apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/message/ReleaseMessageScanner.java/ReleaseMessageScanner/loadLargestMessageId
class ReleaseMessageScanner:  private long loadLargestMessageId() {
    ReleaseMessage releaseMessage = releaseMessageRepository.findTopByOrderByIdDesc();
    return releaseMessage == null ? 0 : releaseMessage.getId();
  }