public static Path getMobRegionPath(Configuration conf, TableName tableName) {
    return getMobRegionPath(new Path(conf.get(HConstants.HBASE_DIR)), tableName);
  }
Gets the region dir of the mob files. It's
{HBASE_DIR}/mobdir/data/{namespace}/{tableName}/{regionEncodedName}.
@param conf      The current configuration.
@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