| 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.Map.Entry; |
| |
| import org.apache.accumulo.core.client.Scanner; |
| import org.apache.accumulo.core.client.mapreduce.AbstractInputFormat; |
| import org.apache.accumulo.core.client.mapreduce.RangeInputSplit; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| import org.apache.rya.accumulo.AccumuloRdfConfiguration; |
| import org.apache.rya.api.RdfCloudTripleStoreConstants.TABLE_LAYOUT; |
| import org.apache.rya.api.domain.RyaStatement; |
| import org.apache.rya.api.resolver.RyaTripleContext; |
| import org.apache.rya.api.resolver.triple.TripleRow; |
| import org.apache.rya.api.resolver.triple.TripleRowResolverException; |
| |
| /** |
| * Subclass of {@link AbstractInputFormat} for reading |
| * {@link RyaStatementWritable}s directly from a running Rya instance. |
| */ |
| public class RyaInputFormat extends AbstractInputFormat<Text, RyaStatementWritable> { |
| /** |
| * 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<Text, RyaStatementWritable> createRecordReader(InputSplit split, TaskAttemptContext context) { |
| return new RyaStatementRecordReader(); |
| } |
| |
| /** |
| * Sets the table layout to use. |
| * @param conf Configuration to set the layout in. |
| * @param layout Statements will be read from the Rya table associated |
| * with this layout. |
| */ |
| public static void setTableLayout(Job conf, TABLE_LAYOUT layout) { |
| conf.getConfiguration().set(MRUtils.TABLE_LAYOUT_PROP, layout.name()); |
| } |
| |
| /** |
| * Retrieves RyaStatementWritable objects from Accumulo tables. |
| */ |
| public class RyaStatementRecordReader extends AbstractRecordReader<Text, RyaStatementWritable> { |
| private RyaTripleContext ryaContext; |
| private TABLE_LAYOUT tableLayout; |
| |
| @Override |
| protected void setupIterators(TaskAttemptContext context, Scanner scanner, String tableName, |
| RangeInputSplit split) { |
| } |
| |
| /** |
| * 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); |
| this.tableLayout = MRUtils.getTableLayout(attempt.getConfiguration(), TABLE_LAYOUT.OSP); |
| //TODO verify that this is correct |
| this.ryaContext = RyaTripleContext.getInstance(new AccumuloRdfConfiguration(attempt.getConfiguration())); |
| } |
| |
| /** |
| * 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. |
| */ |
| public void initialize(InputSplit inSplit, TaskAttemptContext attempt, RyaTripleContext context, TABLE_LAYOUT tableLayout) throws IOException { |
| super.initialize(inSplit, attempt); |
| this.tableLayout = tableLayout; |
| //TODO verify that this is correct |
| this.ryaContext = context; |
| } |
| |
| /** |
| * 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 { |
| currentK = currentKey.getRow(); |
| RyaStatement stmt = this.ryaContext.deserializeTriple(this.tableLayout, |
| new TripleRow(entry.getKey().getRow().getBytes(), |
| entry.getKey().getColumnFamily().getBytes(), |
| entry.getKey().getColumnQualifier().getBytes(), |
| entry.getKey().getTimestamp(), |
| entry.getKey().getColumnVisibility().getBytes(), |
| entry.getValue().get())); |
| RyaStatementWritable writable = new RyaStatementWritable(); |
| writable.setRyaStatement(stmt); |
| currentV = writable; |
| } catch(TripleRowResolverException e) { |
| throw new IOException(e); |
| } |
| return true; |
| } |
| } |
| } |