| /** |
| * Copyright 2010 The Apache Software Foundation |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.mapreduce; |
| |
| import java.util.List; |
| import java.util.TreeSet; |
| |
| import org.apache.hadoop.hbase.KeyValue; |
| import org.apache.hadoop.hbase.client.Put; |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.hadoop.mapreduce.Reducer; |
| |
| /** |
| * Emits sorted Puts. |
| * Reads in all Puts from passed Iterator, sorts them, then emits |
| * Puts in sorted order. If lots of columns per row, it will use lots of |
| * memory sorting. |
| * @see HFileOutputFormat |
| * @see KeyValueSortReducer |
| */ |
| public class PutSortReducer extends |
| Reducer<ImmutableBytesWritable, Put, ImmutableBytesWritable, KeyValue> { |
| |
| @Override |
| protected void reduce( |
| ImmutableBytesWritable row, |
| java.lang.Iterable<Put> puts, |
| Reducer<ImmutableBytesWritable, Put, |
| ImmutableBytesWritable, KeyValue>.Context context) |
| throws java.io.IOException, InterruptedException |
| { |
| TreeSet<KeyValue> map = new TreeSet<KeyValue>(KeyValue.COMPARATOR); |
| |
| for (Put p : puts) { |
| for (List<KeyValue> kvs : p.getFamilyMap().values()) { |
| for (KeyValue kv : kvs) { |
| map.add(kv.clone()); |
| } |
| } |
| } |
| context.setStatus("Read " + map.getClass()); |
| int index = 0; |
| for (KeyValue kv : map) { |
| context.write(row, kv); |
| if (index > 0 && index % 100 == 0) |
| context.setStatus("Wrote " + index); |
| } |
| } |
| } |