| /* |
| * 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.Path; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.TextInputFormat; |
| import org.apache.sysds.common.Types; |
| import org.apache.sysds.hops.OptimizerUtils; |
| import org.apache.sysds.runtime.io.IOUtilFunctions.CountRowsTask; |
| import org.apache.sysds.runtime.matrix.data.FrameBlock; |
| import org.apache.sysds.runtime.util.CommonThreadPool; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Future; |
| |
| public class FrameReaderJSONLParallel extends FrameReaderJSONL |
| { |
| @Override |
| protected void readJSONLFrameFromHDFS(Path path, JobConf jobConf, FileSystem fileSystem, |
| FrameBlock dest, Types.ValueType[] schema, Map<String, Integer> schemaMap) |
| throws IOException |
| { |
| int numThreads = OptimizerUtils.getParallelTextReadParallelism(); |
| |
| TextInputFormat inputFormat = new TextInputFormat(); |
| inputFormat.configure(jobConf); |
| InputSplit[] splits = inputFormat.getSplits(jobConf, numThreads); |
| splits = IOUtilFunctions.sortInputSplits(splits); |
| |
| try{ |
| ExecutorService executorPool = CommonThreadPool.get(Math.min(numThreads, splits.length)); |
| |
| //compute num rows per split |
| ArrayList<CountRowsTask> countRowsTasks = new ArrayList<>(); |
| for (InputSplit split : splits){ |
| countRowsTasks.add(new CountRowsTask(split, inputFormat, jobConf)); |
| } |
| List<Future<Long>> ret = executorPool.invokeAll(countRowsTasks); |
| |
| //compute row offset per split via cumsum on row counts |
| long offset = 0; |
| List<Long> offsets = new ArrayList<>(); |
| for( Future<Long> rc : ret ) { |
| offsets.add(offset); |
| offset += rc.get(); |
| } |
| |
| //read individual splits |
| ArrayList<ReadRowsTask> readRowsTasks = new ArrayList<>(); |
| for( int i=0; i<splits.length; i++ ) |
| readRowsTasks.add(new ReadRowsTask(splits[i], inputFormat, |
| jobConf, dest, schemaMap, offsets.get(i).intValue())); |
| CommonThreadPool.invokeAndShutdown(executorPool, readRowsTasks); |
| } |
| catch (Exception e) { |
| throw new IOException("Failed parallel read of JSONL input.", e); |
| } |
| } |
| |
| private class ReadRowsTask implements Callable<Object>{ |
| private InputSplit _split; |
| private TextInputFormat _inputFormat; |
| private JobConf _jobConf; |
| private FrameBlock _dest; |
| Map<String, Integer> _schemaMap; |
| private int _offset; |
| |
| public ReadRowsTask(InputSplit split, TextInputFormat inputFormat, JobConf jobConf, |
| FrameBlock dest, Map<String, Integer> schemaMap, int offset) |
| { |
| _split = split; |
| _inputFormat = inputFormat; |
| _jobConf = jobConf; |
| _dest = dest; |
| _schemaMap = schemaMap; |
| _offset = offset; |
| } |
| |
| @Override |
| public Object call() throws Exception { |
| readJSONLFrameFromInputSplit(_split, _inputFormat, _jobConf, _dest.getSchema(), _schemaMap, _dest, _offset); |
| return null; |
| } |
| } |
| } |