the-other-tim-brown commented on code in PR #13098:
URL: https://github.com/apache/hudi/pull/13098#discussion_r2033920209


##########
hudi-client/hudi-spark-client/src/test/java/org/apache/hudi/io/TestHoodieTimelineArchiver.java:
##########
@@ -742,6 +745,37 @@ public void testReadArchivedCompactionPlan() throws 
Exception {
     }
   }
 
+  @Test
+  public void testDowngradeArchivedTimeline() throws Exception {
+    HoodieWriteConfig writeConfig = initTestTableAndGetWriteConfig(true, 1, 2, 
5, HoodieTableType.COPY_ON_WRITE);
+
+    // do ingestion and trigger archive actions here.
+    Map<String, Integer> cleanStats = new HashMap<>();
+    cleanStats.put("p1", 1);
+    cleanStats.put("p2", 2);
+    for (int i = 1; i < 11; i += 2) {
+      if (i == 3) {
+        testTable.doCluster(String.format("%08d", i), Collections.emptyMap(), 
Arrays.asList("p1", "p2"), 20);
+      } else {
+        testTable.doWriteOperation(String.format("%08d", i), 
WriteOperationType.UPSERT, i == 1 ? Arrays.asList("p1", "p2") : 
Collections.emptyList(), Arrays.asList("p1", "p2"), 2);
+        testTable.doClean(String.format("%08d", i + 1), cleanStats, 
Collections.emptyMap());
+      }
+    }
+    archiveAndGetCommitsList(writeConfig);

Review Comment:
   I still don't see the commit types validated. Just some looping with 
skipping of commits. The output of this method will tell you what was in the 
timeline and what is remaining after the archival. We can use the diff to get 
the set of instants that are archived. Once we have that, we can check that the 
proper commit types are present.



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