| /** |
| * 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.avro.mapred.tether; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.Partitioner; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.io.BinaryData; |
| import org.apache.avro.mapred.AvroJob; |
| |
| class TetherPartitioner implements Partitioner<TetherData, NullWritable> { |
| |
| private static final ThreadLocal<Integer> CACHE = new ThreadLocal<Integer>(); |
| |
| private Schema schema; |
| |
| public void configure(JobConf job) { |
| schema = AvroJob.getMapOutputSchema(job); |
| } |
| |
| static void setNextPartition(int newValue) { |
| CACHE.set(newValue); |
| } |
| |
| public int getPartition(TetherData key, NullWritable value, |
| int numPartitions) { |
| Integer result = CACHE.get(); |
| if (result != null) // return cached value |
| return result; |
| |
| ByteBuffer b = key.buffer(); |
| int p = b.position(); |
| int hashCode = BinaryData.hashCode(b.array(), p, b.limit()-p, schema); |
| if (hashCode < 0) |
| hashCode = -hashCode; |
| return hashCode % numPartitions; |
| } |
| |
| } |