steveloughran commented on code in PR #6874:
URL: https://github.com/apache/hadoop/pull/6874#discussion_r1686963532


##########
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3AEncryptionSSEKMSWithEncryptionContext.java:
##########
@@ -0,0 +1,100 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.hadoop.fs.s3a;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.util.Set;
+
+import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableSet;
+
+import org.apache.commons.lang.StringUtils;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.s3a.impl.S3AEncryption;
+
+import static org.apache.hadoop.fs.contract.ContractTestUtils.skip;
+import static org.apache.hadoop.fs.s3a.Constants.S3_ENCRYPTION_CONTEXT;
+import static org.apache.hadoop.fs.s3a.Constants.S3_ENCRYPTION_KEY;
+import static org.apache.hadoop.fs.s3a.S3AEncryptionMethods.DSSE_KMS;
+import static org.apache.hadoop.fs.s3a.S3AEncryptionMethods.SSE_KMS;
+import static org.apache.hadoop.fs.s3a.S3ATestUtils.assume;
+import static org.apache.hadoop.fs.s3a.S3ATestUtils.getTestBucketName;
+
+/**
+ * Concrete class that extends {@link AbstractTestS3AEncryption}
+ * and tests KMS encryption with encryption context.
+ * S3's HeadObject doesn't return the object's encryption context.
+ * Therefore, we don't have a way to assert its value in code.
+ * In order to properly test if the encryption context is being set,
+ * the KMS key or the IAM User need to have a deny statements like the one 
below in the policy:
+ * <pre>
+ * {
+ *     "Effect": "Deny",
+ *     "Principal": {
+ *         "AWS": "*"
+ *     },
+ *     "Action": "kms:Decrypt",
+ *     "Resource": "*",
+ *     "Condition": {
+ *         "StringNotEquals": {
+ *             "kms:EncryptionContext:project": "hadoop"
+ *         }
+ *     }
+ * }
+ * </pre>
+ * With the statement above, S3A will fail to read the object from S3 if it 
was encrypted
+ * without the key-pair <code>"project": "hadoop"</code> in the encryption 
context.
+ */
+public class ITestS3AEncryptionSSEKMSWithEncryptionContext
+    extends AbstractTestS3AEncryption {
+
+  private static final Set<S3AEncryptionMethods> KMS_ENCRYPTION_ALGORITHMS = 
ImmutableSet.of(
+      SSE_KMS, DSSE_KMS);
+
+  private S3AEncryptionMethods encryptionAlgorithm;
+
+  @Override
+  protected Configuration createConfiguration() {
+    try {
+      // get the KMS key and context for this test.
+      Configuration c = new Configuration();
+      final String bucketName = getTestBucketName(c);
+      String kmsKey = S3AUtils.getS3EncryptionKey(bucketName, c);
+      String encryptionContext = 
S3AEncryption.getS3EncryptionContext(bucketName, c);
+      encryptionAlgorithm = S3AUtils.getEncryptionAlgorithm(bucketName, c);
+      assume("Expected a KMS encryption algorithm",
+          KMS_ENCRYPTION_ALGORITHMS.contains(encryptionAlgorithm));
+      if (StringUtils.isBlank(encryptionContext)) {
+        skip(S3_ENCRYPTION_CONTEXT + " is not set.");
+      }
+      Configuration conf = super.createConfiguration();
+      conf.set(S3_ENCRYPTION_KEY, kmsKey);

Review Comment:
   use `removeBaseAndBucketOverrides(conf, String...)` and list all options you 
intend to set..stops overrides getting in the way. doesn't work for jceks 
overrides, which always take priority



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