JingsongLi commented on code in PR #1031:
URL: https://github.com/apache/incubator-paimon/pull/1031#discussion_r1177569206


##########
paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/action/cdc/mysql/MySqlActionUtils.java:
##########
@@ -202,4 +205,37 @@ static MySqlSource<String> buildMySqlSource(Configuration 
mySqlConfig) {
                 new JsonDebeziumDeserializationSchema(true, 
customConverterConfigs);
         return 
sourceBuilder.deserializer(schema).includeSchemaChanges(true).build();
     }
+
+    private static void validateMySqlConfig(Configuration mySqlConfig) {
+        checkArgument(
+                mySqlConfig.get(MySqlSourceOptions.HOSTNAME) != null

Review Comment:
   `mySqlConfig.contains(MySqlSourceOptions.HOSTNAME)`
   Just check `contains` is OK, if it is a empty string, detailed message will 
be reported in mysql client.



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