1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 package org.apache.hadoop.chukwa.extraction.archive;
20
21
22 import java.text.SimpleDateFormat;
23 import org.apache.hadoop.chukwa.ChukwaArchiveKey;
24 import org.apache.hadoop.chukwa.ChunkImpl;
25 import org.apache.hadoop.mapred.JobConf;
26 import org.apache.hadoop.mapred.Partitioner;
27
28 public class ChukwaArchiveHourlyPartitioner<K, V> implements
29 Partitioner<ChukwaArchiveKey, ChunkImpl> {
30 SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd_HH-00");
31
32 public void configure(JobConf arg0) {
33 }
34
35 public int getPartition(ChukwaArchiveKey key, ChunkImpl chunl,
36 int numReduceTasks) {
37
38 return (sdf.format(key.getTimePartition()).hashCode() & Integer.MAX_VALUE)
39 % numReduceTasks;
40 }
41
42 }