danielcweeks commented on a change in pull request #1844:
URL: https://github.com/apache/iceberg/pull/1844#discussion_r536455852



##########
File path: aws/src/main/java/org/apache/iceberg/aws/AwsClientConfigFactory.java
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@@ -0,0 +1,38 @@
+/*
+ * 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.iceberg.aws;
+
+import java.io.Serializable;
+import org.apache.iceberg.catalog.CatalogConfigurable;
+import software.amazon.awssdk.awscore.client.builder.AwsClientBuilder;
+import software.amazon.awssdk.awscore.client.builder.AwsSyncClientBuilder;
+
+/**
+ * Interface for any customization of AWS client.
+ * <p>
+ * User can provide an implementation of this factory to perform any 
modification to AWS clients,
+ * such as credentials provider, region, endpoint, http client, etc.
+ * See {@link AssumeRoleClientConfigFactory} as an example.
+ */
+public interface AwsClientConfigFactory extends CatalogConfigurable, 
Serializable {

Review comment:
       @jackye1995 I like this better, but I feel like I'm not following what 
value the `AwsClientConfigurer` adds at this point.  It seems that 
`AwsClientConfigurer` interface is just a duplication of the 
`setDefaultsAndConfigure` in `AwsClientFactory` (they have the same signature). 
 Why wouldn't we just drop the `AwsClientConfigurer` and dynamically load the 
factory? Then if someone wants to extend the configuration, they just extend 
`AwsClientFactory` and override the `configure` method?  It seems like we would 
still be able to add new clients and the configure method would still apply to 
any of the standard client builder options.
   
   The added value this provides is that since the Factory is responsible for 
instantiation, we can now override that behavior (e.g. cache/reuse/proxy or 
force new instances for instances of the client).  That may not be necessary 
for glue catalog as I assume there would only be one instance, but for S3FileIO 
it may be helpful. 




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