org.apache.sysml.runtime.io.FrameWriterTextCSVParallel Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of systemml Show documentation
Declarative Machine Learning
There is a newer version: 1.2.0
/*
 * 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.io;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobConf;
import org.apache.sysml.conf.DMLConfig;
import org.apache.sysml.hops.OptimizerUtils;
import org.apache.sysml.runtime.controlprogram.parfor.stat.InfrastructureAnalyzer;
import org.apache.sysml.runtime.matrix.data.CSVFileFormatProperties;
import org.apache.sysml.runtime.matrix.data.FrameBlock;
import org.apache.sysml.runtime.matrix.data.OutputInfo;
import org.apache.sysml.runtime.util.MapReduceTool;

/**
 * Single-threaded frame text csv writer.
 * 
 */
public class FrameWriterTextCSVParallel extends FrameWriterTextCSV
{
	public FrameWriterTextCSVParallel( CSVFileFormatProperties props ) {
		super(props);
	}

	@Override
	protected void writeCSVFrameToHDFS( Path path, JobConf job, FrameBlock src, long rlen, long clen, CSVFileFormatProperties csvprops ) 
		throws IOException
	{
		//estimate output size and number of output blocks (min 1)
		int numPartFiles = Math.max((int)(OptimizerUtils.estimateSizeTextOutput(rlen, clen, rlen*clen, 
				              OutputInfo.CSVOutputInfo)  / InfrastructureAnalyzer.getHDFSBlockSize()), 1);
		
		//determine degree of parallelism
		int numThreads = OptimizerUtils.getParallelTextWriteParallelism();
		numThreads = Math.min(numThreads, numPartFiles);
		
		//fall back to sequential write if dop is 1 (e.g., <128MB) in order to create single file
		if( numThreads <= 1 ) {
			super.writeCSVFrameToHDFS(path, job, src, rlen, clen, csvprops);
			return;
		}
		
		//create directory for concurrent tasks
		MapReduceTool.createDirIfNotExistOnHDFS(path.toString(), DMLConfig.DEFAULT_SHARED_DIR_PERMISSION);
		FileSystem fs = FileSystem.get(job);
		
		//create and execute tasks
		try 
		{
			ExecutorService pool = Executors.newFixedThreadPool(numThreads);
			ArrayList tasks = new ArrayList();
			int blklen = (int)Math.ceil((double)rlen / numThreads);
			for(int i=0; i> rt = pool.invokeAll(tasks);	
			pool.shutdown();
			
			//check for exceptions 
			for( Future