/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/io/DefaultHivePartitioner.java

/**
 * 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.hive.ql.io;

import org.apache.hadoop.mapred.lib.HashPartitioner;

/** Partition keys by their {@link Object#hashCode()}. */
public class DefaultHivePartitioner<K2, V2> extends HashPartitioner<K2, V2> implements HivePartitioner<K2, V2> {

  /** Use {@link Object#hashCode()} to partition. */
  public int getBucket(K2 key, V2 value, int numBuckets) {
    return (key.hashCode() & Integer.MAX_VALUE) % numBuckets;
  }

}