| /** |
| * 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.tez.mapreduce.partition; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.util.ReflectionUtils; |
| import org.apache.tez.common.TezJobConfig; |
| import org.apache.tez.mapreduce.hadoop.MRJobConfig; |
| import org.apache.tez.runtime.library.common.ConfigUtils; |
| |
| @SuppressWarnings({ "rawtypes", "unchecked" }) |
| public class MRPartitioner implements org.apache.tez.runtime.library.api.Partitioner { |
| |
| static final Log LOG = LogFactory.getLog(MRPartitioner.class); |
| |
| private final boolean useNewApi; |
| private int partitions = 1; |
| |
| private org.apache.hadoop.mapreduce.Partitioner newPartitioner; |
| private org.apache.hadoop.mapred.Partitioner oldPartitioner; |
| |
| public MRPartitioner(Configuration conf) { |
| this.useNewApi = ConfigUtils.useNewApi(conf); |
| this.partitions = conf.getInt(TezJobConfig.TEZ_RUNTIME_NUM_EXPECTED_PARTITIONS, 1); |
| |
| if (useNewApi) { |
| if (partitions > 1) { |
| newPartitioner = (org.apache.hadoop.mapreduce.Partitioner) ReflectionUtils |
| .newInstance( |
| (Class<? extends org.apache.hadoop.mapreduce.Partitioner<?, ?>>) conf |
| .getClass(MRJobConfig.PARTITIONER_CLASS_ATTR, |
| org.apache.hadoop.mapreduce.lib.partition.HashPartitioner.class), conf); |
| } else { |
| newPartitioner = new org.apache.hadoop.mapreduce.Partitioner() { |
| @Override |
| public int getPartition(Object key, Object value, int numPartitions) { |
| return numPartitions - 1; |
| } |
| }; |
| } |
| } else { |
| if (partitions > 1) { |
| oldPartitioner = (org.apache.hadoop.mapred.Partitioner) ReflectionUtils.newInstance( |
| (Class<? extends org.apache.hadoop.mapred.Partitioner>) conf.getClass( |
| "mapred.partitioner.class", org.apache.hadoop.mapred.lib.HashPartitioner.class), conf); |
| } else { |
| oldPartitioner = new org.apache.hadoop.mapred.Partitioner() { |
| @Override |
| public void configure(JobConf job) { |
| } |
| |
| @Override |
| public int getPartition(Object key, Object value, int numPartitions) { |
| return numPartitions - 1; |
| } |
| }; |
| } |
| } |
| } |
| |
| @Override |
| public int getPartition(Object key, Object value, int numPartitions) { |
| if (useNewApi) { |
| return newPartitioner.getPartition(key, value, numPartitions); |
| } else { |
| return oldPartitioner.getPartition(key, value, numPartitions); |
| } |
| } |
| } |