| /* |
| * 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 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; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.sysds.hops.OptimizerUtils; |
| import org.apache.sysds.runtime.DMLRuntimeException; |
| import org.apache.sysds.runtime.matrix.data.FrameBlock; |
| import org.apache.sysds.runtime.util.CommonThreadPool; |
| |
| |
| /** |
| * Multi-threaded frame binary block reader. |
| * |
| */ |
| public class FrameReaderBinaryBlockParallel extends FrameReaderBinaryBlock |
| { |
| @Override |
| protected void readBinaryBlockFrameFromHDFS( Path path, JobConf job, FileSystem fs, FrameBlock dest, long rlen, long clen ) |
| throws IOException, DMLRuntimeException |
| { |
| int numThreads = OptimizerUtils.getParallelBinaryReadParallelism(); |
| |
| try |
| { |
| //create read tasks for all files |
| ExecutorService pool = CommonThreadPool.get(numThreads); |
| ArrayList<ReadFileTask> tasks = new ArrayList<>(); |
| for( Path lpath : IOUtilFunctions.getSequenceFilePaths(fs, path) ) |
| tasks.add(new ReadFileTask(lpath, job, fs, dest)); |
| |
| //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(); |
| } |
| catch (Exception e) { |
| throw new IOException("Failed parallel read of binary block input.", e); |
| } |
| } |
| |
| private class ReadFileTask implements Callable<Object> |
| { |
| private Path _path = null; |
| private JobConf _job = null; |
| private FileSystem _fs = null; |
| private FrameBlock _dest = null; |
| |
| public ReadFileTask(Path path, JobConf job, FileSystem fs, FrameBlock dest) { |
| _path = path; |
| _fs = fs; |
| _job = job; |
| _dest = dest; |
| } |
| |
| @Override |
| public Object call() throws Exception { |
| readBinaryBlockFrameFromSequenceFile(_path, _job, _fs, _dest); |
| return null; |
| } |
| } |
| } |