wuchong commented on a change in pull request #13669:
URL: https://github.com/apache/flink/pull/13669#discussion_r508466369



##########
File path: 
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableFactory.java
##########
@@ -308,6 +308,14 @@ private void validateConfigOptions(ReadableConfig config) {
                        LOOKUP_CACHE_MAX_ROWS,
                        LOOKUP_CACHE_TTL
                });
+
+               if (config.get(LOOKUP_MAX_RETRIES) <= 0) {
+                       throw new IllegalArgumentException("The 
'lookup.max-retries' should be greater than 0.");

Review comment:
       Use the option variable instead of hard code the option key. 

##########
File path: 
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableFactory.java
##########
@@ -308,6 +308,14 @@ private void validateConfigOptions(ReadableConfig config) {
                        LOOKUP_CACHE_MAX_ROWS,
                        LOOKUP_CACHE_TTL
                });
+
+               if (config.get(LOOKUP_MAX_RETRIES) <= 0) {
+                       throw new IllegalArgumentException("The 
'lookup.max-retries' should be greater than 0.");
+               }
+
+               if (config.get(SINK_MAX_RETRIES) <= 0) {
+                       throw new IllegalArgumentException("The 
'sink.max-retries' should be greater than 0.");

Review comment:
       ditto.

##########
File path: 
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableFactory.java
##########
@@ -308,6 +308,14 @@ private void validateConfigOptions(ReadableConfig config) {
                        LOOKUP_CACHE_MAX_ROWS,
                        LOOKUP_CACHE_TTL
                });
+
+               if (config.get(LOOKUP_MAX_RETRIES) <= 0) {

Review comment:
       I think it can equal to zero?

##########
File path: 
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableFactory.java
##########
@@ -308,6 +308,14 @@ private void validateConfigOptions(ReadableConfig config) {
                        LOOKUP_CACHE_MAX_ROWS,
                        LOOKUP_CACHE_TTL
                });
+
+               if (config.get(LOOKUP_MAX_RETRIES) <= 0) {
+                       throw new IllegalArgumentException("The 
'lookup.max-retries' should be greater than 0.");

Review comment:
       ```java
   throw new IllegalArgumentException(String.format(
       "The value of '%s' option shouldn't be negative, but is %s.",
       LOOKUP_MAX_RETRIES.key(),
       config.get(LOOKUP_MAX_RETRIES)));
   ```




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