nastra commented on code in PR #7590:
URL: https://github.com/apache/iceberg/pull/7590#discussion_r1192156737


##########
aws/src/main/java/org/apache/iceberg/aws/s3/S3FileIOAwsClientFactory.java:
##########
@@ -0,0 +1,86 @@
+/*
+ * 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.s3;
+
+import java.util.Map;
+import org.apache.iceberg.aws.AwsClientFactories;
+import org.apache.iceberg.aws.AwsClientProperties;
+import org.apache.iceberg.aws.HttpClientProperties;
+import org.apache.iceberg.util.PropertyUtil;
+import software.amazon.awssdk.services.s3.S3Client;
+
+public class S3FileIOAwsClientFactory {
+  /**
+   * This property allows customizing AWS client factory implementation class. 
If this property is
+   * set, only {@link S3FileIOAwsClientFactory} class will be instantiated. If 
this property wasn't
+   * set, will load one of {@link org.apache.iceberg.aws.AwsClientFactory} 
factory classes to
+   * provide backward compatibility.
+   */
+  public static final String CLIENT_FACTORY = "s3.client-factory-impl";
+
+  private final S3FileIOProperties s3FileIOProperties;
+  private final HttpClientProperties httpClientProperties;
+  private final AwsClientProperties awsClientProperties;
+
+  S3FileIOAwsClientFactory(
+      S3FileIOProperties s3FileIOProperties,
+      HttpClientProperties httpClientProperties,
+      AwsClientProperties awsClientProperties) {
+    this.s3FileIOProperties = s3FileIOProperties;
+    this.httpClientProperties = httpClientProperties;
+    this.awsClientProperties = awsClientProperties;
+  }
+
+  /**
+   * Returns an instance of a client factory class based on properties. If the 
{@value
+   * #CLIENT_FACTORY} is set, will return an instance of type {@link 
S3FileIOAwsClientFactory}.
+   * Otherwise, will return an instance of type {@link 
org.apache.iceberg.aws.AwsClientFactory} for
+   * backward compatibility. To provide
+   *
+   * @param properties catalog properties
+   * @param <T> a java return type
+   * @return factory class object
+   */
+  @SuppressWarnings("unchecked")
+  public static <T> T getS3ClientFactoryImpl(Map<String, String> properties) {
+    boolean useS3FileIO = PropertyUtil.propertyAsBoolean(properties, 
CLIENT_FACTORY, false);

Review Comment:
   nit: `useS3FileIO` is slightly misleading, maybe `initFactory` or something 
along those lines?



##########
aws/src/test/java/org/apache/iceberg/aws/s3/TestS3FileIOAwsClientFactory.java:
##########
@@ -0,0 +1,58 @@
+/*
+ * 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.s3;
+
+import java.util.Map;
+import org.apache.iceberg.aws.AwsClientFactory;
+import org.apache.iceberg.relocated.com.google.common.collect.Maps;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class TestS3FileIOAwsClientFactory {
+
+  @Test
+  public void testS3FileIOImplSetToTrue() {
+    Map<String, String> properties = Maps.newHashMap();
+    properties.put(S3FileIOAwsClientFactory.CLIENT_FACTORY, "true");
+    Object factoryImpl = 
S3FileIOAwsClientFactory.getS3ClientFactoryImpl(properties);
+    Assertions.assertThat(factoryImpl instanceof S3FileIOAwsClientFactory)

Review Comment:
   can be simplified to 
`assertThat(factoryImpl).isInstanceOf(S3FileIOAwsClientFactory.class)`



##########
aws/src/main/java/org/apache/iceberg/aws/s3/S3FileIOAwsClientFactory.java:
##########
@@ -0,0 +1,86 @@
+/*
+ * 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.s3;
+
+import java.util.Map;
+import org.apache.iceberg.aws.AwsClientFactories;
+import org.apache.iceberg.aws.AwsClientProperties;
+import org.apache.iceberg.aws.HttpClientProperties;
+import org.apache.iceberg.util.PropertyUtil;
+import software.amazon.awssdk.services.s3.S3Client;
+
+public class S3FileIOAwsClientFactory {

Review Comment:
   should this be `Serializable`?



