slfan1989 commented on code in PR #10395:
URL: https://github.com/apache/ozone/pull/10395#discussion_r3340239744


##########
hadoop-hdds/container-service/src/test/java/org/apache/hadoop/ozone/container/diskbalancer/TestDiskBalancerYaml.java:
##########
@@ -101,4 +102,50 @@ public void testReadYamlNullContainerStatesUsesDefault() 
throws IOException {
     DiskBalancerInfo info = DiskBalancerYaml.readDiskBalancerInfoFile(file);
     
Assertions.assertEquals(DiskBalancerConfiguration.DEFAULT_CONTAINER_STATES, 
info.getContainerStates());
   }
+
+  @ParameterizedTest
+  @MethodSource("invalidDiskBalancerYamlCases")
+  public void testReadYamlRejectsInvalidPersistedInfo(String yaml,
+      String expectedMessage) throws IOException {
+    File file = new File(tmpDir.toString(),
+        OZONE_SCM_DATANODE_DISK_BALANCER_INFO_FILE_DEFAULT);
+    Files.write(file.toPath(), yaml.getBytes(StandardCharsets.UTF_8));
+
+    IOException ex = assertThrows(IOException.class,
+        () -> DiskBalancerYaml.readDiskBalancerInfoFile(file));
+
+    Assertions.assertTrue(ex.getMessage().contains(expectedMessage),
+        () -> "Expected message to contain '" + expectedMessage + "': "
+            + ex.getMessage());
+  }
+
+  public static Stream<Arguments> invalidDiskBalancerYamlCases() {
+    return Stream.of(
+        Arguments.of(validYaml()
+            .replace("version: 1\n", "version: 99\n"),
+            "Unsupported DiskBalancer info version: 99"),
+        Arguments.of(validYaml()
+            .replace("version: 1\n", ""),
+            "DiskBalancer info version is missing"),
+        Arguments.of(validYaml()
+            .replace("operationalState: RUNNING\n", ""),
+            "DiskBalancer operationalState is missing"),
+        Arguments.of(validYaml()
+            .replace("threshold: 10.0\n", "threshold: 0.0\n"),

Review Comment:
   Thanks for the suggestion! I added zero-value YAML validation cases for both 
`bandwidth` and `parallelThread`, covering the same persisted configuration 
validation path as `threshold`.



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