omarsmak commented on a change in pull request #3308:
URL: https://github.com/apache/iceberg/pull/3308#discussion_r731605215



##########
File path: flink/src/main/java/org/apache/iceberg/flink/FlinkCatalogFactory.java
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@@ -83,6 +83,10 @@
   static CatalogLoader createCatalogLoader(String name, Map<String, String> 
properties, Configuration hadoopConf) {
     String catalogImpl = properties.get(CatalogProperties.CATALOG_IMPL);
     if (catalogImpl != null) {
+      String catalogType = properties.get(ICEBERG_CATALOG_TYPE);
+      Preconditions.checkArgument(catalogType == null,
+          "Cannot create catalog %s, both catalog-type and catalog-impl are 
set: catalog-type=%s, catalog-impl=%s",

Review comment:
       > Do we have recommendations on which values to set that we can provide?
   
   You mean only `hive` or `hadoop`? 🤔 




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