| /* |
| * 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.sysds.runtime.io; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.LocalFileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.sysds.common.Types.FileFormat; |
| import org.apache.sysds.conf.DMLConfig; |
| import org.apache.sysds.hops.OptimizerUtils; |
| import org.apache.sysds.runtime.controlprogram.parfor.stat.InfrastructureAnalyzer; |
| import org.apache.sysds.runtime.data.TensorBlock; |
| import org.apache.sysds.runtime.util.CommonThreadPool; |
| import org.apache.sysds.runtime.util.HDFSTool; |
| |
| 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.Future; |
| |
| public class TensorWriterTextCellParallel extends TensorWriterTextCell { |
| @Override |
| protected void writeTextCellTensorToHDFS(Path path, FileSystem fs, TensorBlock src) throws IOException { |
| //estimate output size and number of output blocks (min 1) |
| // TODO accurate estimation |
| int numPartFiles = (int) (OptimizerUtils.estimateSizeTextOutput(src.getDims(), src.getLength(), |
| FileFormat.TEXT) / InfrastructureAnalyzer.getHDFSBlockSize()); |
| numPartFiles = Math.max(numPartFiles, 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.writeTextCellTensorToHDFS(path, fs, src); |
| return; |
| } |
| |
| //create directory for concurrent tasks |
| HDFSTool.createDirIfNotExistOnHDFS(path, DMLConfig.DEFAULT_SHARED_DIR_PERMISSION); |
| |
| //create and execute tasks |
| try { |
| ExecutorService pool = CommonThreadPool.get(numThreads); |
| ArrayList<WriteTextTask> tasks = new ArrayList<>(); |
| int rlen = src.getNumRows(); |
| int blklen = (int) Math.ceil((double) rlen / numThreads); |
| for (int i = 0; i < numThreads & i * blklen < rlen; i++) { |
| Path newPath = new Path(path, IOUtilFunctions.getPartFileName(i)); |
| tasks.add(new WriteTextTask(newPath, fs, src, i * blklen, Math.min((i + 1) * blklen, rlen))); |
| } |
| |
| //wait until all tasks have been executed |
| List<Future<Object>> rt = pool.invokeAll(tasks); |
| pool.shutdown(); |
| |
| //check for exceptions |
| for (Future<Object> task : rt) |
| task.get(); |
| |
| // delete crc files if written to local file system |
| if( fs instanceof LocalFileSystem ) { |
| for (int i = 0; i < numThreads & i * blklen < rlen; i++) |
| IOUtilFunctions.deleteCrcFilesFromLocalFileSystem(fs, |
| new Path(path, IOUtilFunctions.getPartFileName(i))); |
| } |
| } |
| catch (Exception e) { |
| throw new IOException("Failed parallel write of text output.", e); |
| } |
| } |
| |
| private static class WriteTextTask implements Callable<Object> { |
| private FileSystem _fs; |
| private TensorBlock _src; |
| private Path _path; |
| private int _rl; |
| private int _ru; |
| |
| public WriteTextTask(Path path, FileSystem fs, TensorBlock src, int rl, int ru) { |
| _path = path; |
| _fs = fs; |
| _src = src; |
| _rl = rl; |
| _ru = ru; |
| } |
| |
| @Override |
| public Object call() throws Exception { |
| writeTextCellTensorToFile(_path, _fs, _src, _rl, _ru); |
| return null; |
| } |
| } |
| } |