cloud-fan commented on a change in pull request #28725:
URL: https://github.com/apache/spark/pull/28725#discussion_r442723369



##########
File path: 
sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamingStateStoreFormatCompatibilitySuite.scala
##########
@@ -0,0 +1,249 @@
+/*
+ * 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.spark.sql.streaming
+
+import java.io.File
+
+import org.apache.commons.io.FileUtils
+
+import org.apache.spark.SparkException
+import org.apache.spark.sql.Row
+import org.apache.spark.sql.catalyst.streaming.InternalOutputModes.Complete
+import org.apache.spark.sql.execution.streaming.MemoryStream
+import org.apache.spark.sql.functions._
+import org.apache.spark.util.Utils
+
+/**
+ * An integrated test for streaming state store format compatibility.
+ * For each PR breaks this test, we need to pay attention to the underlying 
unsafe row format
+ * changing. All the checkpoint dirs were generated based on Spark version 
2.4.5. If we accept the
+ * changes, it means the checkpoint for Structured Streaming will become 
non-reusable. Please add
+ * a new test for the issue, just like the test suite "SPARK-28067 changed the 
sum decimal unsafe
+ * row format".
+ */
+class StreamingStateStoreFormatCompatibilitySuite extends StreamTest {

Review comment:
       can we explain how the legacy checkpoints are generated? We can either 
put it in doc, or an ignored test.




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