| 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.nio.charset.StandardCharsets; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.List; |
| import java.util.Map.Entry; |
| |
| import org.apache.accumulo.core.client.IteratorSetting; |
| import org.apache.accumulo.core.client.Scanner; |
| import org.apache.accumulo.core.client.mapreduce.AbstractInputFormat; |
| 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.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.domain.RyaType; |
| import org.apache.rya.api.resolver.RyaTripleContext; |
| import org.apache.rya.api.resolver.triple.TripleRow; |
| import org.apache.rya.api.resolver.triple.TripleRowResolverException; |
| import org.apache.spark.graphx.Edge; |
| |
| /** |
| * Subclass of {@link AbstractInputFormat} for reading |
| * {@link RyaStatementWritable}s directly from a running Rya instance. |
| */ |
| @SuppressWarnings("rawtypes") |
| public class GraphXEdgeInputFormat extends InputFormatBase<Object, Edge> { |
| /** |
| * 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, Edge> createRecordReader(final InputSplit split, |
| final 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(final Job conf, final TABLE_LAYOUT layout) { |
| conf.getConfiguration().set(MRUtils.TABLE_LAYOUT_PROP, layout.name()); |
| } |
| |
| /** |
| * Retrieves RyaStatementWritable objects from Accumulo tables. |
| */ |
| public class RyaStatementRecordReader extends |
| AbstractRecordReader<Object, Edge> { |
| private RyaTripleContext ryaContext; |
| private TABLE_LAYOUT tableLayout; |
| |
| protected void setupIterators(final TaskAttemptContext context, |
| final Scanner scanner, final String tableName, final 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(final InputSplit inSplit, final TaskAttemptContext attempt) |
| throws IOException { |
| super.initialize(inSplit, attempt); |
| this.tableLayout = MRUtils.getTableLayout( |
| attempt.getConfiguration(), TABLE_LAYOUT.SPO); |
| // TODO verify that this is correct |
| this.ryaContext = RyaTripleContext |
| .getInstance(new AccumuloRdfConfiguration(attempt |
| .getConfiguration())); |
| } |
| |
| /** |
| * 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; |
| } |
| final Entry<Key, Value> entry = scannerIterator.next(); |
| ++numKeysRead; |
| currentKey = entry.getKey(); |
| try { |
| currentK = currentKey.getRow(); |
| final RyaTypeWritable rtw = new RyaTypeWritable(); |
| final 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())); |
| |
| final long subHash = getVertexId(stmt.getSubject()); |
| final long objHash = getVertexId(stmt.getObject()); |
| rtw.setRyaType(stmt.getPredicate()); |
| |
| final Edge<RyaTypeWritable> writable = new Edge<RyaTypeWritable>( |
| subHash, objHash, rtw); |
| currentV = writable; |
| } catch (final TripleRowResolverException e) { |
| throw new IOException(e); |
| } |
| return true; |
| } |
| |
| protected List<IteratorSetting> contextIterators( |
| final TaskAttemptContext context, final String tableName) { |
| return getIterators(context); |
| } |
| |
| @Override |
| protected void setupIterators(final TaskAttemptContext context, |
| final Scanner scanner, final String tableName, |
| final 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 (final IteratorSetting iterator : iterators) { |
| scanner.addScanIterator(iterator); |
| } |
| } |
| |
| } |
| |
| public static long getVertexId(final RyaType resource) throws IOException { |
| String iri = ""; |
| if (resource != null) { |
| iri = resource.getData().toString(); |
| } |
| try { |
| // SHA-256 the string value and then generate a hashcode from |
| // the digested string, the collision ratio is less than 0.0001% |
| // using custom hash function should significantly reduce the |
| // collision ratio |
| final MessageDigest messageDigest = MessageDigest |
| .getInstance("SHA-256"); |
| messageDigest.update(iri.getBytes(StandardCharsets.UTF_8)); |
| final String encryptedString = new String(messageDigest.digest(), StandardCharsets.UTF_8); |
| return hash(encryptedString); |
| } |
| catch (final NoSuchAlgorithmException e) { |
| throw new IOException(e); |
| } |
| } |
| |
| public static long hash(final String string) { |
| long h = 1125899906842597L; // prime |
| final int len = string.length(); |
| |
| for (int i = 0; i < len; i++) { |
| h = 31 * h + string.charAt(i); |
| } |
| return h; |
| } |
| } |