
throw new RuntimeException("blammo");
}
default T deserialize(byte[] messageKey, byte[] message, String
topic, int partition, long offset, long timestamp) {
return deserialize(/* call the other method */);
}
boolean isEndOfStream(T nextElement);
}
```
With this, if you have an existing implementation of
`KeyedDeserializationSchema` it will continue to work without any changes. If
you implement a new one you have to implement one of the methods, otherwise the
exception is thrown. And all Flink code only calls the version that takes the
timestamp.
What do you think?
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