dennishuo commented on code in PR #1466:
URL: https://github.com/apache/polaris/pull/1466#discussion_r2073870563


##########
polaris-core/src/main/java/org/apache/polaris/core/connection/hadoop/HadoopConnectionConfigInfoDpo.java:
##########
@@ -0,0 +1,88 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.polaris.core.connection.hadoop;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.base.MoreObjects;
+import jakarta.annotation.Nonnull;
+import jakarta.annotation.Nullable;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.iceberg.CatalogProperties;
+import org.apache.polaris.core.admin.model.ConnectionConfigInfo;
+import org.apache.polaris.core.admin.model.HadoopConnectionConfigInfo;
+import org.apache.polaris.core.connection.AuthenticationParametersDpo;
+import org.apache.polaris.core.connection.ConnectionConfigInfoDpo;
+import org.apache.polaris.core.connection.ConnectionType;
+import org.apache.polaris.core.secrets.UserSecretsManager;
+
+/**
+ * The internal persistence-object counterpart to {@link
+ * org.apache.polaris.core.admin.model.HadoopConnectionConfigInfo} defined in 
the API model.
+ */
+public class HadoopConnectionConfigInfoDpo extends ConnectionConfigInfoDpo {
+
+  private final String warehouse;
+
+  public HadoopConnectionConfigInfoDpo(
+      @JsonProperty(value = "uri", required = true) @Nonnull String uri,
+      @JsonProperty(value = "authenticationParameters", required = true) 
@Nonnull

Review Comment:
   Right, identity-passthrough/delegation is important long-term, but has a lot 
of complicated prerequisites and other dependencies on how we express federated 
identities and user-isolated caching of metadata or storage credentials, so in 
the meantime we should just clearly document what the "powerful 
connectionconfig" model implies.



##########
polaris-core/src/main/java/org/apache/polaris/core/config/FeatureConfiguration.java:
##########
@@ -234,4 +235,11 @@ public static void enforceFeatureEnabledOrThrow(
           .description("If true, the policy-store endpoints are enabled")
           .defaultValue(true)
           .buildFeatureConfiguration();
+
+  public static final FeatureConfiguration<List<String>> 
SUPPORTED_CATALOG_CONNECTION_TYPES =
+      PolarisConfiguration.<List<String>>builder()
+          .key("SUPPORTED_CATALOG_CONNECTION_TYPES")
+          .description("The list of supported catalog connection types for 
federation")
+          .defaultValue(List.of(ConnectionType.ICEBERG_REST.name(), 
ConnectionType.HADOOP.name()))

Review Comment:
   Is it possible to make this default an empty list, so that whoever wants to 
enable the federation feature has to explicitly opt-in to the connection types 
they want?
   
   And/or set it to an empty list in application.properties. Or if empty list 
doesn't work for some reason, it seems ICEBERG_REST-only is a reasonable 
initial default since it's the minimal-dependency one long-term with a more 
well-defined security boundary.



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