| /* |
| * 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.tinkerpop.gremlin.spark.structure.io; |
| |
| import org.apache.commons.configuration.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.mapreduce.OutputFormat; |
| import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat; |
| import org.apache.spark.api.java.JavaPairRDD; |
| import org.apache.tinkerpop.gremlin.hadoop.Constants; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.ObjectWritable; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.ObjectWritableIterator; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.VertexWritable; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.util.ConfUtil; |
| import org.apache.tinkerpop.gremlin.process.computer.KeyValue; |
| import scala.Tuple2; |
| |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.Iterator; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class OutputFormatRDD implements OutputRDD { |
| |
| @Override |
| public void writeGraphRDD(final Configuration configuration, final JavaPairRDD<Object, VertexWritable> graphRDD) { |
| final org.apache.hadoop.conf.Configuration hadoopConfiguration = ConfUtil.makeHadoopConfiguration(configuration); |
| final String outputLocation = hadoopConfiguration.get(Constants.GREMLIN_HADOOP_OUTPUT_LOCATION); |
| if (null != outputLocation) { |
| // map back to a <nullwritable,vertexwritable> stream for output |
| graphRDD.mapToPair(tuple -> new Tuple2<>(NullWritable.get(), tuple._2())) |
| .saveAsNewAPIHadoopFile(Constants.getGraphLocation(outputLocation), |
| NullWritable.class, |
| VertexWritable.class, |
| (Class<OutputFormat<NullWritable, VertexWritable>>) hadoopConfiguration.getClass(Constants.GREMLIN_HADOOP_GRAPH_WRITER, OutputFormat.class), hadoopConfiguration); |
| } |
| } |
| |
| @Override |
| public <K, V> Iterator<KeyValue<K, V>> writeMemoryRDD(final Configuration configuration, final String memoryKey, JavaPairRDD<K, V> memoryRDD) { |
| final org.apache.hadoop.conf.Configuration hadoopConfiguration = ConfUtil.makeHadoopConfiguration(configuration); |
| final String outputLocation = hadoopConfiguration.get(Constants.GREMLIN_HADOOP_OUTPUT_LOCATION); |
| if (null != outputLocation) { |
| // map back to a Hadoop stream for output |
| memoryRDD.mapToPair(keyValue -> new Tuple2<>(new ObjectWritable<>(keyValue._1()), new ObjectWritable<>(keyValue._2()))) |
| .saveAsNewAPIHadoopFile(Constants.getMemoryLocation(outputLocation, memoryKey), |
| ObjectWritable.class, |
| ObjectWritable.class, |
| SequenceFileOutputFormat.class, hadoopConfiguration); |
| try { |
| return (Iterator) new ObjectWritableIterator(hadoopConfiguration, new Path(Constants.getMemoryLocation(outputLocation, memoryKey))); |
| } catch (final IOException e) { |
| throw new IllegalStateException(e.getMessage(), e); |
| } |
| } |
| return Collections.emptyIterator(); |
| } |
| } |