@Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    DatasetVersionRecord record = (DatasetVersionRecord) o;
    return accountId == record.accountId && containerId == record.containerId && Objects.equals(datasetName,
        record.datasetName) && Objects.equals(version, record.version) && expirationTimeMs == record.expirationTimeMs
        && Objects.equals(creationTimeMs, record.creationTimeMs) && Objects.equals(renameFrom, record.renameFrom);
  }
@return the creation time of the dataset version.
ambry-api/src/main/java/com/github/ambry/account/DatasetVersionRecord.java