HashPartitioner.java
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- /**
- * 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.mapred.lib;
- import org.apache.hadoop.mapred.Partitioner;
- import org.apache.hadoop.mapred.JobConf;
- /** Partition keys by their {@link Object#hashCode()}.
- * @deprecated Use
- * {@link org.apache.hadoop.mapreduce.lib.partition.HashPartitioner} instead.
- */
- @Deprecated
- public class HashPartitioner<K2, V2> implements Partitioner<K2, V2> {
- public void configure(JobConf job) {}
- /** Use {@link Object#hashCode()} to partition. */
- public int getPartition(K2 key, V2 value,
- int numReduceTasks) {
- return (key.hashCode() & Integer.MAX_VALUE) % numReduceTasks;
- }
- }