rakeshadr commented on code in PR #10849:
URL: https://github.com/apache/ozone/pull/10849#discussion_r3649353606


##########
hadoop-ozone/cli-debug/src/test/java/org/apache/hadoop/ozone/debug/om/TestContainerToKeyMapping.java:
##########
@@ -189,6 +192,18 @@ public void 
testContainerToKeyMappingWithMPUOnlyFileNames() {
     assertThat(output).contains("/vol1/obs-bucket/mpuKey/test-upload-id");
   }
 
+  @Test
+  public void testContainerToKeyMappingWithSplitSchemaMPU() {
+    int exitCode = execute("--containers", String.valueOf(CONTAINER_ID_4), 
"--in-progress");

Review Comment:
   Not a bug, but using a distinct `CONTAINER_ID_5` for the new tests would 
make the split-schema test self-contained and easier to reason about in future.
   
   `CONTAINER_ID_4` for both legacy and split MPU 
`testContainerToKeyMappingWithSplitSchemaMPU`



##########
hadoop-ozone/ozone-manager/src/test/java/org/apache/hadoop/ozone/om/service/TestKeyLifecycleService.java:
##########
@@ -3340,4 +3350,111 @@ private OmMultipartInfo 
createTestMultipartUpload(String volumeName, String buck
   public static String uniqueObjectName(String prefix) {
     return prefix + OBJECT_COUNTER.getAndIncrement();
   }
+
+  @Test
+  public void testPartCountIoExceptionSkipsUploadContinuesBucket(@TempDir File 
tempDir)
+      throws Exception {
+    OzoneConfiguration omConf = new OzoneConfiguration();
+    omConf.set(OZONE_OM_DB_DIRS, tempDir.getAbsolutePath());
+    OMMetadataManager omMetadataManager = new OmMetadataManagerImpl(omConf, 
null);
+    try {
+      String uploadA = OMMultipartUploadUtils.getMultipartUploadId();
+      String uploadB = OMMultipartUploadUtils.getMultipartUploadId();
+      String uploadC = OMMultipartUploadUtils.getMultipartUploadId();
+
+      addSplitSchemaPart(omMetadataManager, uploadA, 1);
+      addSplitSchemaPart(omMetadataManager, uploadA, 2);
+      addSplitSchemaPart(omMetadataManager, uploadC, 1);
+
+      OMMetadataManager mockMM = Mockito.spy(omMetadataManager);
+      Table<OmMultipartPartKey, OmMultipartPartInfo> mockPartsTable =
+          Mockito.spy(omMetadataManager.getMultipartPartsTable());
+      when(mockMM.getMultipartPartsTable()).thenReturn(mockPartsTable);
+      when(mockPartsTable.iterator(eq(OmMultipartPartKey.prefix(uploadB))))
+          .thenThrow(new IOException("simulated corruption"));
+
+      assertEquals(2, OMMultipartUploadUtils.countParts(mockMM, uploadA));
+      assertThrows(IOException.class,
+          () -> OMMultipartUploadUtils.countParts(mockMM, uploadB));
+
+      KeyLifecycleService.PartCountLimitedList list =
+          new KeyLifecycleService.PartCountLimitedList(10);
+      for (String uploadId : Arrays.asList(uploadA, uploadB, uploadC)) {
+        try {
+          int partCount = OMMultipartUploadUtils.countParts(mockMM, uploadId);
+          list.add(new OmMultipartUpload("v", "b", "k", uploadId), partCount);
+        } catch (IOException e) {
+          // per-MPU skip — bucket loop continues
+        }
+      }
+      assertEquals(2, list.size());

Review Comment:
   Can you please add comments to help maintainers.
   ```
    // A (2 parts) and C (1 part) are added; B is skipped due to IOException
    assertEquals(2, list.size()); // uploadA and uploadC only
    assertEquals(3, list.getPartCount()); // 2 (uploadA) + 1 (uploadC)
   ```



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