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/tags/release-0.0.0-rc0/hive/external/ql/src/java/org/apache/hadoop/hive/ql/io/DefaultHivePartitioner.java

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Java | 31 lines | 7 code | 5 blank | 19 comment | 0 complexity | ddef550c73761a04e907e6c405837b37 MD5 | raw file
 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
19package org.apache.hadoop.hive.ql.io;
20
21import org.apache.hadoop.mapred.lib.HashPartitioner;
22
23/** Partition keys by their {@link Object#hashCode()}. */
24public class DefaultHivePartitioner<K2, V2> extends HashPartitioner<K2, V2> implements HivePartitioner<K2, V2> {
25
26  /** Use {@link Object#hashCode()} to partition. */
27  public int getBucket(K2 key, V2 value, int numBuckets) {
28    return (key.hashCode() & Integer.MAX_VALUE) % numBuckets;
29  }
30
31}