public static Path getBackupTmpDirPathForBackupId(String backupRoot, String backupId) {
    return new Path(getBackupTmpDirPath(backupRoot), backupId);
  }
Get backup tmp directory for backupId
@param backupRoot backup root
@param backupId   backup id
@return backup tmp directory path
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/HBackupFileSystem.java