Myasuka commented on a change in pull request #16582:
URL: https://github.com/apache/flink/pull/16582#discussion_r677268152



##########
File path: 
flink-core/src/main/java/org/apache/flink/api/common/state/InternalCheckpointListener.java
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@@ -0,0 +1,52 @@
+/*
+
+* 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.flink.api.common.state;
+
+import org.apache.flink.annotation.Internal;
+
+/**
+ * The internal checkpoint listener add another {@link 
#notifyCheckpointSubsumed(long)} interface
+ * for internal usage.
+ */
+@Internal
+public interface InternalCheckpointListener extends CheckpointListener {

Review comment:
       My original idea is to add the new method in `CheckpointListener`. 
However, current `CheckpointListener` is already annotated as `public` and the 
semantics of a checkpoint subsumed should be acted as an internal operation 
only for runtime classes.
   Maybe we can see the relationship as `InternalKvState` and `State`.




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