| /* |
| * 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.FileInputFormat; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.TextInputFormat; |
| import org.apache.sysds.hops.OptimizerUtils; |
| import org.apache.sysds.common.Types.ValueType; |
| import org.apache.sysds.runtime.matrix.data.FrameBlock; |
| import org.apache.sysds.runtime.util.CommonThreadPool; |
| |
| /** |
| * Multi-threaded frame textcell reader. |
| * |
| */ |
| public class FrameReaderTextCellParallel extends FrameReaderTextCell |
| { |
| |
| @Override |
| protected void readTextCellFrameFromHDFS( Path path, JobConf job, FileSystem fs, FrameBlock dest, |
| ValueType[] schema, String[] names, long rlen, long clen) |
| throws IOException |
| { |
| int numThreads = OptimizerUtils.getParallelTextReadParallelism(); |
| |
| FileInputFormat.addInputPath(job, path); |
| TextInputFormat informat = new TextInputFormat(); |
| informat.configure(job); |
| |
| try |
| { |
| //create read tasks for all splits |
| ExecutorService pool = CommonThreadPool.get(numThreads); |
| InputSplit[] splits = informat.getSplits(job, numThreads); |
| ArrayList<ReadTask> tasks = new ArrayList<>(); |
| for( InputSplit split : splits ) |
| tasks.add(new ReadTask(split, informat, job, 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 text cell input.", e); |
| } |
| } |
| |
| public class ReadTask implements Callable<Object> |
| { |
| private InputSplit _split = null; |
| private TextInputFormat _informat = null; |
| private JobConf _job = null; |
| private FrameBlock _dest = null; |
| |
| public ReadTask( InputSplit split, TextInputFormat informat, JobConf job, FrameBlock dest ) { |
| _split = split; |
| _informat = informat; |
| _job = job; |
| _dest = dest; |
| } |
| |
| @Override |
| public Object call() throws Exception { |
| readTextCellFrameFromInputSplit(_split, _informat, _job, _dest); |
| return null; |
| } |
| } |
| } |