##########
aws/src/main/java/org/apache/iceberg/aws/s3/S3FileIOAwsClientFactory.java:
##########
@@ -0,0 +1,86 @@
+/*
+ * 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.s3;
+
+import java.util.Map;
+import org.apache.iceberg.aws.AwsClientFactories;
+import org.apache.iceberg.aws.AwsClientProperties;
+import org.apache.iceberg.aws.HttpClientProperties;
+import org.apache.iceberg.util.PropertyUtil;
+import software.amazon.awssdk.services.s3.S3Client;
+
+public class S3FileIOAwsClientFactory {
+  /**
+   * This property allows customizing AWS client factory implementation class. 
If this property is
+   * set, only {@link S3FileIOAwsClientFactory} class will be instantiated. If 
this property wasn't
+   * set, will load one of {@link org.apache.iceberg.aws.AwsClientFactory} 
factory classes to
+   * provide backward compatibility.
+   */
+  public static final String CLIENT_FACTORY = "s3.client-factory-impl";
+
+  private final S3FileIOProperties s3FileIOProperties;
+  private final HttpClientProperties httpClientProperties;
+  private final AwsClientProperties awsClientProperties;
+
+  S3FileIOAwsClientFactory(
+      S3FileIOProperties s3FileIOProperties,
+      HttpClientProperties httpClientProperties,
+      AwsClientProperties awsClientProperties) {
+    this.s3FileIOProperties = s3FileIOProperties;
+    this.httpClientProperties = httpClientProperties;
+    this.awsClientProperties = awsClientProperties;
+  }
+
+  /**
+   * Returns an instance of a client factory class based on properties. If the 
{@value
+   * #CLIENT_FACTORY} is set, will return an instance of type {@link 
S3FileIOAwsClientFactory}.
+   * Otherwise, will return an instance of type {@link 
org.apache.iceberg.aws.AwsClientFactory} for
+   * backward compatibility. To provide
+   *
+   * @param properties catalog properties
+   * @param <T> a java return type
+   * @return factory class object
+   */
+  @SuppressWarnings("unchecked")
+  public static <T> T getS3ClientFactoryImpl(Map<String, String> properties) {

Review Comment:
   to me it feels like this functionality should live in a slimmed down version 
of  `AwsClientFactories` where we don't have compile-time dependencies to 
dynamo/glue/.. (basically without the `DefaultAwsClientFactory`)



##########
aws/src/test/java/org/apache/iceberg/aws/s3/TestS3FileIOAwsClientFactory.java:
##########
@@ -0,0 +1,58 @@
+/*
+ * 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.s3;
+
+import java.util.Map;
+import org.apache.iceberg.aws.AwsClientFactory;
+import org.apache.iceberg.relocated.com.google.common.collect.Maps;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class TestS3FileIOAwsClientFactory {
+
+  @Test
+  public void testS3FileIOImplSetToTrue() {
+    Map<String, String> properties = Maps.newHashMap();
+    properties.put(S3FileIOAwsClientFactory.CLIENT_FACTORY, "true");
+    Object factoryImpl = 
S3FileIOAwsClientFactory.getS3ClientFactoryImpl(properties);
+    Assertions.assertThat(factoryImpl instanceof S3FileIOAwsClientFactory)
+        .withFailMessage(
+            "should instantiate an object of type S3FileIOAwsClientFactory 
when s3.client-factory-impl is set")
+        .isTrue();
+    assert factoryImpl instanceof S3FileIOAwsClientFactory;

Review Comment:
   not sure why we're using `assert` here. I believe this would even be always 
ignored because they have to be explicitly enabled.



##########
aws/src/main/java/org/apache/iceberg/aws/s3/S3FileIOAwsClientFactory.java:
##########
@@ -0,0 +1,86 @@
+/*
+ * 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.s3;
+
+import java.util.Map;
+import org.apache.iceberg.aws.AwsClientFactories;
+import org.apache.iceberg.aws.AwsClientProperties;
+import org.apache.iceberg.aws.HttpClientProperties;
+import org.apache.iceberg.util.PropertyUtil;
+import software.amazon.awssdk.services.s3.S3Client;
+
+public class S3FileIOAwsClientFactory {
+  /**
+   * This property allows customizing AWS client factory implementation class. 
If this property is
+   * set, only {@link S3FileIOAwsClientFactory} class will be instantiated. If 
this property wasn't
+   * set, will load one of {@link org.apache.iceberg.aws.AwsClientFactory} 
factory classes to
+   * provide backward compatibility.
+   */
+  public static final String CLIENT_FACTORY = "s3.client-factory-impl";

Review Comment:
   `impl` in the property name usually suggests that one would specify an 
actual implementation class, but here we're using a boolean, which seems 
inconsistent



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