yuxiqian commented on code in PR #3461:
URL: https://github.com/apache/flink-cdc/pull/3461#discussion_r1671422254


##########
flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-kafka/src/main/java/org/apache/flink/cdc/connectors/kafka/json/debezium/DebeziumJsonSerializationSchema.java:
##########
@@ -185,14 +190,21 @@ public byte[] serialize(Event event) {
         }
     }
 
+    /**
+     * Refer to <a
+     * 
href="https://debezium.io/documentation/reference/1.9/connectors/mysql.html";>...</a>.

Review Comment:
   Hyperlink text 
[`...`](https://debezium.io/documentation/reference/1.9/connectors/mysql.html) 
could be replaced with some meaningful words, like:
   
   ```suggestion
        * Refer to <a
        * 
href="https://debezium.io/documentation/reference/1.9/connectors/mysql.html";>Debezium
 docs</a> for more details.
   ```



##########
flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-kafka/src/main/java/org/apache/flink/cdc/connectors/kafka/json/canal/CanalJsonSerializationSchema.java:
##########
@@ -200,14 +211,19 @@ public byte[] serialize(Event event) {
         }
     }
 
+    /**
+     * Refer to <a
+     * 
href="https://github.com/alibaba/canal/blob/9373429015c0f25318b703833a1d7913676f2aa3/protocol/src/main/java/com/alibaba/otter/canal/protocol/FlatMessage.java#L74";>...</a>.
+     */

Review Comment:
   Since Canal has no official protocol docs, will it be better if we change 
the link to [Canal | Apache 
Flink](https://nightlies.apache.org/flink/flink-docs-master/docs/connectors/table/formats/canal/#available-metadata)?



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