nsivabalan commented on a change in pull request #2845:
URL: https://github.com/apache/hudi/pull/2845#discussion_r633631889



##########
File path: 
hudi-common/src/test/java/org/apache/hudi/common/testutils/FileCreateUtils.java
##########
@@ -219,13 +221,19 @@ public static void createBaseFile(String basePath, String 
partitionPath, String
 
   public static void createBaseFile(String basePath, String partitionPath, 
String instantTime, String fileId, long length)
       throws Exception {
+    createBaseFile(basePath, partitionPath, instantTime, fileId, length, 
Instant.now().toEpochMilli());
+  }
+
+  public static void createBaseFile(String basePath, String partitionPath, 
String instantTime, String fileId, long length, long lastModificationTimeMilli)
+      throws Exception {
     Path parentPath = Paths.get(basePath, partitionPath);
     Files.createDirectories(parentPath);
     Path baseFilePath = parentPath.resolve(baseFileName(instantTime, fileId));
     if (Files.notExists(baseFilePath)) {
       Files.createFile(baseFilePath);
     }
     new RandomAccessFile(baseFilePath.toFile(), "rw").setLength(length);
+    Files.setLastModifiedTime(baseFilePath, 
FileTime.fromMillis(lastModificationTimeMilli));

Review comment:
       may I know why we need to set mod time explicitly. I thought these are 
newly created files and so modificaiton time will be set to creation time and 
these are immutable files. can you help me understand. 




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