| /* |
| * 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.hadoop.structure.io; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.io.compress.CompressionCodec; |
| import org.apache.hadoop.io.compress.DefaultCodec; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; |
| import org.apache.hadoop.util.ReflectionUtils; |
| import org.apache.tinkerpop.gremlin.hadoop.process.computer.PersistResultGraphAware; |
| import org.apache.tinkerpop.gremlin.process.computer.GraphComputer; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public abstract class CommonFileOutputFormat extends FileOutputFormat<NullWritable, VertexWritable> implements PersistResultGraphAware { |
| |
| protected DataOutputStream getDataOutputStream(final TaskAttemptContext job) throws IOException, InterruptedException { |
| final Configuration conf = job.getConfiguration(); |
| boolean isCompressed = getCompressOutput(job); |
| CompressionCodec codec = null; |
| String extension = ""; |
| if (isCompressed) { |
| final Class<? extends CompressionCodec> codecClass = getOutputCompressorClass(job, DefaultCodec.class); |
| codec = ReflectionUtils.newInstance(codecClass, conf); |
| extension = codec.getDefaultExtension(); |
| } |
| final Path file = super.getDefaultWorkFile(job, extension); |
| final FileSystem fs = file.getFileSystem(conf); |
| if (!isCompressed) { |
| return new DataOutputStream(fs.create(file, false)); |
| } else { |
| return new DataOutputStream(codec.createOutputStream(fs.create(file, false))); |
| } |
| } |
| |
| @Override |
| public boolean supportsResultGraphPersistCombination(final GraphComputer.ResultGraph resultGraph, final GraphComputer.Persist persist) { |
| return persist.equals(GraphComputer.Persist.NOTHING) || resultGraph.equals(GraphComputer.ResultGraph.NEW); |
| } |
| } |