dramaticlly commented on code in PR #18440:
URL: https://github.com/apache/iceberg/pull/18440#discussion_r4544835508


##########
api/src/main/java/org/apache/iceberg/RotateEncryptionKeys.java:
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@@ -0,0 +1,61 @@
+/*
+ * 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;
+
+import java.util.List;
+
+/**
+ * API for rotating the encryption keys of a table so that they no longer 
depend on a superseded
+ * version of the table master key.
+ *
+ * <p>Only the keys reachable from the current snapshot are rotated. Older 
snapshots keep depending
+ * on the previous keys until they are expired.
+ *
+ * <p>{@link #apply()} returns the manifests that will be replaced.
+ */
+public interface RotateEncryptionKeys extends 
PendingUpdate<List<ManifestFile>> {
+
+  /**
+   * An enum representing the lowest key that is regenerated. The keys above 
it are regenerated too,
+   * the keys directly below it are re-wrapped under the new ones, and the 
keys further below are
+   * left unchanged.
+   */
+  enum KeyRegenerationLevel {
+    /** Regenerate the key encryption key without committing a new snapshot. */
+    KEY_ENCRYPTION_KEY,
+    /**
+     * Regenerate the manifest list key and the keys above it, committing a 
new snapshot without
+     * rewriting any manifest.
+     */
+    SNAPSHOT_KEY,
+    /** Regenerate the manifest keys and the keys above them, rewriting every 
manifest (default). */
+    MANIFEST_KEY

Review Comment:
    Originally I was thinking for MANIFEST_KEY. RewriteManifests followed by 
the RotateEncryptionKeys but this lose the atomicity, let me see what does it 
take to unify the change and will update accordingly!



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