| /** |
| * 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.crunch.lib.join; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.generic.IndexedRecord; |
| import org.apache.avro.io.BinaryData; |
| import org.apache.avro.mapred.AvroJob; |
| import org.apache.avro.mapred.AvroKey; |
| import org.apache.avro.mapred.AvroValue; |
| import org.apache.avro.mapred.AvroWrapper; |
| import org.apache.avro.reflect.ReflectData; |
| import org.apache.crunch.types.PTypeFamily; |
| import org.apache.crunch.types.avro.AvroMode; |
| import org.apache.crunch.types.writable.TupleWritable; |
| import org.apache.crunch.types.writable.WritableTypeFamily; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.conf.Configured; |
| import org.apache.hadoop.io.DataInputBuffer; |
| import org.apache.hadoop.io.RawComparator; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.mapreduce.Partitioner; |
| |
| /** |
| * Utilities that are useful in joining multiple data sets via a MapReduce. |
| * |
| */ |
| public class JoinUtils { |
| |
| public static Class<? extends Partitioner> getPartitionerClass(PTypeFamily typeFamily) { |
| if (typeFamily == WritableTypeFamily.getInstance()) { |
| return TupleWritablePartitioner.class; |
| } else { |
| return AvroIndexedRecordPartitioner.class; |
| } |
| } |
| |
| public static Class<? extends RawComparator> getGroupingComparator(PTypeFamily typeFamily) { |
| if (typeFamily == WritableTypeFamily.getInstance()) { |
| return TupleWritableComparator.class; |
| } else { |
| return AvroPairGroupingComparator.class; |
| } |
| } |
| |
| public static class TupleWritablePartitioner extends Partitioner<TupleWritable, Writable> { |
| @Override |
| public int getPartition(TupleWritable key, Writable value, int numPartitions) { |
| return (key.get(0).hashCode() & Integer.MAX_VALUE) % numPartitions; |
| } |
| } |
| |
| public static class TupleWritableComparator implements RawComparator<TupleWritable> { |
| |
| private DataInputBuffer buffer = new DataInputBuffer(); |
| private TupleWritable key1 = new TupleWritable(); |
| private TupleWritable key2 = new TupleWritable(); |
| |
| @Override |
| public int compare(TupleWritable o1, TupleWritable o2) { |
| return ((Comparable) o1.get(0)).compareTo(o2.get(0)); |
| } |
| |
| @Override |
| public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { |
| try { |
| buffer.reset(b1, s1, l1); |
| key1.readFields(buffer); |
| |
| buffer.reset(b2, s2, l2); |
| key2.readFields(buffer); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| |
| return compare(key1, key2); |
| } |
| } |
| |
| public static class AvroIndexedRecordPartitioner extends Partitioner<Object, Object> { |
| @Override |
| public int getPartition(Object key, Object value, int numPartitions) { |
| IndexedRecord record; |
| if (key instanceof AvroWrapper) { |
| record = (IndexedRecord) ((AvroWrapper) key).datum(); |
| } else if (key instanceof IndexedRecord) { |
| record = (IndexedRecord) key; |
| } else { |
| throw new UnsupportedOperationException("Unknown avro key type: " + key); |
| } |
| return (record.get(0).hashCode() & Integer.MAX_VALUE) % numPartitions; |
| } |
| } |
| |
| public static class AvroPairGroupingComparator<T> extends Configured implements RawComparator<AvroWrapper<T>> { |
| private Schema schema; |
| private AvroMode mode; |
| |
| @Override |
| public void setConf(Configuration conf) { |
| super.setConf(conf); |
| if (conf != null) { |
| Schema mapOutputSchema = AvroJob.getMapOutputSchema(conf); |
| Schema keySchema = org.apache.avro.mapred.Pair.getKeySchema(mapOutputSchema); |
| schema = keySchema.getFields().get(0).schema(); |
| mode = AvroMode.fromShuffleConfiguration(conf); |
| } |
| } |
| |
| @Override |
| public int compare(AvroWrapper<T> x, AvroWrapper<T> y) { |
| return mode.getData().compare(x.datum(), y.datum(), schema); |
| } |
| |
| @Override |
| public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { |
| return BinaryData.compare(b1, s1, l1, b2, s2, l2, schema); |
| } |
| } |
| } |