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}