| /* |
| * 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.Path; |
| import org.apache.hadoop.io.LongWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.FileInputFormat; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordReader; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.mapred.TextInputFormat; |
| import org.apache.sysds.common.Types; |
| import org.apache.sysds.hops.OptimizerUtils; |
| import org.apache.sysds.runtime.data.TensorBlock; |
| import org.apache.sysds.runtime.util.CommonThreadPool; |
| import org.apache.sysds.runtime.util.FastStringTokenizer; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Future; |
| import java.util.stream.Collectors; |
| |
| public class TensorReaderTextCellParallel extends TensorReaderTextCell { |
| private int _numThreads = OptimizerUtils.getParallelTextReadParallelism(); |
| |
| @Override |
| protected TensorBlock readTextCellTensorFromHDFS(Path path, JobConf job, long[] dims, |
| Types.ValueType[] schema) throws IOException { |
| FileInputFormat.addInputPath(job, path); |
| TextInputFormat informat = new TextInputFormat(); |
| informat.configure(job); |
| |
| int[] idims = Arrays.stream(dims).mapToInt(i -> (int) i).toArray(); |
| TensorBlock ret; |
| if( schema.length == 1 ) |
| ret = new TensorBlock(schema[0], idims).allocateBlock(); |
| else |
| ret = new TensorBlock(schema, idims).allocateBlock(); |
| try { |
| ExecutorService pool = CommonThreadPool.get(_numThreads); |
| InputSplit[] splits = informat.getSplits(job, _numThreads); |
| |
| //create and execute read tasks for all splits |
| List<TensorReaderTextCellParallel.ReadTask> tasks = Arrays.stream(splits) |
| .map(s -> new TensorReaderTextCellParallel.ReadTask(s, informat, job, ret)) |
| .collect(Collectors.toList()); |
| List<Future<Object>> rt = pool.invokeAll(tasks); |
| |
| //check for exceptions |
| for (Future<Object> task : rt) |
| task.get(); |
| |
| pool.shutdown(); |
| } |
| catch (Exception e) { |
| throw new IOException("Threadpool issue, while parallel read.", e); |
| } |
| return ret; |
| } |
| |
| private static class ReadTask implements Callable<Object> { |
| private final InputSplit _split; |
| private final TextInputFormat _informat; |
| private final JobConf _job; |
| private final TensorBlock _dest; |
| |
| public ReadTask(InputSplit split, TextInputFormat informat, JobConf job, TensorBlock dest) { |
| _split = split; |
| _informat = informat; |
| _job = job; |
| _dest = dest; |
| } |
| |
| @Override |
| public Object call() throws Exception { |
| LongWritable key = new LongWritable(); |
| Text value = new Text(); |
| try { |
| FastStringTokenizer st = new FastStringTokenizer(' '); |
| |
| int[] ix = new int[_dest.getNumDims()]; |
| RecordReader<LongWritable, Text> reader = _informat.getRecordReader(_split, _job, Reporter.NULL); |
| try { |
| while (reader.next(key, value)) { |
| st.reset(value.toString()); |
| for (int i = 0; i < ix.length; i++) { |
| ix[i] = st.nextInt() - 1; |
| } |
| _dest.set(ix, st.nextToken()); |
| } |
| } |
| finally { |
| IOUtilFunctions.closeSilently(reader); |
| } |
| } |
| catch (Exception ex) { |
| throw new IOException("Unable to read tensor in text cell format.", ex); |
| } |
| return null; |
| } |
| } |
| } |