org.apache.sysml.runtime.controlprogram.parfor.DataPartitionerRemoteSparkReducer.java Source code

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Here is the source code for org.apache.sysml.runtime.controlprogram.parfor.DataPartitionerRemoteSparkReducer.java

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/*
 * 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.sysml.runtime.controlprogram.parfor;

import java.io.File;
import java.util.Iterator;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Writable;
import org.apache.spark.api.java.function.VoidFunction;

import org.apache.sysml.conf.ConfigurationManager;
import org.apache.sysml.runtime.controlprogram.parfor.util.PairWritableBlock;
import org.apache.sysml.runtime.io.IOUtilFunctions;
import org.apache.sysml.runtime.matrix.data.MatrixBlock;
import org.apache.sysml.runtime.matrix.data.MatrixIndexes;
import org.apache.sysml.runtime.matrix.data.OutputInfo;
import org.apache.sysml.runtime.matrix.mapred.MRConfigurationNames;

import scala.Tuple2;

public class DataPartitionerRemoteSparkReducer implements VoidFunction<Tuple2<Long, Iterable<Writable>>> {
    private static final long serialVersionUID = -7149865018683261964L;

    private final String _fnameNew;
    private final int _replication;

    public DataPartitionerRemoteSparkReducer(String fnameNew, OutputInfo oi, int replication) {
        _fnameNew = fnameNew;
        _replication = replication;
    }

    @Override
    @SuppressWarnings("deprecation")
    public void call(Tuple2<Long, Iterable<Writable>> arg0) throws Exception {
        //prepare grouped partition input
        Long key = arg0._1();
        Iterator<Writable> valueList = arg0._2().iterator();

        //write entire partition to binary block sequence file
        SequenceFile.Writer writer = null;
        try {
            //create sequence file writer
            Configuration job = new Configuration(ConfigurationManager.getCachedJobConf());
            Path path = new Path(_fnameNew + File.separator + key);
            FileSystem fs = IOUtilFunctions.getFileSystem(path, job);
            writer = new SequenceFile.Writer(fs, job, path, MatrixIndexes.class, MatrixBlock.class,
                    job.getInt(MRConfigurationNames.IO_FILE_BUFFER_SIZE, 4096), (short) _replication,
                    fs.getDefaultBlockSize(), null, new SequenceFile.Metadata());

            //write individual blocks unordered to output
            while (valueList.hasNext()) {
                PairWritableBlock pair = (PairWritableBlock) valueList.next();
                writer.append(pair.indexes, pair.block);
            }
        } finally {
            IOUtilFunctions.closeSilently(writer);
        }
    }
}