danielcweeks commented on a change in pull request #1844:
URL: https://github.com/apache/iceberg/pull/1844#discussion_r539742821



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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:
       Sorry, this just dropped off my radar.
   
   I don't actually disagree with in concept with any of the items above, but I 
would propose handling it differently.
   
   Make AwsClientFactory an interface, which would just expose the client calls 
(e.g. `factory.s3()`, `factory.glue()`).  Create a `DefaultAwsClientFactory` 
that has the common configuration `setDefaultsAndConfigure`.  Create an 
`StsAwsClientFactory` that overrides for `setDefaultsAndConfigure` for the 
common functionality.
   
   Now I can see your point in #3 that is someone were to override the client 
creation, they would have to directly call the `setDefaultsAndConfigure`, but I 
don't feel like preventing users from overriding the creation of the client is 
a good tradeoff for ensuring that they're consistently configured.
   
   We could separate the instantiation and access of the client in the factory 
so that you can enforce the configure path, but I feel like that's just 
overcomplicating the situation.  Doing the above just gets us back to a more 
traditional, interface and implementation design that I feel will make more 
sense for anyone looking to provide a custom implementation.
   




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