public static Path getMobRegionPath(Path rootDir, TableName tableName) {
    Path tablePath = CommonFSUtils.getTableDir(getMobHome(rootDir), tableName);
    RegionInfo regionInfo = getMobRegionInfo(tableName);
    return new Path(tablePath, regionInfo.getEncodedName());
  }
Gets the region dir of the mob files under the specified root dir. It's
{rootDir}/mobdir/data/{namespace}/{tableName}/{regionEncodedName}.
@param rootDir   The qualified path of HBase root directory.
@param tableName The current table name.
@return The region dir of the mob files.
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobUtils.java