public static Path getMobHome(Configuration conf) {
    Path hbaseDir = new Path(conf.get(HConstants.HBASE_DIR));
    return getMobHome(hbaseDir);
  }
Gets the root dir of the mob files. It's {HBASE_DIR}/mobdir.
@param conf The current configuration.
@return the root dir of the mob file.
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobUtils.java