public static String getTimestampFromFile(String filename) {
    return filename.split("\\.")[0];
  }
@Test
  public void testGetTimestamp() {
    Assertions.assertTrue(HoodieConsistentHashingMetadata.getTimestampFromFile("0000.hashing_metadata").equals("0000"));
    Assertions.assertTrue(HoodieConsistentHashingMetadata.getTimestampFromFile("1234.hashing_metadata").equals("1234"));
  }