001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.mapreduce;
019
020import java.io.IOException;
021import org.apache.hadoop.hbase.Cell;
022import org.apache.hadoop.hbase.CellUtil;
023import org.apache.hadoop.hbase.PrivateCellUtil;
024import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
025import org.apache.hadoop.hbase.util.MapReduceExtendedCell;
026import org.apache.hadoop.mapreduce.Reducer;
027import org.apache.yetus.audience.InterfaceAudience;
028
029@InterfaceAudience.Private
030public class PreSortedCellsReducer
031  extends Reducer<KeyOnlyCellComparable, Cell, ImmutableBytesWritable, Cell> {
032
033  @Override
034  protected void reduce(KeyOnlyCellComparable keyComparable, Iterable<Cell> values, Context context)
035    throws IOException, InterruptedException {
036
037    int index = 0;
038    ImmutableBytesWritable key =
039      new ImmutableBytesWritable(CellUtil.cloneRow(keyComparable.getCell()));
040    for (Cell cell : values) {
041      context.write(key, new MapReduceExtendedCell(PrivateCellUtil.ensureExtendedCell(cell)));
042      if (++index % 100 == 0) {
043        context.setStatus("Wrote " + index + " cells");
044      }
045    }
046  }
047}