@Override public void close() throws IOException {
        synchronized (HBASE_TABLE_MONITOR) {
          recordReader.close();
          closeTable();
          conn.close();
        }
      }
HiveHBaseTableInputFormat implements InputFormat for HBase storage handler
tables, decorating an underlying HBase TableInputFormat with extra Hive logic
such as column pruning and filter pushdown.
hbase-handler/src/java/org/apache/hadoop/hive/hbase/HiveHBaseTableInputFormat.java