rdblue commented on code in PR #14509:
URL: https://github.com/apache/iceberg/pull/14509#discussion_r2496233053


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api/src/main/java/org/apache/iceberg/SnapshotUpdateValidator.java:
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@@ -0,0 +1,46 @@
+/*
+ * 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.function.BiConsumer;
+
+/**
+ * Interface to support validating snapshots during the commit process.
+ *
+ * <p>Validation will be called after the table metadata is refreshed but 
before the updates are
+ * committed to the table.
+ */
+@FunctionalInterface
+public interface SnapshotUpdateValidator
+    extends BiConsumer<Iterable<Snapshot>, Iterable<Snapshot>> {

Review Comment:
   I would expect validation to be a bit more explicit, like a 
`BiFunction<Iterable<Snapshot>, Iterable<Snapshot>, Boolean>` so that it has to 
return that the changes are either valid or invalid. Since this is wrapping a 
function, we can still pass an error message by adding a `String 
errorMessage()` function. That would also allow Iceberg to control the 
exception type that is thrown (`ValidationException`).



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