openinx commented on a change in pull request #1565:
URL: https://github.com/apache/iceberg/pull/1565#discussion_r502257571



##########
File path: flink/src/main/java/org/apache/iceberg/flink/CatalogLoader.java
##########
@@ -43,18 +44,18 @@ static CatalogLoader hive(String name, Configuration 
hadoopConf, String uri, int
 
   class HadoopCatalogLoader implements CatalogLoader {
     private final String catalogName;
-    private final Configuration hadoopConf;
+    private final SerializableConfiguration hadoopConf;

Review comment:
       Nice catch, since the `CatalogLoader` need to be serializable, so all 
members need to be serializable. Do we need to add several unit tests to 
address the serializable issue so that we won't break it in future ?   similar 
to the unit test TestScanTaskSerialization ? 

##########
File path: flink/src/main/java/org/apache/iceberg/flink/CatalogLoader.java
##########
@@ -43,18 +44,18 @@ static CatalogLoader hive(String name, Configuration 
hadoopConf, String uri, int
 
   class HadoopCatalogLoader implements CatalogLoader {
     private final String catalogName;
-    private final Configuration hadoopConf;
+    private final SerializableConfiguration hadoopConf;

Review comment:
       `TableLoader`  need the similar unit test. 

##########
File path: flink/src/main/java/org/apache/iceberg/flink/TableLoader.java
##########
@@ -45,23 +46,30 @@ static TableLoader fromCatalog(CatalogLoader catalogLoader, 
TableIdentifier iden
   }
 
   static TableLoader fromHadoopTable(String location) {

Review comment:
       Is this only visible for testing ?  Moving to test package ? 




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