default void appendAll(List<ExtendedCell> cellList) throws IOException {
    for (ExtendedCell cell : cellList) {
      append(cell);
    }
  }
Append the given (possibly partial) list of cells of a row
@param cellList the cell list to be added
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CellSink.java