| /** |
| * 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.gora.mapreduce; |
| |
| import java.io.IOException; |
| import java.util.List; |
| |
| import org.apache.gora.util.StringUtils; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; |
| |
| /** |
| * MapReduce related utilities for Gora |
| */ |
| public class GoraMapReduceUtils { |
| |
| public static class HelperInputFormat<K,V> extends FileInputFormat<K, V> { |
| @Override |
| public RecordReader<K, V> createRecordReader(InputSplit arg0, |
| TaskAttemptContext arg1) throws IOException, InterruptedException { |
| return null; |
| } |
| } |
| |
| public static void setIOSerializations(Configuration conf, boolean reuseObjects) { |
| String serializationClass = |
| PersistentSerialization.class.getCanonicalName(); |
| if (!reuseObjects) { |
| serializationClass = |
| PersistentNonReusingSerialization.class.getCanonicalName(); |
| } |
| String[] serializations = StringUtils.joinStringArrays( |
| conf.getStrings("io.serializations"), |
| "org.apache.hadoop.io.serializer.WritableSerialization", |
| StringSerialization.class.getCanonicalName(), |
| serializationClass); |
| conf.setStrings("io.serializations", serializations); |
| } |
| |
| public static List<InputSplit> getSplits(Configuration conf, String inputPath) |
| throws IOException { |
| JobContext context = createJobContext(conf, inputPath); |
| |
| HelperInputFormat<?,?> inputFormat = new HelperInputFormat<Object,Object>(); |
| return inputFormat.getSplits(context); |
| } |
| |
| public static JobContext createJobContext(Configuration conf, String inputPath) |
| throws IOException { |
| |
| if(inputPath != null) { |
| Job job = new Job(conf); |
| FileInputFormat.addInputPath(job, new Path(inputPath)); |
| return new JobContext(job.getConfiguration(), null); |
| } |
| |
| return new JobContext(conf, null); |
| } |
| } |