1 /**
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19 package org.apache.hadoop.hbase.mob.mapreduce;
20
21 import org.apache.hadoop.hbase.classification.InterfaceAudience;
22 import org.apache.hadoop.hbase.KeyValue;
23 import org.apache.hadoop.hbase.mob.MobFileName;
24 import org.apache.hadoop.io.Text;
25 import org.apache.hadoop.mapreduce.Partitioner;
26
27 /**
28 * The partitioner for the sweep job.
29 * The key is a mob file name. We bucket by date.
30 */
31 @InterfaceAudience.Private
32 public class MobFilePathHashPartitioner extends Partitioner<Text, KeyValue> {
33
34 @Override
35 public int getPartition(Text fileName, KeyValue kv, int numPartitions) {
36 MobFileName mobFileName = MobFileName.create(fileName.toString());
37 String date = mobFileName.getDate();
38 int hash = date.hashCode();
39 return (hash & Integer.MAX_VALUE) % numPartitions;
40 }
41 }