| package org.apache.rya.accumulo.mr; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Map.Entry; |
| |
| import org.apache.rya.api.domain.RyaType; |
| import org.apache.rya.api.resolver.RyaTypeResolverException; |
| import org.apache.rya.indexing.accumulo.entity.EntityCentricIndex; |
| |
| import org.apache.accumulo.core.client.IteratorSetting; |
| import org.apache.accumulo.core.client.Scanner; |
| import org.apache.accumulo.core.client.mapreduce.InputFormatBase; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.core.iterators.user.WholeRowIterator; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| public class GraphXInputFormat extends InputFormatBase<Object, RyaTypeWritable> { |
| |
| private static final int WHOLE_ROW_ITERATOR_PRIORITY = 23; |
| |
| /** |
| * Instantiates a RecordReader for this InputFormat and a given task and |
| * input split. |
| * |
| * @param split |
| * Defines the portion of the input this RecordReader is |
| * responsible for. |
| * @param context |
| * The context of the task. |
| * @return A RecordReader that can be used to fetch RyaStatementWritables. |
| */ |
| @Override |
| public RecordReader<Object, RyaTypeWritable> createRecordReader( |
| InputSplit split, TaskAttemptContext context) { |
| return new RyaStatementRecordReader(); |
| } |
| |
| |
| |
| /** |
| * Retrieves RyaStatementWritable objects from Accumulo tables. |
| */ |
| public class RyaStatementRecordReader extends |
| AbstractRecordReader<Object, RyaTypeWritable> { |
| protected void setupIterators(TaskAttemptContext context, |
| Scanner scanner, String tableName, |
| @SuppressWarnings("deprecation") RangeInputSplit split) { |
| IteratorSetting iteratorSetting = new IteratorSetting( |
| WHOLE_ROW_ITERATOR_PRIORITY, WholeRowIterator.class); |
| scanner.addScanIterator(iteratorSetting); |
| } |
| |
| /** |
| * Initializes the RecordReader. |
| * |
| * @param inSplit |
| * Defines the portion of data to read. |
| * @param attempt |
| * Context for this task attempt. |
| * @throws IOException |
| * if thrown by the superclass's initialize method. |
| */ |
| @Override |
| public void initialize(InputSplit inSplit, TaskAttemptContext attempt) |
| throws IOException { |
| super.initialize(inSplit, attempt); |
| } |
| |
| /** |
| * Load the next statement by converting the next Accumulo row to a |
| * statement, and make the new (key,value) pair available for retrieval. |
| * |
| * @return true if another (key,value) pair was fetched and is ready to |
| * be retrieved, false if there was none. |
| * @throws IOException |
| * if a row was loaded but could not be converted to a |
| * statement. |
| */ |
| @Override |
| public boolean nextKeyValue() throws IOException { |
| if (!scannerIterator.hasNext()) |
| return false; |
| Entry<Key, Value> entry = scannerIterator.next(); |
| ++numKeysRead; |
| currentKey = entry.getKey(); |
| |
| try { |
| RyaType type = EntityCentricIndex.getRyaType(currentKey, entry.getValue()); |
| RyaTypeWritable writable = new RyaTypeWritable(); |
| writable.setRyaType(type); |
| currentK = GraphXEdgeInputFormat.getVertexId(type); |
| currentV = writable; |
| } catch (RyaTypeResolverException e) { |
| throw new IOException(); |
| } |
| return true; |
| } |
| |
| protected List<IteratorSetting> contextIterators( |
| TaskAttemptContext context, String tableName) { |
| return getIterators(context); |
| } |
| |
| @Override |
| protected void setupIterators(TaskAttemptContext context, |
| Scanner scanner, String tableName, |
| org.apache.accumulo.core.client.mapreduce.RangeInputSplit split) { |
| |
| List<IteratorSetting> iterators = null; |
| |
| if (null == split) { |
| iterators = contextIterators(context, tableName); |
| } else { |
| iterators = split.getIterators(); |
| if (null == iterators) { |
| iterators = contextIterators(context, tableName); |
| } |
| } |
| |
| for (IteratorSetting iterator : iterators) |
| scanner.addScanIterator(iterator); |
| } |
| } |
| } |