[ 
https://issues.apache.org/jira/browse/HDFS-16437?focusedWorklogId=720042&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-720042
 ]

ASF GitHub Bot logged work on HDFS-16437:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/Feb/22 11:28
            Start Date: 03/Feb/22 11:28
    Worklog Time Spent: 10m 
      Work Description: jojochuang commented on a change in pull request #3926:
URL: https://github.com/apache/hadoop/pull/3926#discussion_r798469503



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewer.java
##########
@@ -1174,6 +1174,44 @@ public void testReverseXmlWrongLayoutVersion() throws 
Throwable {
     }
   }
 
+  /**
+   * Tests that the ReverseXML processor doesn't accept XML files without the 
SnapshotDiffSection.
+   */
+  @Test
+  public void testReverseXmlWithoutSnapshotDiffSection() throws Throwable {
+    File imageWSDS = new File(tempDir, "imageWithoutSnapshotDiffSection.xml");
+    try(PrintWriter writer = new PrintWriter(imageWSDS, "UTF-8")) {
+      writer.println("<?xml version=\"1.0\"?>");
+      writer.println("<fsimage>");
+      writer.println("<version>");
+      writer.println("<layoutVersion>-67</layoutVersion>");
+      writer.println("<onDiskVersion>1</onDiskVersion>");
+      
writer.println("<oivRevision>545bbef596c06af1c3c8dca1ce29096a64608478</oivRevision>");
+      writer.println("</version>");
+      
writer.println("<FileUnderConstructionSection></FileUnderConstructionSection>");
+      writer.println("<ErasureCodingSection></ErasureCodingSection>");
+      
writer.println("<INodeSection><lastInodeId>91488</lastInodeId><numInodes>0</numInodes>"
 +
+              "</INodeSection>");
+      
writer.println("<SecretManagerSection><currentId>90</currentId><tokenSequenceNumber>35"
 +
+              
"</tokenSequenceNumber><numDelegationKeys>0</numDelegationKeys><numTokens>0" +
+              "</numTokens></SecretManagerSection>");
+      writer.println("<INodeReferenceSection></INodeReferenceSection>");
+      
writer.println("<SnapshotSection><snapshotCounter>0</snapshotCounter><numSnapshots>0"
 +
+              "</numSnapshots></SnapshotSection>");
+      
writer.println("<NameSection><namespaceId>326384987</namespaceId></NameSection>");
+      
writer.println("<CacheManagerSection><nextDirectiveId>1</nextDirectiveId><numPools>0"
 +
+              
"</numPools><numDirectives>0</numDirectives></CacheManagerSection>");
+      writer.println("<INodeDirectorySection></INodeDirectorySection>");
+      writer.println("</fsimage>");
+    }
+    try {
+      OfflineImageReconstructor.run(imageWSDS.getAbsolutePath(),
+              imageWSDS.getAbsolutePath() + ".out");
+    } catch (Throwable t) {
+      GenericTestUtils.assertExceptionContains("without SnapshotDiffSection.", 
t);
+    }
+  }
+

Review comment:
       Please just remove the try..catch block, and let it run. The test has to 
fail when it throws an exception. It doesn't matter what exception it throws.
   ```suggestion
     OfflineImageReconstructor.run(imageWSDS.getAbsolutePath(),
                   imageWSDS.getAbsolutePath() + ".out");
   ```




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 720042)
    Time Spent: 3h 50m  (was: 3h 40m)

> ReverseXML processor doesn't accept XML files without the SnapshotDiffSection.
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-16437
>                 URL: https://issues.apache.org/jira/browse/HDFS-16437
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 3.1.1, 3.3.0
>            Reporter: yanbin.zhang
>            Priority: Critical
>              Labels: pull-request-available
>          Time Spent: 3h 50m
>  Remaining Estimate: 0h
>
> In a cluster environment without snapshot, if you want to convert back to 
> fsimage through the generated xml, an error will be reported.
> {code:java}
> //代码占位符
> [test@test001 ~]$ hdfs oiv -p ReverseXML -i fsimage_0000000000000257220.xml 
> -o fsimage_0000000000000257220
> OfflineImageReconstructor failed: FSImage XML ended prematurely, without 
> including section(s) SnapshotDiffSection
> java.io.IOException: FSImage XML ended prematurely, without including 
> section(s) SnapshotDiffSection
>         at 
> org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageReconstructor.processXml(OfflineImageReconstructor.java:1765)
>         at 
> org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageReconstructor.run(OfflineImageReconstructor.java:1842)
>         at 
> org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewerPB.run(OfflineImageViewerPB.java:211)
>         at 
> org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewerPB.main(OfflineImageViewerPB.java:149)
> 22/01/25 15:56:52 INFO util.ExitUtil: Exiting with status 1: ExitException 
> {code}



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