smengcl commented on code in PR #3981:
URL: https://github.com/apache/ozone/pull/3981#discussion_r1040017764


##########
hadoop-hdds/rocksdb-checkpoint-differ/src/main/java/org/apache/ozone/rocksdiff/CompactionNode.java:
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@@ -0,0 +1,74 @@
+/*
+ * 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.ozone.rocksdiff;
+
+/**
+ * Node in the compaction DAG that represents an SST file.
+ */
+public class CompactionNode {
+  // Name of the SST file
+  private final String fileName;
+  // The last snapshot created before this node came into existence
+  private final String snapshotId;

Review Comment:
   `snapshotId` here is purely for debugging. It is not used in the SST diff 
calculation at all.
   
   
https://github.com/smengcl/hadoop-ozone/blob/8c62f798d49e925610bfba98ea42ff0666589393/hadoop-hdds/rocksdb-checkpoint-differ/src/main/java/org/apache/ozone/rocksdiff/RocksDBCheckpointDiffer.java#L855-L856
   



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