public void initialize() throws IOException {
    String ongoingBackupId = this.getOngoingBackupId();
    if (ongoingBackupId != null) {
      LOG.info("There is a ongoing backup {}"
        + ". Can not launch new backup until no ongoing backup remains.", ongoingBackupId);
      throw new BackupException("There is ongoing backup seesion.");
    }
  }
Start the backup manager service.
@throws IOException exception
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupManager.java