| /* |
| * 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.hadoop.io.NullWritable; |
| import org.apache.hadoop.mapreduce.InputFormat; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.spark.SparkConf; |
| import org.apache.spark.SparkContext; |
| import org.apache.spark.api.java.JavaSparkContext; |
| import org.apache.tinkerpop.gremlin.hadoop.Constants; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.VertexWritable; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.util.ConfUtil; |
| import org.apache.tinkerpop.gremlin.spark.structure.Spark; |
| import scala.Tuple2; |
| |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.UUID; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class InputRDDFormat extends InputFormat<NullWritable, VertexWritable> { |
| |
| public InputRDDFormat() { |
| |
| } |
| |
| @Override |
| public List<InputSplit> getSplits(final JobContext jobContext) throws IOException, InterruptedException { |
| return Collections.singletonList(new InputSplit() { |
| @Override |
| public long getLength() throws IOException, InterruptedException { |
| return 0; |
| } |
| |
| @Override |
| public String[] getLocations() throws IOException, InterruptedException { |
| return new String[0]; |
| } |
| }); |
| } |
| |
| @Override |
| public RecordReader<NullWritable, VertexWritable> createRecordReader(final InputSplit inputSplit, final TaskAttemptContext taskAttemptContext) throws IOException, InterruptedException { |
| try { |
| final org.apache.hadoop.conf.Configuration hadoopConfiguration = taskAttemptContext.getConfiguration(); |
| final SparkConf sparkConfiguration = new SparkConf(); |
| sparkConfiguration.setAppName(UUID.randomUUID().toString()); |
| hadoopConfiguration.forEach(entry -> sparkConfiguration.set(entry.getKey(), entry.getValue())); |
| final InputRDD inputRDD = (InputRDD) Class.forName(sparkConfiguration.get(Constants.GREMLIN_HADOOP_GRAPH_READER)).newInstance(); |
| final JavaSparkContext javaSparkContext = new JavaSparkContext(SparkContext.getOrCreate(sparkConfiguration)); |
| Spark.create(javaSparkContext.sc()); |
| final Iterator<Tuple2<Object, VertexWritable>> iterator = inputRDD.readGraphRDD(ConfUtil.makeApacheConfiguration(taskAttemptContext.getConfiguration()), javaSparkContext).toLocalIterator(); |
| return new RecordReader<NullWritable, VertexWritable>() { |
| @Override |
| public void initialize(final InputSplit inputSplit, final TaskAttemptContext taskAttemptContext) throws IOException, InterruptedException { |
| |
| } |
| |
| @Override |
| public boolean nextKeyValue() throws IOException, InterruptedException { |
| return iterator.hasNext(); |
| } |
| |
| @Override |
| public NullWritable getCurrentKey() throws IOException, InterruptedException { |
| return NullWritable.get(); |
| } |
| |
| @Override |
| public VertexWritable getCurrentValue() throws IOException, InterruptedException { |
| return iterator.next()._2(); |
| } |
| |
| @Override |
| public float getProgress() throws IOException, InterruptedException { |
| return 1.0f; // TODO: make this dynamic (how? its an iterator.) |
| } |
| |
| @Override |
| public void close() throws IOException { |
| |
| } |
| }; |
| } catch (final ClassNotFoundException | InstantiationException | IllegalAccessException e) { |
| throw new IOException(e.getMessage(), e); |
| } |
| |
| } |
| |
| /*private static class PartitionInputSplit extends InputSplit { |
| |
| private final Partition partition; |
| |
| public PartitionInputSplit(final Partition partition) { |
| this.partition = partition; |
| } |
| |
| @Override |
| public long getLength() throws IOException, InterruptedException { |
| return 0; |
| } |
| |
| @Override |
| public String[] getLocations() throws IOException, InterruptedException { |
| return new String[0]; |
| } |
| |
| public Partition getPartition() { |
| return this.partition; |
| } |
| }*/ |
| } |